DTC U0121: Lost Communication with the Anti-lock Brake System (ABS) Control Module: Description

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 U0121:00 (Lost Communication with the Anti-lock Brake System (ABS) Control Module: No Sub Type Information) - This DTC will set when communication between the PSCM and the ABS module fails. The ABS module sends the following messages to the PSCM; steering angle, wheel speed and lateral acceleration. If one or more of these messages is missing for more than 5 seconds (1 second for wheel speed) and the PSCM has not set DTC U0001:88, then the PSCM will set U0121:00.