Commercial Truck Emissions Repair
Commercial Truck Emissions Repair That Restores Performance & Eliminates Derates
Professional DPF diagnostics, DEF system repairs, SCR service, EGR repairs, forced regenerations, and complete aftertreatment diagnostics for commercial trucks and fleets.
(409) 752-5400CRANETEC Commercial Truck Emissions Repair
What commercial truck emissions repair services does CRANETEC provide?
CRANETEC provides commercial truck emissions repair including complete emissions diagnostics, DPF diagnostics, cleaning, and replacement, forced regeneration, DEF system diagnostics, DEF pump and injector replacement, SCR system and catalyst repair, NOx and temperature sensor replacement, EGR valve and cooler repair, aftertreatment system repair, and fleet emissions maintenance. Experienced diesel technicians, OEM-level diagnostic tools, and quality components reduce downtime, restore performance, and keep fleets emissions compliant across Texas, Louisiana, Florida, and North Carolina. See our Heavy-Duty Truck Repair hub for the full service cluster.
Graphic Placeholder
Heavy Duty Aftertreatment System
Labeled diagram of a commercial diesel aftertreatment system — DPF, DEF injector, SCR catalyst, NOx sensors, and EGR system.
Introduction
Modern Diesel Emissions Systems Are Essential — and Complex
Every modern commercial diesel truck depends on an aftertreatment system — the DPF, DEF system, SCR catalyst, EGR system, and the sensors and control module that manage them — to meet EPA emissions standards. These systems are engineered to reduce harmful exhaust emissions while maintaining engine performance, and they are now a core part of how a commercial truck operates every mile.
When an emissions component fails, the consequences escalate quickly. A warning light becomes frequent regeneration, frequent regeneration becomes a restricted DPF, and a restricted DPF becomes an engine derate that limits power and speed. Left unresolved, the truck is sidelined — costing revenue, disrupting schedules, and risking a roadside inspection violation. Emissions failures are one of the most common and costly sources of unplanned downtime in a modern diesel fleet.
The key to affordable emissions repair is accurate diagnostics. Aftertreatment systems are interdependent — a NOx sensor fault can look like an SCR catalyst failure, and a DEF quality issue can look like a pump failure. Replacing parts without diagnosing the root cause is expensive and often fails again. CRANETEC uses OEM-level diagnostic tools and live data to find the true fault before recommending any parts.
Preventive maintenance is the most effective way to reduce aftertreatment failures. Scheduled DPF inspections, DEF quality testing, sensor checks, and regeneration monitoring catch faults early — when repair is inexpensive and the truck stays on the road. CRANETEC helps commercial fleets maximize uptime through expert emissions diagnostics, repairs, forced regenerations, and scheduled maintenance programs. See our broader Heavy-Duty Truck Repair and Preventive Maintenance resources.
Engine Derates
An unaddressed emissions fault limits power and speed, sidelining the truck.
Higher Fuel Costs
A restricted DPF and frequent regenerations burn more fuel every mile.
EPA Compliance
A functioning aftertreatment system is required to pass inspections.
Lost Productivity
Emissions downtime costs revenue and disrupts customer schedules.
Why Commercial Emissions Repair Matters
Why Commercial Emissions Repair Matters
Emissions health directly affects power, fuel economy, compliance, and uptime for every commercial truck.
Preventing Engine Derates
Early diagnosis and repair clear faults before the ECM limits power and forces a derate.
Fleet Uptime
Functional emissions systems keep every truck available and on schedule.
EPA Compliance
A working aftertreatment system is required to meet emissions regulations and pass inspections.
Reduced Downtime
Planned emissions maintenance replaces roadside failures with scheduled shop visits.
Lower Operating Costs
Accurate diagnostics and preventive care lower cost per mile over the unit’s life.
Improved Fuel Efficiency
A clean DPF and efficient SCR restore fuel economy lost to backpressure and frequent regens.
Longer Aftertreatment Life
Proper maintenance extends DPF, DEF, SCR, and EGR component life.
Business Continuity
Fewer derates and breakdowns keep your operation and your customers moving.
Fleet Productivity
Trucks at full power generate revenue; derated trucks do not.
Preventive Maintenance
Scheduled emissions care prevents the failures that cause downtime.
Return on Investment
Every dollar of preventive emissions maintenance returns multiple in avoided breakdowns.
Equipment Reliability
Maintained aftertreatment systems perform reliably across the fleet.
Emergency Repair Advice
Never ignore an engine derate or an emissions warning light. A derate is the truck protecting itself because an emissions fault was not addressed, and it will get worse — not better — if ignored. A truck driven in derate risks a roadside breakdown, a tow, and an inspection violation. Diagnose and repair the root cause as soon as the warning appears.
Commercial Equipment We Service
Commercial Equipment We Service
From Class 5 medium-duty to Class 8 heavy-haul, CRANETEC services emissions systems across every commercial truck class.
