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 sets when communication between the PSCM and the ABS module fails. If the wheel speed message is missing for 1 second or the steering wheel component angle message is missing for 5 seconds, this DTC sets.