Powertrain

U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE

For complete wiring diagrams refer to Diagrams/Electrical.

- When Monitored:

Ignition run time is greater than 1 second. Battery voltage between 10 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. One Trip fault.





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

Diagnostic Test

1. ACTIVE DTC

Ignition on, engine not running.

With a scan tool, select View PCM DTCs.

Is the DTC Active at this time?

Yes

- Refer to Testing.

No

- Refer to the INTERMITTENT CONDITION Diagnostic Procedure. Intermittent Condition
- Perform the POWERTRAIN VERIFICATION TEST. Powertrain Verification Test