Diagnostic Test
VERIFY DTC IS ACTIVE
NOTE:
Make sure the battery is fully charged before proceeding.
- Turn 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 DIAGNOSTIC CODE INDEX and perform the U0121-87-Lost Communication with Anti-lock Brake System (ABS) Control Module-Missing Messages diagnostic procedure.
No
- Perform the Stored Lost Communication DTCs diagnostic procedure. Refer to the STORED LOST COMMUNICATION DTCS .