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

The PSCM monitors the HS-CAN bus when the ignition has been on for more than 5 seconds, when the voltage to the PSCM is greater than 6.5 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. The ABS module sends the following messages to the PSCM: Wheel speed, tire size, lateral acceleration, steering angle offset, traction control. If one or more of these messages is missing for more than 5 seconds (30 seconds for tire size) and the PSCM has not set DTC U0001:88, then the PSCM sets U0121:00.