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 T: Abs (Anti-Lock Brake System) Module Communication Concern With The VDM (Vehicle Dynamics Control Module)
- Refer to Horn/Cigar Lighter
for schematic and connector information.
Normal Operation and Fault ConditionsÂ
With the ignition ON, the VDM sends messages to the ABS module over the HS-CAN2 through the GWM. If the ABS module does not receive these messages within a certain time frame or if the messages contain invalid data, the ABS module sets DTC. For information on the messages sent to the ABS module by the VDM, refer to Network Message Charts .
DTC Fault Trigger ConditionsÂ
DTC Description Fault Trigger Condition ABS U0122:00 Lost Communication With Vehicle Dynamics Control Module: No Sub Type Information This DTC sets in the ABS module when the dynamic suspension data message from the VDM is missing for at least 5 seconds. Possible SourcesÂ
- Network communication concern
- VDM
- T1 CHECK DATA FROM VDM (VEHICLE DYNAMICS CONTROL MODULE)
- A DTC has been set which has the following description:
- Invalid Data Received From the VDM.
- 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 VDM. Check the CAN bus and terminating resistor (60 ohm) at the OBD connector. Check CAN bus circuit. Check for other failures in the VDM. 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.