OBD-II code · Network
U0136 Lost Communication with Park Brake Module B
The Park Brake Module B has stopped transmitting on the vehicle data bus, so other control units no longer receive its messages. A second parking-brake actuator is unreachable, affecting the electric brake. 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.
Is it safe to drive with U0136?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelySecondary EPB module unpowered
- PossibleCAN wiring to secondary EPB broken
- Less likelyGateway 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
Repair at a glance
- Difficulty
- Hard
- DIY friendly
- Best left to a mechanic
- Typical labour
- 1–5 h
- Emissions test
- Usually unaffected
- Parts involved
- Parking Brake Module, Can Bus Wiring
Related codes
- U0133Lost Communication with Yaw Rate Sensor Module
- U0134Lost Communication with Restraints System Sensor (Side Sensor)
- U0135Lost Communication with Parking Brake Control Module
- U0137Lost Communication with Trailer Brake Control Module
- U0138Lost Communication with All Terrain Control Module
- U0139Lost Communication with Active Roll Control Module
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.