Diagnostic Test

WARNING: This page is about a different car, the 2016 Jeep Wrangler and 2015 Jeep Wrangler. However, it is still accessible from the selected car via links, so may be relevant.

ACTIVE DTC

Ignition on, engine not running.
With the scan tool, select view DTCs.
Is the DTC Active at this time?

Yes
- Perform the U0100-LOST COMMUNICATION WITH ECM/PCM diagnostic procedure.
No
- Refer to DIAGNOSIS AND TESTING and perform the STORED LOST COMMUNICATION DTCs diagnostic procedure.