Diagnostic Test

VERIFY DTC IS ACTIVE

NOTE:

Make sure the battery is fully charged before proceeding.

Cycle the ignition on.
With the scan tool, read the active DTCs.
Does the scan tool display: U0121-00-LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE?

Yes
- Refer to the BODY CONTROL MODULE (BCM) - DIAGNOSTIC CODE INDEX article and perform the U0121-00-LOST COMMUNICATION WITH ANTI-LOCK BRAKE SYSTEM (ABS) CONTROL MODULE diagnostic procedure.
No
- Refer to DIAGNOSIS AND TESTING and perform the STORED LOST COMMUNICATION DTCs diagnostic procedure.