DTC U0401: Invalid Data Received from ECM/PCM A: Description

The PSCM monitors the HS-CAN when the ignition has been on for more than 5 seconds, the voltage to the PSCM is greater than 10 volts and there are no DTCs present inhibiting PSCM operation.

• DTC U0401:00 (Invalid Data Received from ECM/PCM A: No Sub Type Information) - This DTC sets if the PSCM receives invalid or unknown messages from the PCM instead of valid engine speed, engine state and vehicle speed data messages.