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 AU: Abs (Anti-Lock Brake System) Module Communication Concern With The RCM (Restraints Control Module)
- Refer to Vehicle Dynamic Systems
for schematic and connector information.
Normal Operation and Fault ConditionsÂ
With the ignition ON, the RCM module sends messages to the ABS module over the HS-CAN2 through the GWM. If the ABS module does not receive these messages within the allotted time frame or if the messages contain invalid data, the module sets a DTC. This can be due to a RCM module failure, a circuit failure on the network or an excessive load on the network. For information on the messages sent to the ABS module by the RCM module, refer to Network Message Charts .
DTC Fault Trigger ConditionsÂ
DTC Description Fault Trigger Condition ABS U0452:41 Invalid Data Received From Restraints Control Module: General Checksum Failure Sets when the messages received from the RCM indicate invalid information or indicate a fault. Possible SourcesÂ
- Network communication concern
- GWM
- RCM module
- AU1 CHECK CAN (CONTROLLER AREA NETWORK) DATA
- A DTC has been set which has the following description:
- Invalid Data Received From RCM module
- Ignition ON.
- Clear the ABS DTCs.
- Ignition OFF.
- Ignition ON.
- Wait at least 1 minute.
- Using a diagnostic scan tool, retrieve all DTCs from the ABS module. NOTE: DTCs may be displayed from previous diagnostic actions.
Did the DTCs return?Â
Yes Invalid or Missing CAN Data From the RCM. Check the CAN bus and terminating resistor (60 ohm) at the OBD connector. Check CAN bus circuit. Check for other failures in the RCM module. Notice: Do not replace the ABS module. No Return the vehicle to the customer. If the fault reoccurs inform the customer to note any relevant conditions at the time of the fault. The test is now exiting. - A DTC has been set which has the following description:
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.