Lost Communication With Park Brake Control Module

What it means

This code applies to vehicles with an electric parking brake and means a module on the network is no longer receiving messages from the park brake control module. The parking brake may not apply or release with its switch, and automatic release when pulling away may stop working. On some vehicles this function is built into the ABS module rather than a separate unit.

Related codes: U0121U0129U0140U0001P0562

Symptoms4

• Parking brake fault light or a warning message in the cluster.
• Parking brake does not respond to the apply or release switch.
• Parking brake does not release automatically when driving off.
• Auto hold at stops not working on some vehicles.

Possible causes6

• Blown fuse for the module or the parking brake motors.
• Weak battery; the parking brake motors draw high current and are sensitive to low voltage.
• Corrosion or water in the module connector.
• Poor module ground connection.
• Open or shorted CAN wiring to the module.
• Internal failure of the park brake module, or of the ABS module when the function is built into it.

How to diagnose5

1. Check the service information to see whether the park brake module is separate or built into the ABS module.
2. Test the battery and measure voltage while running, since low voltage is a common cause.
3. Try to connect to the module with a scan tool; if it does not respond, check its fuses, power and ground.
4. Inspect the module connector for water or corrosion.
5. Check the CAN lines to the module and compare their resistance with the manufacturer specification.

How to fix5

1. Charge or replace the battery and replace any blown fuse.
2. Clean the connector and repair the ground point.
3. Repair damaged network wiring.
4. Update the module software, or replace it if proven faulty, then program and calibrate it with a scan tool.
5. Clear the codes and apply and release the parking brake several times to confirm the code does not return.

Repair cost

In Saudi riyals; the highlighted part is the expected range for this fault.

The cost is low for a battery, fuse or connector, rises when the park brake module is replaced and programmed, and is higher if it is built into the ABS module.

Prices are rough estimates for common cars at independent workshops and vary with the car and the source of the part.
Prices last updated: September 2026

Frequently asked questions