Diagnostic Test

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

VERIFY THE DTC IS ACTIVE

NOTE:

Make sure the IOD fuse is installed and the battery is fully charged before proceeding.

Turn the ignition on.
With the scan tool, read the active DTCs.
Is the DTC active at this time?

Yes
- Perform the U0100-87 - Lost Communication with ECM/PCM diagnostic procedure. Refer to the appropriate diagnostic information .
No
- Refer to STORED LOST COMMUNICATION DTCS and perform the Stored Lost Communication DTCs diagnostic procedure.