DTC U0001: High Speed CAN Communications Bus: 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 U0001:88 (High Speed CAN Communication Bus: Bus Off) - This DTC will set if the PSCM detects that transmission of HS-CAN bus messages is not acknowledged by other modules for 400 milliseconds or if the HS-CAN bus is deemed to have a communication error for greater than 5 seconds.