Pinpoint Test D : DTC (Diagnostic Trouble Code) U0121:00 Or DTC (Diagnostic Trouble Code) P1934:87: Notes
WARNING: This page is about a different car, the 2015 Ford C-Max. However, it is still accessible from the selected car via links, so may be relevant.
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
- Communication network concern
- Battery voltage concern
- BCM
- ABS Module