OBD-II code · Network
U0181 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.
Is it safe to drive with U0181?
Usually safe for short trips, but don’t ignore it: the underlying fault can get more expensive over time.
Common causes
- Most likelyEPB module unpowered
- PossibleCAN wiring to 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
- Park Brake Module, Can Bus Wiring
Related codes
- U017ELost Communication With Seat Belt Pretensioner Module A
- U017FLost Communication With Seat Belt Pretensioner Module B
- U0180Lost Communication with Automatic Lighting Control Module
- U0182Lost Communication with Headlamp Leveling Control Module
- U0183Lost Communication with Sunroof Control Module
- U0184Lost Communication with Radio
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.