DPF Faults
Diagnose regeneration-related faults, restriction data and supporting sensors.
DPF • SCR • DEF • DERATE
Aftertreatment & Derate Diagnostics
Electronic diagnosis for aftertreatment faults, warning lights, derates and related sensor or system concerns.
MOBILE HEAVY-DUTY SERVICE
Diagnose the System — Not Just the Symptom
Smith Truck Repair brings commercial-truck diagnostics and repair to the truck, yard or roadside location. Work is scoped to the actual fault and approved before repairs expand.
- DPF / regeneration fault diagnosis
- SCR / DEF system diagnostics
- NOx, temperature and pressure sensor faults
- Derate and inducement troubleshooting
- Wiring and connector checks
- Root-cause diagnosis before parts replacement
REAL SMITH TRUCK REPAIR WORK
Field-Proven Capability
Photos shown on this website include real repair and diagnostic work performed by Smith Truck Repair.
SERVICE CAPABILITIES
Aftertreatment & Derate Diagnostics
SCR / DEF
Troubleshoot DEF dosing, quality, pressure, heating and SCR-related faults.
NOx / Temperature Sensors
Test electronic faults and supporting circuits before replacing components.
Derates
Trace the active fault path responsible for reduced power or inducement conditions.
Electrical Support
Inspect wiring, connectors, power and grounds tied to aftertreatment fault codes.
Repair Planning
Provide findings and a repair direction based on diagnostic evidence and application.
NEED THIS SERVICE?
Send the Truck Details Before Dispatch
Use the online questionnaire to send the location, truck information, symptoms, fault codes and photos.