Pinpoint Test B : DTC (Diagnostic Trouble Code) U0121:00 Or P1934:87: Notes

Normal Operation and Fault Conditions

The BCM communicates with the ABS module over the HS-CAN. REFER to: Communications Network - System Operation and Component Description

DTC Fault Trigger Conditions

DTC	Description	Fault Trigger Conditions
U0121:00	Lost Communication With Anti-Lock Brake System (ABS) Control Module: No Sub Type Information	A continuous memory DTC that sets in the BCM if ABS messages received from the ABS module over the HS-CAN are missing.
P1934:87	Vehicle Speed Signal: Missing Message	A continuous memory DTC that sets in the BCM if ABS vehicle speed messages received from the ABS module over the HS-CAN are missing.

Possible Sources