Normal Operation

WARNING: This page is about a different car, the 2012 Ford Pickup. However, it is still accessible from the selected car via links, so may be relevant.

DTC U0100 (Lost Communication With ECM/PCM "B") - this DTC sets in continuous memory or on-demand in the Trailer Brake Control (TBC) module if data messages received (vehicle speed) from the PCM are missing for more than 5 seconds. For a complete list of all network messages, REFER to MODULE COMMUNICATIONS NETWORK .

This pinpoint test is intended to diagnose the following:

PCM
TBC module