Diagnostic Test

WARNING: This page is about a different car, the 2018 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

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 DIAGNOSIS AND TESTING and perform the U0121-87-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.