Class 5 Trucks
Typical applications: Medium-duty box, delivery, landscape
Common emissions concerns: DPF loading, EGR soot, regen frequency on shorter routes
Learn MoreClass 6 Trucks
Typical applications: Medium-duty vocational, refrigerated, rack
Common emissions concerns: DEF quality, NOx sensor drift, frequent regen
Learn MoreClass 7 Trucks
Typical applications: Heavy vocational, refuse, construction
Common emissions concerns: Severe-service DPF loading, EGR cooler failures
Learn MoreClass 8 Trucks
Typical applications: Line-haul, heavy vocational, dump
Common emissions concerns: DPF restriction, SCR efficiency faults, derates
Learn MoreSemi Trucks
Typical applications: Line-haul tractors, over-the-road
Common emissions concerns: DPF load, NOx sensors, DEF dosing, regen cycles
Learn MoreDay Cabs
Typical applications: Regional hauling, local delivery
Common emissions concerns: Short-cycle regen frequency, DPF soot accumulation
Learn MoreSleeper Trucks
Typical applications: Long-haul, cross-country
Common emissions concerns: High-mileage DPF ash load, DEF system reliability
Learn MoreDump Trucks
Typical applications: Construction, hauling, vocational
Common emissions concerns: Severe-service DPF clogging, EGR soot, heat
Learn MoreBucket Trucks
Typical applications: Utility, telecom, line work
Common emissions concerns: Idle-heavy DPF loading, regen issues
Learn MoreService Trucks
Typical applications: Field service, mobile repair
Common emissions concerns: Idle time, short trips, DPF restriction
Learn MoreUtility Trucks
Typical applications: Electric, water, gas utility work
Common emissions concerns: Idle-heavy soot, EGR buildup, DPF loading
Learn MoreConstruction Equipment
Typical applications: Job-site diesel equipment
Common emissions concerns: Severe-service DPF, EGR, high soot output
Learn MoreBoom Trucks
Typical applications: Crane and lift operations
Common emissions concerns: Idle and PTO operation affecting DPF regen
Learn MoreMunicipal Vehicles
Typical applications: Public works, refuse, utility
Common emissions concerns: Stop-and-go DPF loading, EGR soot, compliance
Learn MoreVocational Trucks
Typical applications: Mixers, pumps, winch, vacuum
Common emissions concerns: Severe-duty DPF and EGR wear, regen faults
Learn MoreCommercial Trailers
Typical applications: Aftertreatment-equipped support units
Common emissions concerns: Reefer DEF systems, support-unit emissions
Learn MoreGraphic Placeholder
DPF Operation Diagram
Diagram showing how a DPF traps soot, regenerates to burn soot to ash, and reports load via the pressure sensor.
Emissions Systems We Service
Emissions Systems We Service
Every major component of the modern diesel aftertreatment system — diagnosed, repaired, and maintained by experienced diesel technicians.
Diesel Particulate Filters (DPF)
Typical applicationsTraps soot and ash from diesel exhaust on all modern trucks
Common failuresRestriction, clogging, cracked substrate, failed regeneration
Diagnostic methodologySoot and ash load, pressure sensor data, regen history, inspection
Preventive maintenanceScheduled inspection, off-vehicle cleaning at ash limit, root-cause repair
Fleet benefit: Restores flow, prevents derate, extends filter life
Diesel Exhaust Fluid (DEF) Systems
Typical applicationsDoses DEF to reduce NOx across the SCR catalyst
Common failuresLow quality, pump failure, injector clog, line crystallization
Diagnostic methodologyFluid quality test, pressure and flow, dosing verification, codes
Preventive maintenanceQuality testing, filter service, line inspection, correct fluid
Fleet benefit: Reliable dosing, avoids SCR faults and derates
SCR Systems
Typical applicationsCatalytic conversion of NOx using DEF
Common failuresEfficiency fault, catalyst degradation, dosing errors
Diagnostic methodologyUpstream/downstream NOx comparison, dosing, leak check
Preventive maintenanceDEF quality, dosing inspection, sensor monitoring
Fleet benefit: NOx conversion restored, compliance maintained
EGR Systems
Typical applicationsRecirculates exhaust to lower combustion temperature
Common failuresStuck valve, clogged cooler, soot buildup, leaks
Diagnostic methodologyValve command and position, cooler pressure test, inspection
Preventive maintenanceValve and cooler inspection, soot cleaning, sensor checks
Fleet benefit: Restores performance, reduces NOx, prevents faults
NOx Sensors
Typical applicationsMeasure NOx before and after the SCR catalyst
Common failuresContamination, drift, electrical fault, age
Diagnostic methodologySensor comparison, response testing, circuit check
Preventive maintenanceInspection at PM, trend monitoring, replacement on failure
Fleet benefit: Accurate dosing, no false SCR faults or derates
DEF Pumps
Typical applicationsDeliver DEF from tank to injector at correct pressure
Common failuresContamination, crystallization, electrical, wear
Diagnostic methodologyPressure codes, line inspection, pump circuit test
Preventive maintenanceQuality fluid, filter service, line inspection
Fleet benefit: Consistent DEF delivery, no dosing faults
DEF Injectors
Typical applicationsMeter DEF into the exhaust upstream of SCR
Common failuresCrystallization, contamination, electrical, wear
Diagnostic methodologyDosing command, measurement, crystallization inspection
Preventive maintenanceQuality fluid, injector inspection, dosing verification
Fleet benefit: Correct DEF dosing, SCR efficiency restored
DPF Differential Pressure Sensors
Typical applicationsMeasure pressure drop across the DPF to infer soot load
Common failuresSoot contamination, electrical fault, drift
Diagnostic methodologyPressure reading vs known load, circuit test
Preventive maintenanceInspection at PM, replacement on failure
Fleet benefit: Accurate soot-load data, correct regen timing
Exhaust Temperature Sensors
Typical applicationsMonitor exhaust temperature for regeneration control
Common failuresHeat damage, drift, electrical fault
Diagnostic methodologyTemperature comparison, response test, circuit
Preventive maintenanceInspection at PM, replacement on failure
Fleet benefit: Proper regen control, no failed regens
Aftertreatment Control Modules
Typical applicationsManage the entire emissions system logic
Common failuresSoftware fault, electrical, communication errors
Diagnostic methodologyCode scan, module diagnostics, software check
Preventive maintenanceSoftware updates, diagnostic scans at PM
Fleet benefit: Correct system operation, fewer false faults
Emission Wiring Harnesses
Typical applicationsConnect sensors, valves, and modules to the ECM
Common failuresChafing, heat damage, corrosion, broken pins
Diagnostic methodologyVisual inspection, continuity, wiggle test
Preventive maintenanceHarness inspection at PM, routing checks
Fleet benefit: Reliable signals, no intermittent faults
Regeneration Systems
Typical applicationsBurn soot from the DPF through active and passive regen
Common failuresFailed regen, incomplete regen, frequent regen
Diagnostic methodologyRegen history, temperature data, sensor checks
Preventive maintenanceMonitoring, DPF load tracking, root-cause repair
Fleet benefit: Clean filter, restored flow, no derate
Graphic Placeholder
DEF System Flow
Diagram of DEF flow from tank through pump and injector into the exhaust upstream of the SCR catalyst.
