GPEC

U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE





For a complete wiring diagram refer to Diagrams/Electrical.

- When Monitored:

Ignition run time is greater than 1 second. Battery voltage between 9 and 16 volts. Engine run time greater than 3 seconds.

- Set Condition:

The PCM doesn't receive an ABS message over the CAN C circuit for 7 consecutive seconds. The circuit is continuously monitored.






Refer to Communications for diagnostic procedures and for further possible causes.

Diagnostic Test

1. ACTIVE DTC

Ignition on, engine not running.

With a scan tool, select View DTCs.

Is the status Active for this DTC?

Yes

- Refer to Communications for diagnostic procedures and for further possible causes.

No

- Refer to the *CHECKING FOR AN INTERMITTENT DTC Diagnostic Procedure. Checking for an Intermittent DTC
- Perform the PCM Verification Test Ver. 1. PCM Verification Test