Lost Communication with Parking Brake Control Module
The vehicle network has lost the electric parking brake (EPB) controller. Auto-hold is disabled, the EPB warning lamp comes on. EPB cannot be released electrically.
Affected components
- Epb module
- Can bus wiring
Common causes
- High likelihood: EPB module unpowered
- Medium likelihood: CAN wiring to EPB damaged
- Low likelihood: Gateway module routing CAN messages incorrectly
Possible 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
Diagnostic notes
- The malfunction indicator lamp may illuminate
- Reduced-power or limp mode may occur
Sources
Diagnostic information is provided for reference only. Confirm the code with a compatible scan tool and follow the vehicle manufacturer's service procedures before replacing components.