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

The PSCM monitors the HS-CAN messages when the ignition has been on for more than 5 seconds, the voltage to the PSCM is greater than 9 volts and there are no DTCs present inhibiting PSCM operation.

• DTC U0121:00 (Lost Communication with the Antilock Brake System (ABS) Control Module: No Sub Type Information) - This DTC is 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, yaw rate, stability control active and ABS active. If one or more of these messages is missing for more than 1 second and the PSCM has not set DTC U0001:88, then the PSCM sets DTC U0121:00.