Emissions Maintenance Reminder
DEF quality is one of the most overlooked causes of emissions failures. Contaminated or degraded DEF damages the pump, injector, and catalyst — and triggers derates. Test DEF quality at every PM and always fill with certified, fresh DEF stored at the correct temperature.
Complete Emissions Repair Services
Complete Emissions Repair Services
Tap any service to see warning signs, fleet impact, and preventive recommendations.
DPF light or engine derate? Get professional emissions diagnostics before it sidelines your truck.
Graphic Placeholder
SCR System Overview
Visual of the SCR system — DEF dosing, catalyst, and upstream and downstream NOx sensors.
Common Emissions System Problems
Common Emissions System Problems
Recognizing the symptom early prevents the derate or breakdown that follows.
Engine Derate
Symptoms: Reduced power, speed limit, derate warning
Likely causes: DPF restriction, DEF fault, NOx sensor, EGR, SCR fault
Business impact: Truck cannot maintain speed
Recommended repair: Root-cause diagnostics and repair of the triggering fault
Fleet impact: Schedules disrupted
Schedule DiagnosticsCheck Engine Light
Symptoms: Illuminated MIL, stored emissions codes
Likely causes: Any aftertreatment sensor or component fault
Business impact: Risk of escalation to derate
Recommended repair: Code scan and root-cause diagnostics
Fleet impact: Indicates needed service
Schedule DiagnosticsDPF Full Warning
Symptoms: DPF warning, rising soot load
Likely causes: Soot accumulation, failed regen, sensor fault
Business impact: Will progress to derate
Recommended repair: Forced regen, cleaning, or sensor repair
Fleet impact: Address immediately
Schedule DiagnosticsFrequent Regeneration
Symptoms: Regen cycles more often than normal
Likely causes: Short trips, idling, bad sensor, engine fault
Business impact: Extra fuel burn, lost time
Recommended repair: Diagnose root cause of high soot output
Fleet impact: Higher operating cost
Schedule DiagnosticsFailed Regeneration
Symptoms: Regen does not complete, persistent warning
Likely causes: Temperature sensor, dosing, DPF condition
Business impact: Continued restriction, derate risk
Recommended repair: Diagnose regen failure cause and repair
Fleet impact: Truck at risk of derate
Schedule DiagnosticsDEF Quality Warning
Symptoms: DEF quality warning light
Likely causes: Contaminated or degraded DEF, quality sensor
Business impact: Escalates to derate if ignored
Recommended repair: Test fluid quality, replace fluid or sensor
Fleet impact: Top up with correct DEF
Schedule DiagnosticsDEF System Failure
Symptoms: DEF system fault, no dosing
Likely causes: Pump, injector, line, or module fault
Business impact: SCR fault and derate
Recommended repair: DEF system diagnostics and component repair
Fleet impact: Immediate service needed
Schedule DiagnosticsLow DEF Pressure
Symptoms: Low DEF pressure warning
Likely causes: Pump failure, line restriction, crystallization
Business impact: Dosing fault, SCR fault
Recommended repair: Pressure test, line inspection, pump service
Fleet impact: Truck cannot dose DEF
Schedule DiagnosticsSCR Efficiency Fault
Symptoms: SCR efficiency code, derate
Likely causes: DEF dosing, NOx sensor, exhaust leak, catalyst
Business impact: Forced derate
Recommended repair: NOx comparison, dosing, leak, catalyst test
Fleet impact: Priority repair
Schedule DiagnosticsNOx Sensor Failure
Symptoms: False SCR fault, incorrect dosing
Likely causes: Contamination, drift, electrical, age
Business impact: False derates, poor dosing
Recommended repair: Sensor comparison test and replacement
Fleet impact: Repeat false codes
Schedule DiagnosticsEGR Valve Failure
Symptoms: Rough idle, smoke, power loss
Likely causes: Soot buildup, sticking, electrical fault
Business impact: Performance loss, NOx
Recommended repair: Clean or replace EGR valve
Fleet impact: Reduced performance
Schedule DiagnosticsEGR Cooler Failure
Symptoms: Coolant loss, white smoke
Likely causes: Internal leak, clogging, heat damage
Business impact: Coolant ingestion, engine risk
Recommended repair: Pressure test and cooler replacement
Fleet impact: Engine damage risk
Schedule DiagnosticsExhaust Temperature Sensor Failure
Symptoms: Failed or incomplete regen
Likely causes: Heat damage, drift, electrical fault
Business impact: Regen cannot complete
Recommended repair: Sensor test and replacement
Fleet impact: DPF restriction risk
Schedule DiagnosticsDPF Pressure Sensor Failure
Symptoms: False DPF warning, incorrect load
Likely causes: Soot contamination, drift, electrical
Business impact: Incorrect regen timing
Recommended repair: Sensor test and replacement
Fleet impact: False warnings
Schedule DiagnosticsPoor Fuel Economy
Symptoms: Lower MPG than normal
Likely causes: DPF restriction, EGR fault, frequent regen
Business impact: Higher fuel cost
Recommended repair: Diagnose and repair emissions root cause
Fleet impact: Higher cost per mile
Schedule DiagnosticsLoss of Power
Symptoms: Sluggish, will not pull grade
Likely causes: Derate, DPF restriction, EGR fault
Business impact: Cannot maintain speed
Recommended repair: Diagnose derate or restriction cause
Fleet impact: Schedule disruption
Schedule DiagnosticsBlack Smoke
