Pinpoint Test F : DTC U0121: Notes
Refer to Module Communications Network for schematic and connector information.
Normal Operation and Fault Conditions
The GSM communicates with the ABS module through messages sent over HS-CAN. The modules exchange information such as gear position and vehicle speed.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| GSM U0121:00 | Lost Communication With Anti-Lock Brake System (ABS) Control Module "A": No Sub Type Information | This DTC sets when the GSM does not receive expected HS-CAN messages from the ABS module. |
Possible Sources
- Communication concern
- High network traffic
- ABS
- GSM