Diagnostic Test

WARNING: This page is about a different car, the 2017 Jeep Cherokee. However, it is still accessible from the selected car via links, so may be relevant.

CHECK FOR AN ACTIVE DTC

NOTE:

Make sure the battery is fully charged before performing any diagnostic procedure.

With the scan tool, refer to the Network Review Screen to display a high level view of the vehicle communication network. Modules shown in red are problem areas.

Always diagnose any Body Control Module (BCM) DTCs first before proceeding.

Turn the ignition on.
With the scan tool, create a Vehicle Scan Report and attach it to the repair order.
Using the scan tool, read active DTCs.
Is the DTC active?

Yes
- Perform the Lost Communication with PCM diagnostic procedure in the BCM. Refer to U0100-87-LOST COMMUNICATION WITH ECM/PCM - MISSING MESSAGE .
No
- Perform the Stored Lost Communication DTCs diagnostic procedure. Refer to STORED LOST COMMUNICATION DTCS .