Symptoms: Excessive black exhaust smoke
Likely causes: EGR fault, overfueling, turbo, DPF
Business impact: Inspection violation risk
Recommended repair: Diagnose source of excess soot
Fleet impact: Compliance risk
Schedule DiagnosticsWhite Smoke
Symptoms: White exhaust smoke
Likely causes: Coolant ingestion, EGR cooler leak, fuel
Business impact: Engine damage risk
Recommended repair: Diagnose coolant or fuel source
Fleet impact: Engine damage risk
Schedule DiagnosticsEmission Fault Codes
Symptoms: Stored or active emissions codes
Likely causes: Any aftertreatment component or sensor
Business impact: Varies by code
Recommended repair: Code diagnostics and root-cause repair
Fleet impact: Needs diagnosis
Schedule DiagnosticsAftertreatment Shutdown
Symptoms: Engine shutdown to protect system
Likely causes: Severe unresolved emissions fault
Business impact: Complete breakdown
Recommended repair: Emergency emissions diagnostics and repair
Fleet impact: Roadside breakdown
Schedule DiagnosticsHeavy-Duty Technician Recommendation
Emissions systems are interdependent. A NOx sensor fault can look like an SCR catalyst failure, and a DEF quality issue can look like a pump failure. Always diagnose with live data and sensor comparison before replacing expensive parts — guessing is the most expensive way to repair emissions systems.
Why Choose CRANETEC
Why Choose CRANETEC
A commercial-only emissions repair partner focused on diagnostics, uptime, and long-term fleet value.
Commercial Emissions Specialists
Our focus is commercial diesel aftertreatment systems, not light-duty or general repair.
Advanced OEM-Level Diagnostics
OEM scan tools and live data find the true root cause before any parts are replaced.
Experienced Diesel Technicians
Trained on Cummins, Detroit, PACCAR, Volvo, and Mack aftertreatment systems.
Commercial Fleet Expertise
We understand fleet duty cycles, uptime, and cost per mile, not just single repairs.
Aftertreatment Specialists
DPF, DEF, SCR, EGR, and sensors — diagnosed, repaired, and maintained by specialists.
Fast Turnaround
Same-day service for most emissions repairs; derated trucks prioritized.
Commercial-Only Repair Focus
Our shop and tools are set up for heavy-duty commercial trucks and fleets.
Priority Fleet Scheduling
Fleet customers get priority scheduling for every unit.
Digital Inspections
Documented findings, photos, and recommendations for every truck.
Preventive Maintenance Planning
We plan emissions maintenance to prevent failures before they happen.
Transparent Communication
Clear estimates, updates, and reporting — no surprises on the invoice.
Long-Term Fleet Partnerships
We build relationships that lower cost per mile over the life of the fleet.
EPA Compliance Expertise
We keep aftertreatment systems functional and fleets inspection-ready.
Our Emissions Repair Process
Our Emissions Repair Process
A systematic, diagnostic-first process that fixes the root cause and verifies the repair.
Schedule Service
Call or submit the form. We gather truck details and symptoms and schedule your repair or diagnostic.
Vehicle Inspection
A visual inspection of the aftertreatment system, wiring, and components confirms the reported symptoms.
Computer Diagnostics
OEM-level scan tools read fault codes, freeze-frame data, and live sensor values.
Aftertreatment System Testing
DPF load, DEF quality and dosing, NOx comparison, EGR function, and regen history are tested.
Root Cause Analysis
We trace the fault to its true root cause — not just the first failed sensor or code.
Repair Estimate
You receive a clear, itemized estimate before any repair work begins.
Professional Repairs
Experienced technicians perform the repair using quality components and correct procedures.
Forced Regeneration & Verification
A forced regen and system verification confirm the repair restored full function and cleared the derate.
Return To Service
The truck returns to full power, emissions compliant, and ready for the road.
Graphic Placeholder
Regeneration Process
Visual showing passive, active, and forced regeneration cycles and how soot is burned from the DPF.
Regeneration Tip
Frequent regeneration is a symptom, not a diagnosis. If a truck is regenerating more often than normal, something is causing high soot output or preventing a complete regen — short trips, idling, a bad sensor, or an engine fault. Diagnose the cause rather than simply repeating forced regens, which wastes fuel and does not fix the root problem.
Preventive Emissions Maintenance
Preventive Emissions Maintenance
The most reliable way to prevent derates and extend aftertreatment life. Connects to our Fleet Maintenance programs.
Routine Diagnostic Scans
Full fault-code scan at every PM catches faults before they trigger a derate.
DPF Inspections
Soot and ash load monitored so cleaning is scheduled before restriction.
DEF Quality Testing
Fluid quality checked at every PM to protect the pump, injector, and catalyst.
DEF Filter Replacement
Filters replaced on the service interval to prevent dosing failures.
NOx Sensor Inspections
Sensor trends monitored to catch drift before it causes a false derate.
EGR Inspections
Valve and cooler inspected for soot and leaks at scheduled intervals.
