DTC U0401: Invalid Data Received from 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 U0401:00 (Invalid Data Received from ECM/PCM A) - This DTC will set if the PSCM receives invalid or unknown messages from the PCM instead of the actual engine speed (non-hybrid), ready light (hybrid) and vehicle speed (all) data messages, in addition to DTC U0001:00 is not present in the PSCM.