DTC U0401: Invalid Data Received from ECM/PCM A: Action
WARNING: This page is about a different car, the 2011 Mercury Milan, 2011 Lincoln MKZ, and 2011 Ford Fusion. However, it is still accessible from the selected car via links, so may be relevant.
Action
RETRIEVE and RECORD all PCM DTCs. REFER to the ENGINE CONTROLS - POWERTRAIN DTC CHARTS AND DESCRIPTIONS (HYBRID) or ENGINE CONTROLS - POWERTRAIN DTC CHARTS AND DESCRIPTIONS - (EXCEPT HYBRID) to diagnose the engine speed or vehicle speed concern.