Aftertreatment Inspections
Complete system inspection verifies every component is functioning.
Regeneration Monitoring
Regen history tracked to detect frequent or failed regens early.
Software Updates
Module software kept current to prevent software-related emissions faults.
Fleet Reporting
Documented findings and recommendations for every unit, every PM.
Maintenance Forecasting
Trend data predicts which truck will need service next.
Repair History
Tracked maintenance history supports compliance and lifecycle decisions.
Downtime Prevention
Early detection moves repair from emergency to planned service.
Cost Reduction
Preventive emissions maintenance lowers cost per mile and total cost of ownership.
Longer Emissions System Life
Maintained DPF, DEF, SCR, and EGR components run for their full design life.
Graphic Placeholder
Fleet Emissions Maintenance Timeline
Timeline showing scheduled diagnostic scans, DPF cleaning, DEF service, and sensor checks across a fleet lifecycle.
Preventive Maintenance Reminder
Schedule DPF cleaning by ash load and mileage, not just when a warning appears. Once a DPF is restricted enough to derate the truck, cleaning may no longer be enough and replacement becomes the only option. Cleaning early — before restriction — extends filter life and avoids a costly replacement.
Emergency Emissions Repair
Emergency Emissions Repair
When a truck is derated, every minute counts. CRANETEC prioritizes emergency emissions repair to restore full power fast.
Engine Derates
A derated truck cannot maintain speed — we diagnose and clear the derate fast.
Unexpected Shutdowns
An aftertreatment shutdown leaves the truck on the shoulder — priority repair gets it moving.
Emission Warning Lights
An active warning can escalate to a derate — we diagnose and repair before it does.
Fleet Emergencies
Multiple derated trucks disrupt the whole fleet — we prioritize the whole fleet.
Priority Diagnostics
OEM-level diagnostics on the front of the line find the fault fast.
Rapid Turnaround
Stocked common sensors and organized diagnostics minimize downtime.
Commercial Fleet Support
We support both single trucks and large fleets in an emergency.
Downtime Reduction
Every minute a derated truck sits costs revenue — we get it back to work.
Engine Derated? Call CRANETEC Immediately
Fleet Emissions Maintenance Programs
Fleet Emissions Maintenance Programs
Programs that lower cost per mile, reduce derates, and keep every unit emissions compliant.
Scheduled Diagnostics
Every unit scanned on a regular cadence across the fleet.
Preventive Maintenance
Scheduled emissions service prevents derates and failures.
DPF Cleaning Schedules
Cleaning scheduled by ash load to prevent restriction.
DEF System Inspections
Quality, pump, injector, and dosing checked at every PM.
Fleet Reporting
Documented findings and recommendations for every unit.
Repair Tracking
Every emissions repair documented for each asset.
Digital Maintenance Records
Clear, documented reports ready for management and DOT.
Maintenance Forecasting
Trend data predicts the next service need before failure.
Priority Scheduling
Fleet customers get priority scheduling for every unit.
EPA Compliance
Scheduled inspections keep every unit compliant and ready.
Fleet Lifecycle Planning
Inspection history informs repair-versus-replace decisions.
Commercial Fleet Partnerships
We build long-term relationships that keep fleets running.
Industries We Serve
Industries We Serve
Each industry has distinct equipment and duty cycles that affect emissions system wear.
Transportation Companies
Typical equipment: Semi tractors, line-haul trucks
Most common emissions issues: DPF load, NOx sensors, DEF dosing, high-mileage ash
Recommended strategy: Scheduled DPF and sensor PM with regen monitoring
Business benefits: Lower cost per mile and fewer derates
Logistics Providers
Typical equipment: Regional and line-haul tractors
Most common emissions issues: High-mileage DPF ash, DEF system reliability
Recommended strategy: Fleet program with priority scheduling and reporting
Business benefits: Reliable delivery schedules and predictable cost
Construction Contractors
Typical equipment: Dump trucks, vocational, service trucks
Most common emissions issues: Severe-service DPF clogging, EGR soot, frequent regen
Recommended strategy: Severe-service intervals and DPF cleaning schedules
Business benefits: Keeps job-site equipment at full power
Utility Contractors
Typical equipment: Bucket trucks, utility trucks
Most common emissions issues: Idle-heavy DPF loading, regen frequency
Recommended strategy: Scheduled emissions PM with regen monitoring
Business benefits: Reliable lift and bucket operation
Telecommunications Contractors
Typical equipment: Bucket trucks, cable placers
Most common emissions issues: Idle-heavy soot, DPF restriction, EGR buildup
Recommended strategy: Scheduled emissions service for idle-heavy duty
Business benefits: Reliable fleet for fiber and telecom work
Municipal Fleets
Typical equipment: Utility, refuse, service trucks
Most common emissions issues: Stop-and-go DPF loading, EGR soot, compliance
Recommended strategy: Documented PM with digital records for audits
Business benefits: Compliant, reliable public works fleet
Government Agencies
Typical equipment: Mixed commercial fleet
Most common emissions issues: Diverse aftertreatment systems, compliance focus
Recommended strategy: Standardized PM and documented reporting
Business benefits: EPA-ready fleet with audit-ready records
Oil & Gas Companies
Typical equipment: Vocational and heavy-haul trucks
Most common emissions issues: Severe-service DPF and EGR wear, frequent regen
Recommended strategy: Severe-service PM with DPF load monitoring
Business benefits: Reliable operation in demanding conditions
Heavy Equipment Contractors
Typical equipment: Vocational trucks, construction equipment
Most common emissions issues: Heavy soot output, DPF restriction, EGR
Recommended strategy: Severe-service intervals and component inspection
Business benefits: Protected equipment and lower downtime
Rental Equipment Companies
Typical equipment: Rented trucks and equipment
Most common emissions issues: Wear from varied operators, unknown history
Recommended strategy: Inspection and emissions service between rentals
Business benefits: Reliable fleet and protected rental assets
Featured Case Studies
Real Emissions Repair Results
Representative DPF, DEF, SCR, derate, and preventive emissions outcomes.
