VOLVO
IHU-U012100 - Lost Communication With Brake Control Module. General Failure Information. No sub type information
System
Infotainment Head Unit (IHU)
Volvo models this fault code applies to
Applies to the following models:
9 modelsS60 (2011–), S80 (2007–), 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 head unit (IHU) receives information from the brake control module (BCM) over CAN and monitors the link to it. The code is stored when communication with the BCM is lost.
Possible causes
- An open circuit in the communication line
- A short to ground in the communication line
- A short to supply voltage in the communication line
- Contact resistance, oxidation or breaks in the connections
What you can do
- 1Read and clear the code, then check whether it comes back
- 2Check that the fuses are intact
- 3Check that the connectors in the connections are firmly seated and free from oxidation
- 4Use a multimeter to check that the communication line has no break and no short to ground or supply voltage
- 5If the fault remains, have a workshop trace the communication line further
- 6The braking system is safety-critical, so do not work on the brake control module or the braking system yourself; have a workshop do it
Symptoms you may notice1
- Warning symbol and text message in the display
General guidance for car owners. Diagnosis on the car can point to a different cause.