Diagnostic Test
- ACTIVE DTC
- Ignition on, engine not running.
- With the scan tool, select view DTCs.
Is the DTC Active at this time?
Yes
- Refer to TOTALLY INTEGRATED POWER MODULE (TIPM) - DIAGNOSTIC CODE INDEX and perform the U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE diagnostic procedure.
No
- Refer to DIAGNOSIS AND TESTING and perform the STORED LOST COMMUNICATION DTCS diagnostic procedure.