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.
Pinpoint Test BP: Abs (Anti-Lock Brake System) Module Communication Concern With The GWM (Gateway Module A): Notes
Refer to VEHICLE DYNAMIC SYSTEMS for schematic and connector information.
Normal Operation and Fault Conditions
REFER to: Anti-Lock Brake System (ABS) and Stability Control - System Operation and Component Description .
With the ignition ON, the GWM sends messages to the ABS module over the FD-CAN. If the ABS module does not receive these messages within a certain time frame (usually less than 1 second), the ABS module sets Diagnostic Trouble Codes (DTCs). This can be due to a GWM failure, a circuit failure on the FD-CAN or an excessive load on the network.
DTC Fault Trigger Conditions
| DTC | Description | Fault Trigger Condition |
|---|---|---|
| ABS U0146:00 | Lost Communication With Serial Data Gateway "A": No Sub Type Information | This DTC sets in the ABS module if the IPC messages from the GWM are missing for more than 5 seconds. |
Possible Sources
- Network communication concern
- GWM
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.