Fleet DPF Cleaning Program
Challenge: A regional fleet faced repeated DPF derates and unplanned cleaning across many units.
Diagnostic findings: Inspection found rising ash load on several trucks and no scheduled cleaning program.
Repair summary: A fleet-wide DPF inspection and scheduled off-vehicle cleaning program was implemented.
Business results: Derates eliminated and DPF life extended across the fleet with predictable maintenance.
Read Full Case Study
Engine Derate Resolution
Challenge: A line-haul tractor was derated on the road and could not maintain highway speed.
Diagnostic findings: Diagnostics found a failed NOx sensor triggering a false SCR efficiency derate.
Repair summary: NOx sensor replacement, system verification, and forced regeneration.
Business results: Derate cleared and full power restored the same day with no unnecessary parts.
Read Full Case Study
DEF System Restoration
Challenge: A vocational fleet reported DEF warnings and dosing faults on several trucks.
Diagnostic findings: Diagnostics found contaminated DEF and a crystallized dosing injector on the worst unit.
Repair summary: DEF tank service, line flushing, injector replacement, and quality fluid refill.
Business results: DEF system restored, SCR faults cleared, and a quality-fluid program prevents recurrence.
Read Full Case Study
SCR System Repair
Challenge: A semi tractor had a persistent SCR efficiency fault and recurring derate.
Diagnostic findings: NOx comparison confirmed dosing was correct; an exhaust leak upstream of the catalyst was found.
Repair summary: Exhaust leak repair and system verification — catalyst was serviceable and not replaced.
Business results: SCR efficiency restored without an unnecessary catalyst replacement, saving significant cost.
Read Full Case Study
Fleet Preventive Emissions Maintenance Success
Challenge: A logistics fleet wanted to reduce unpredictable emissions derates and roadside tows.
Diagnostic findings: A scheduled diagnostic scan found drifting sensors and rising DPF load before any failure.
Repair summary: Preventive sensor replacement and DPF cleaning with a documented emissions PM schedule.
Business results: Roadside emissions failures eliminated and fleet uptime improved dramatically.
Read Full Case Study
Emergency Aftertreatment Repair
Challenge: A dump truck went into derate on a job site and could not return to work.
Diagnostic findings: Priority diagnostics found a restricted DPF that could not complete a forced regen.
Repair summary: Emergency DPF cleaning, root-cause repair of a failed temperature sensor, and forced regen.
Business results: Truck returned to the job site the same day at full power with no further derate.
Read Full Case StudyCustomer Testimonials
What Fleet Customers Say
“The fleet emissions program caught drifting sensors and rising DPF load before they became derates. Our downtime is way down and our trucks pass every inspection.”
Equipment: Line-haul tractor
Outcome: Emissions derates eliminated fleetwide.
James T.
Fleet Manager · Regional Transportation
“We were failing roadside emissions checks. CRANETEC brought every unit into compliance with documented repairs and a scheduled emissions maintenance program.”
Equipment: Utility trucks
Outcome: EPA compliance restored fleetwide.
Sandra M.
Fleet Supervisor · Municipal Public Works
“A dump truck went into derate on a job site. CRANETEC diagnosed a failed sensor, cleaned the DPF, and had it back to work the same day. Honest, fast, and professional.”
Equipment: Dump trucks
Outcome: Derate cleared, back to work same day.
Pete R.
Operations Manager · Southeast Construction
“A DEF warning was escalating. CRANETEC found contaminated fluid and a crystallized injector, fixed the root cause, and saved the catalyst. A shop that diagnoses first.”
Equipment: Bucket truck
Outcome: DEF system fixed before derate.
Linda K.
Utility Contractor · Fiber & Telecom
“My truck kept derating for an SCR fault that was really a bad NOx sensor. CRANETEC diagnosed it correctly, replaced the sensor, and the derate never came back.”
Equipment: Semi truck
Outcome: NOx sensor fixed, no false derate.
Marcus D.
Owner-Operator · Independent Hauler
“The emissions maintenance program paid for itself in avoided derates and roadside tows. Our cost per mile is down and our trucks are always inspection-ready.”
Equipment: Regional fleet
Outcome: Lower cost per mile fleetwide.
Greg H.
Fleet Director · Logistics Company
Cost Saving Opportunity
Accurate emissions diagnostics is the biggest cost saving in aftertreatment repair. A confirmed NOx sensor failure costs a fraction of an unnecessary SCR catalyst replacement. CRANETEC diagnoses the true root cause before replacing any part — protecting your budget and ensuring the repair fixes the truck the first time.
Interactive Comparison
Preventive Emissions Maintenance vs Reactive Repairs
The business case for scheduled emissions maintenance.
Downloadable Emissions Inspection Checklist
Commercial Emissions Inspection Checklist
A practical checklist fleet managers can use at every PM interval.
Commercial Benefits
Measurable Business Benefits
The measurable business benefits of professional emissions maintenance and repair for commercial fleets.
Reduced Engine Derates
Scheduled emissions maintenance clears faults before the ECM limits power and forces a derate.
Reduced Downtime
Planned maintenance replaces roadside failures, keeping trucks productive and on schedule.
Improved Fuel Economy
A clean DPF and efficient SCR restore the fuel economy lost to backpressure and frequent regens.
