Diagnostic Trouble Code (DTC) Information

Diagnostic trouble code (DTC) information ECM-P050125

Condition
The Engine control module (ECM) monitors the information that comes from other control modules. The transmission control module (TCM) and the brake control module (BCM) inform, among other things, about the vehicle speed, via the controller area network (CAN). The information is used by the engine control module (ECM) for, among other things, controlling idle speed. The engine control module (ECM) checks the vehicle speed signals by comparing them with each other. The speed signal from the brake control module (BCM) is the main signal. The speed signal from the transmission control module (TCM) is the reference signal.
The diagnostic trouble code (DTC) is stored if the control module detects that:
- The main signal deviates too much from the reference signal.
The control module's test for the diagnostic trouble code (DTC) starts in the event of:
- Speeds above 20 km/h.

Substitute value

- None.

Possible source

- Incorrect speed signal from the transmission control module (TCM).
- Incorrect speed signal from the brake control module (BCM).

Fault symptom[s]
- Malfunction indicator light (MIL), on
- Uneven idle