Diagnostic Test
- ACTIVE DTC NOTE:
For vehicle communication problems, use the scan tool to refer to the Network Review Screen. The screen depicts a high level view of the vehicle network. Fault and problem areas appear in red. Selecting any of the network components allows access to the source of the problem.
- Ignition on, engine not running.
- With a scan tool, select View DTCs.
Is the status Active for this DTC?
Yes
- Go To 2
No
- Perform the INTERMITTENT CONDITION diagnostic procedure. Refer to STANDARD PROCEDURE .
- U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE ALSO SET
- With a scan tool, select View DTCs.
Is the DTC U0121-LOST COMMUNICATION WITH ANTI-LOCK BRAKE MODULE also set?
Yes
- Refer to 2.0L & 2.4L - DIAGNOSTIC CODE INDEX and perform the appropriate U0141-Lost Communication with IPM (FCM/TIPM) diagnostic procedure.
No
- Replace and program the Powertrain Control Module (PCM) in accordance with the Service Information.
- Perform the PCM VERIFICATION Test. Refer to POWERTRAIN VERIFICATION TEST .
- With a scan tool, select View DTCs.