Safety Warning
DIY auto repair can cause serious injury, fire, or vehicle damage. These guides are for informational purposes only. Always follow OEM torque specs, wear PPE, and consult a certified mechanic if you are unsure. You are solely responsible for your safety.
Normal Operation and Fault Conditions
With the ignition ON, the TCCM sends messages to the GWM over the HS-CAN1, the GWM relays these messages to the ABS module over the HS-CAN 2. If the ABS module does not receive these messages within a certain time frame (usually less than 1 second), the ABS module sets a DTCs. For information on the messages sent to the ABS module by the TCCM, refer to the Description and Operation in the Anti-Lock Brake System (ABS) and Stability Control article.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
| ABS U0102:00 |
Lost Communication with Transfer Case Control Module: No Sub Type Information | This DTC sets when the ABS module does not receive any messages from the PCM . |
| ABS U0403:00 |
Invalid Data Received From Transfer Case Control Module: No Sub Type Information | This DTC sets when the ABS module receives one or more messages from the PCM that contain invalid or out of range information. |
NO RELATED
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When to See a Mechanic
Stop DIY work and contact a certified mechanic immediately if any of the following apply:
- • You smell fuel, burning insulation, or see smoke.
- • Brakes feel soft, pull hard to one side, or make grinding noises.
- • The engine overheats, stalls repeatedly, or misfires under load.
- • You are missing required tools, torque specs, or safe lifting equipment.
- • You are not confident in the next step or safety outcome.