Lost Communication with Auto Park Brake Module
The Auto Park Brake Module has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. Automatic parking-brake functions stop working. Typical causes are loss of power or ground at the module, an open or shorted CAN/LIN bus wire, a connector fault, or an internal module failure.
Affected components
- Park brake module
- Can bus wiring
Common causes
- High likelihood: EPB module unpowered
- Medium likelihood: CAN wiring to EPB broken
- 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
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.