What it means
A control module has detected that its software version does not match the parking brake module. Most often after replacing the EPB unit with one from a different model year or coding variant.
At a glance
- Usually lights the warning light of the system that lost communication
How it works
The park brake control module operates the electronic parking brake and communicates its status and commands to other modules. This code sets when another module finds that the park brake module’s software or coding does not match the version expected by the vehicle.
Common causes
Most likely first.
- EPB software/calibration mismatch
- Used EPB module fitted from different vehicle
- Gateway module routing CAN messages incorrectly
Symptoms
- Multiple warning lights may illuminate
- Affected modules may go into limp mode or shut down
- Specific functions inoperative depending on module
- Diagnostic tools may show communication faults
How to diagnose it
- Scan the park brake module and other controllers, saving freeze-frame data and checking whether the fault followed module replacement or programming.
- Verify that the installed park brake module matches the vehicle’s model year and coding variant.
- Inspect the module connector, power and ground, and network wiring for loose connections, corrosion, or damage.
- Read the module’s software and configuration identification using a capable scan tool and compare it with the vehicle’s required setup.
- If the part and wiring are suitable, check gateway message routing and arrange vehicle-specific park brake coding or programming.
Common fixes
- Reconnect or repair the park brake module’s connector or network wiring.
- Code or program the park brake module to match the vehicle’s configuration.
- Replace a module from an incompatible model year or variant with the correct application, then program it.
- Correct gateway routing or network communication faults affecting park brake messages.
Can I keep driving?
The electronic parking brake may not apply or release reliably, so confirm the vehicle is securely parked and avoid relying on the system until repaired. If the brake is stuck or a brake warning appears, do not continue driving.
A code shows where the control module detected a fault, not always which part failed. Check the causes in order and confirm with a test before replacing parts. Have several codes? Check them together
This is a generic code: it means the same on every make. The car’s maker may add more detail in its own service information.