Freightliner CPC Module Problem: What Is It?
By JEREMY PROOME on Jul 17, 2025The CPC stands for the Common Powertrain Controller (CPC) module, acting as a ‘brain’ behind a truck’s performance. These can be found in freightliners and act as a type of electronic control unit. The CPC manages the engine and powertrain functions, controlling elements like throttle response, torque, the speed limiter, fuel gauge, and even odometer tracking.
While the CPC and ECU are related, the ECU primarily controls the engine's operation, while the CPC is a separate control unit for powertrain functions and can åmodify the ECU's functionality. Another important component that communicates with the CPC is the Motor Control Module (MCM).
If your vehicle is experiencing a dead throttle, check-engine lights, DEF (Diesel Exhaust Fluid) gauge issues, or a complete failure to start, this could be the result of a faulty CPC module. Thankfully, CPCs can be repaired.
You can get your CPC unit diagnosed and tested at The ECU Pro, who offer professional and comprehensive diagnostic tests to customers and fleets.
Mail in automotive electronic repair services
The ECU Pro offers an affordable mail-in repair service for automotive electronics. To have your unit repaired, simply remove the part and mail it to us. Our professional team will either test, repair, or clone your unit.
Our team has over 30 years experience in automotive electronic repairs. We specialize in German vehicles such as BMW, Mercedes and Mini. Our main focus is engine control unit repairs ( ECU, PCM or DME). Our state of the art facility has over 30 test vehicles to ensure that all parts are tested in actual vehicles before being returned to our clients.
Most of the services we provide is plug and play and doesn't require any additional coding.
