DTC U0100: Lost Communication with ECM/PCM A: Description

WARNING: This page is about a different car, the 2010 Mercury Milan, 2010 Lincoln MKZ, and 2010 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.

The PSCM will monitor the HS-CAN bus when the ignition has been on for more than 5 seconds, when the voltage to the PSCM is greater than 9 volts and when there are no DTCs present that are inhibiting PSCM operation.

DTC U0100:00 (Lost Communication with ECM/PCM A: No Sub Type Information) - This DTC will set if communications between the PSCM and the PCM fail. The PCM sends 2 message bundles to the PSCM. If 1 or both of these messages is missing for more than 5 seconds and the PSCM has not set DTC U0001:88, then the PSCM will set U0100:00.