U0100-00-Lost Communication With ECM/Pcm
WARNING: This page is about a different car, the 2021 Chrysler 300. However, it is still accessible from the selected car via links, so may be relevant.
NOTE:
Perform this diagnostic procedure ONLY when the DTC status is "Active". If the DTC status is "Stored" DO NOT proceed with this diagnostic procedure. A "Stored" DTC will not affect the performance of the vehicle.
The COMMUNICATION DIAGNOSTIC PROCEDURE MUST be performed before replacing any component(s) or module(s). Perform the COMMUNICATION DIAGNOSTIC PROCEDURE. Refer to COMMUNICATION DIAGNOSTIC PROCEDURE .