Truck ECM Repair
Module Repair Lab provides expert semi-truck and diesel ECM repair for fleets, owner-operators, and repair shops. We rebuild engine control modules at the board level—diagnosing and replacing the failed components inside your original unit—so you avoid the cost and programming hassle of a brand-new dealer module. We service Freightliner, Kenworth, Peterbilt, International, Volvo, and Western Star trucks, plus diesel pickups, with nationwide mail-in service.
Truck ECMs & engine controllers we repair
- Detroit Diesel CPC4 common powertrain controllers (Freightliner Cascadia & Western Star)
- Detroit Diesel DDEC III, IV, V & VI ECMs
- Cummins N14 Celect / Celect Plus, CM871 (ISX) and related ECMs
- PACCAR MX-13 & MX-11 ECMs (Kenworth & Peterbilt)
- Ford 6.0 Powerstroke FICM and GM Duramax FICM diesel modules
Common ECM failures & symptoms we fix
- Truck won't start or the ECM won't communicate with a scan tool
- Intermittent shutdowns, derates, or hard-to-trace running faults
- CPC4 hardware failure and codes such as SPN 609 FMI 12
- Injector driver / output circuit failures and internal board damage
- Water, corrosion, or heat damage and multiple stored fault codes
How our mail-in ECM repair works
- Find your engine or module below and place your order.
- Remove your ECM and ship it to us using the included instructions.
- We rebuild it at the board level and bench-test it under load.
- We return it ready to install—your original calibration is retained, so no dealer programming is required.
Browse truck ECM & CPC4 repairs by engine
- CPC4 ECM Repair for Freightliner Cascadia & Western Star (Detroit Diesel)
- Cummins N14 Celect Plus ECM Repair
- 2001 - 2005 Chevrolet Silverado 2500/3500 Duramax LLY FICM Repair
- Paccar MX-13 & MX-11 ECM Repair for Kenworth & Peterbilt Trucks
- CPC4 Module Repair for Freightliner Cascadia (2014–2019)
- CPC4 Module Repair for Freightliner Cascadia (2014–2019)
- CPC4 Module Repair for Freightliner Cascadia (2014–2019)
- Cummins CM871 ECM Repair for ISX Engines
- Cummins N14 Celect ECM Repair
- Ford 6.0 Powerstroke FICM Repair Service (2003–2009 Super Duty)
- CPC4 Module Repair for Freightliner Cascadia (2014–2019)
- CPC4 Module Repair for Freightliner Cascadia (2014–2019)
- DETROIT DIESEL DDEC 6 ECM REPAIR SERVICE
- DETROIT DIESEL DDEC 5 ECM REPAIR SERVICE
- DETROIT DIESEL DDEC 4 ECM REPAIR SERVICE
- DETROIT DIESEL DDEC 3 ECM REPAIR SERVICE
New to CPC4 faults? Read our guide on common CPC4 module failures in Freightliner & Western Star trucks.
Frequently asked questions
Do I need to reprogram the ECM after repair? No. We repair your original module and retain its existing calibration, so it installs plug-and-play with no dealer programming.
Do you repair the module or replace it? We repair and rebuild your original ECM at the component level, which is more affordable and avoids VIN/calibration matching issues.
How long does it take? Most truck ECMs are rebuilt and shipped back quickly after we receive them—contact us for the current turnaround on your engine.
