Diagnostic Test

CHECK FOR AN ACTIVE DTC

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 this DTC as active?

Yes
- Refer to DIAGNOSTIC CODE INDEX and perform the U0121-00-Lost Communication with Anti-lock Brake System (ABS) Control Module diagnostic procedure.
No
- Refer to STORED LOST COMMUNICATION DTCS and perform the Stored Lost Communication DTCs diagnostic procedure.