Powertrain Control Module (PCM)

U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE





For a complete wiring diagram, consult the Wiring Information.

- When Monitored:
Ignition run time is greater than one second. Battery voltage between 9 and 16 volts. Engine run time greater than three seconds.

- Set Condition:
The Powertrain Control Module (PCM) doesn't receive an ABS message over the CAN C circuit for seven consecutive seconds. The circuit is continuously monitored. One Trip fault.





ACTIVE DTC
1. Ignition on, engine not running.
2. With a scan tool, select View PCM DTCs.

Is the DTC Active at this time?

Yes

- Perform the U0121-Lost Communication with Antilock Brake Module diagnostic procedure. Totally Integrated Power Module (TIPM)

No

- Perform the Stored Lost Communication DTCs diagnostic procedure. Stored Lost Communication DTCs