Longer DPF Life
Scheduled cleaning and root-cause repair extend DPF life instead of forcing early replacement.
Longer DEF System Life
Quality fluid and proper service protect the pump, injector, and catalyst from contamination damage.
Improved Fleet Reliability
Fewer derates and breakdowns mean more trucks available when the work arrives.
EPA Compliance
A functional aftertreatment system keeps every unit inspection-ready and violation-free.
Reduced Emergency Repairs
Early detection of drifting sensors and rising DPF load prevents the failures that cause derates.
Lower Operating Costs
A planned sensor or cleaning service costs a fraction of a roadside derate and tow.
Predictable Maintenance Costs
Planned, budgeted emissions maintenance replaces unpredictable, expensive emergency repair.
Fleet Manager Insight
Track emissions fault trends across the fleet, not just individual failures. A fleet that logs DPF load, DEF quality, sensor drift, and regen frequency for every unit can predict which truck will derate next — and plan the repair before it becomes a roadside emergency. Data turns reactive emissions repair into predictive maintenance.
Graphic Placeholder
Emissions Diagnostic Workflow
Side-by-side visualization of the diagnostic workflow from code scan through live data to root-cause analysis.
Comparison Tables
Emissions System Reference Tables
Quick-reference tables for fleet managers and commercial truck owners.
Table 1 — Common Emissions System Problems
| Problem | Symptoms | Recommended Repair | Repair Priority |
|---|---|---|---|
| Engine Derate | Reduced power, speed limit | Root-cause diagnostics and repair of triggering fault | High |
| DPF Restriction | DPF warning, frequent regen | Forced regen, cleaning, or replacement | High |
| Failed Regeneration | Regen does not complete | Diagnose temperature sensor, dosing, DPF condition | High |
| DEF Quality Warning | DEF warning light | Test fluid quality, replace fluid or quality sensor | High |
| DEF Pump Failure | Low DEF pressure | Pressure test, line inspection, pump replacement | High |
| DEF Injector Failure | SCR efficiency fault | Dosing test, injector replacement, system flush | High |
| SCR Efficiency Fault | SCR code, derate | NOx comparison, dosing, leak check, catalyst test | High |
| NOx Sensor Failure | False SCR fault | Sensor comparison test and replacement | High |
| EGR Valve Failure | Rough idle, smoke, power loss | Clean or replace EGR valve | Medium |
| EGR Cooler Failure | Coolant loss, white smoke | Pressure test and cooler replacement | High |
| Exhaust Temp Sensor | Failed regen | Sensor test and replacement | Medium |
| DPF Pressure Sensor | False DPF warning | Sensor test and replacement | Medium |
Table 2 — Fleet Emissions Maintenance Schedule
| Maintenance Item | Recommended Interval | Fleet Benefit |
|---|---|---|
| Diagnostic fault-code scan | Every PM | Catch faults before derate |
| DPF soot and ash load check | Every PM | Schedule cleaning before restriction |
| DEF quality test | Every PM | Protect pump, injector, catalyst |
| DEF filter replacement | Annual / major PM | Prevent dosing failures |
| NOx sensor trend monitoring | Every PM | Catch drift before false derate |
| EGR valve and cooler inspection | Every PM | Catch soot and leaks early |
| Regeneration history review | Every PM | Detect frequent or failed regens |
| DPF off-vehicle cleaning | By ash load / mileage | Extend DPF life, prevent derate |
Table 3 — Emissions System Components Comparison
| Component | Primary Function | Common Repairs |
|---|---|---|
| DPF | Traps soot and ash | Cleaning or replacement |
| DEF Pump | Delivers DEF to injector | Replacement and system flush |
| DEF Injector | Meters DEF into exhaust | Replacement and dosing verification |
| SCR Catalyst | Converts NOx using DEF | Replacement when efficiency fails |
| NOx Sensors | Measure NOx for SCR control | Replacement on failure |
| EGR Valve | Recirculates exhaust gas | Cleaning or replacement |
| EGR Cooler | Cools recirculated exhaust | Replacement on leak or clog |
| Exhaust Temp Sensors | Monitor regen temperature | Replacement on failure |
| DPF Pressure Sensor | Reports soot load | Replacement on failure |
| Aftertreatment Module | Manages system logic | Diagnostics and software updates |
Table 4 — Preventive Maintenance vs Reactive Repairs
| Category | Preventive | Reactive |
|---|---|---|
| Operating Costs | Low and predictable | High and unpredictable |
| Downtime | Minimal and planned | Significant and unplanned |
| Fuel Economy | Maintained | Reduced |
| Engine Performance | Full power | Derated |
| Fleet Reliability | High | Low |
| EPA Compliance | Maintained | At risk |
| Emergency Repairs | Rare | Frequent |
| Equipment Life | Extended | Shortened |
| Maintenance Planning | Planned and budgeted | Reactive and unpredictable |
Table 5 — Commercial Fleet Emissions Cost Analysis
| Cost Category | Business Impact | Operational Effect |
|---|---|---|
| Planned emissions maintenance | Low, predictable cost | Keeps trucks on schedule |
| DPF cleaning | Low cost, high return | Extends DPF life, prevents derate |
| NOx sensor replacement | Low cost, high return | Prevents false derates |
| DEF filter service | Low planned cost | Protects pump and injector |
| EGR cleaning | Low planned cost | Restores performance |
| Emergency DPF derate | High unplanned cost | Causes downtime and towing |
| Catalyst replacement | High cost | Needed only with confirmed failure |
| Roadside emissions breakdown | High indirect cost | Lost revenue and missed schedules |
Graphic Placeholder
Fleet Downtime Cost Comparison
Side-by-side visualization of planned emissions maintenance cost versus unplanned derate and roadside breakdown cost.
