VOLVO
PAC-U012187 - Lost Communication With Brake Control Module. Bus Signal / Message Failures. Missing message
System
Powertrain (Engine & Gearbox)
Volvo models this fault code applies to
Applies to the following models:
8 modelsS60 (2011–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)
What does this fault code mean?
The parking assistance camera module (PAC) talks to the brake control module (BCM) non-stop. The fault is set when communication with the BCM is disturbed or missing. The fault can come from a missing voltage supply or ground to the brake control module, contact resistance, broken or short-circuited CAN wires, or a brake control module that is not intended for the car.
Possible causes
- No power reaches the brake control module (BCM)
- Open circuit in the ground wire to the brake control module (BCM)
- Contact resistance in the connections
- Open circuit or short circuit in the CAN wires
- The brake control module (BCM) does not match this car, such as a second-hand unit with other software or hardware
What you can do
- 1Check that the fuses are intact and that the earth points to the brake control module are firmly fixed and not oxidised
- 2Erase the fault code and test drive the car to see whether it comes back
- 3Has the brake control module been replaced recently? Tell the workshop, since it then needs the right software
- 4Have a workshop check the power supply and the CAN wires to the brake control module. The braking system is safety-critical, so do not work on the brake control module yourself
Symptoms you may notice1
- The parking camera does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.