Image SEO Recommendations
Commercial Photography & Image SEO
Recommended original CRANETEC photography with SEO file names, alt text, titles, captions, and descriptions.
DPF Diagnostics
SEO File Name: dpf-diagnostics.jpg
Alt Text: Commercial truck DPF diagnostics with OEM scan tool
Image Title: DPF Diagnostics
Caption: Technician reading DPF soot load and regen history.
Description: A heavy-duty technician diagnosing a DPF system with an OEM-level scan tool.
Forced Regeneration
SEO File Name: forced-regeneration.jpg
Alt Text: Forced regeneration on a commercial diesel truck
Image Title: Forced Regeneration
Caption: Controlled regen cycle burns soot from the DPF.
Description: A technician performing a forced regeneration with OEM diagnostic tools.
DEF System Repair
SEO File Name: def-system-repair.jpg
Alt Text: DEF system pump and injector repair on a commercial truck
Image Title: DEF System Repair
Caption: DEF pump and injector tested for pressure and dosing.
Description: A technician repairing a DEF pump and dosing injector on a commercial truck.
SCR System Service
SEO File Name: scr-system-service.jpg
Alt Text: SCR system service and NOx sensor diagnostics
Image Title: SCR System Service
Caption: Upstream and downstream NOx compared for SCR efficiency.
Description: A technician servicing an SCR catalyst and NOx sensors.
EGR Valve Replacement
SEO File Name: egr-valve-replacement.jpg
Alt Text: EGR valve replacement on a heavy-duty diesel engine
Image Title: EGR Valve Replacement
Caption: Carbon-fouled EGR valve removed for cleaning or replacement.
Description: A technician replacing an EGR valve on a heavy-duty diesel engine.
Commercial Fleet Emissions Inspection
SEO File Name: commercial-fleet-emissions-inspection.jpg
Alt Text: Commercial fleet emissions inspection program
Image Title: Commercial Fleet Emissions Inspection
Caption: A fleet of trucks scheduled for emissions diagnostics.
Description: A row of commercial trucks at a scheduled fleet emissions inspection event.
Heavy-Duty Diesel Technician
SEO File Name: heavy-duty-diesel-technician.jpg
Alt Text: Heavy-duty diesel technician performing emissions repair
Image Title: Heavy-Duty Diesel Technician
Caption: An experienced technician diagnosing an aftertreatment system.
Description: A trained heavy-duty diesel technician performing emissions diagnostics.
OEM Diagnostic Equipment
SEO File Name: oem-diagnostic-equipment.jpg
Alt Text: OEM-level diagnostic equipment for commercial trucks
Image Title: OEM Diagnostic Equipment
Caption: OEM scan tools read fault codes and live data.
Description: OEM-level diagnostic equipment connected to a commercial truck ECM.
Commercial Repair Facility
SEO File Name: commercial-repair-facility.jpg
Alt Text: Commercial truck repair facility for emissions service
Image Title: Commercial Repair Facility
Caption: A commercial-only shop equipped for emissions repair.
Description: Inside a commercial repair facility set up for emissions and aftertreatment service.
Engine Derate Diagnostics
SEO File Name: engine-derate-diagnostics.jpg
Alt Text: Engine derate diagnostics on a commercial truck
Image Title: Engine Derate Diagnostics
Caption: Diagnostics trace the derate to its root cause.
Description: A technician diagnosing an engine derate with OEM scan tools.
Local Emissions Repair
Commercial Truck Emissions Repair Near You
If you are searching for commercial truck emissions repair near me, DPF repair near me, DEF system repair near me, SCR repair near me, forced regeneration near me, or aftertreatment repair near me, CRANETEC provides professional emissions diagnostics, DPF service, DEF system repair, SCR and EGR repair, forced regenerations, and fleet emissions maintenance for commercial trucks and fleets across Texas, Louisiana, Florida, North Carolina, and surrounding regions.
We are a heavy-duty diesel emissions repair shop specializing in commercial diesel emissions repair, fleet emissions repair, engine derate repair, commercial DPF cleaning, heavy duty diesel emissions repair, and commercial fleet repair. From DPF diagnostics and cleaning to DEF system repair, SCR service, EGR repair, NOx sensor replacement, forced regeneration, and complete aftertreatment diagnostics, our experienced diesel technicians handle every emissions component. Need broader heavy duty truck repair? We also provide full diesel repair and truck diagnostics across our service area.
Service Areas
Cities We Serve
Service Area
Supporting Every Type of Commercial Operation
CRANETEC supports both individual commercial vehicles and large fleet operations through professional emissions diagnostics, DPF service, DEF system repair, aftertreatment maintenance, and preventive maintenance. From one owner-operator truck to a multi-state fleet, our OEM-level diagnostics, scheduled programs, and experienced diesel technicians keep commercial vehicles at full power, emissions compliant, and productive across Texas, Louisiana, Florida, North Carolina, and surrounding regions.
Related Services & Resources
Explore the Heavy-Duty Truck Repair Cluster
FAQ
Commercial Truck Emissions Repair FAQs
40 in-depth answers for fleet managers, owner-operators, and commercial truck owners — optimized for AI search and featured snippets.
Final Call To Action
Restore Performance & Eliminate Engine Derates With Expert Emissions Repair
CRANETEC helps transportation companies, contractors, municipalities, utilities, and commercial fleets reduce downtime, eliminate engine derates, maintain EPA compliance, improve fuel efficiency, extend aftertreatment system life, and lower operating costs through expert DPF, DEF, SCR, EGR, and complete emissions system diagnostics and repair.