VOLVO
SUM-U012100 - Lost Communication With Brake Control Module. General Failure Information. No sub type information
System
Suspension Module (SUM)
Volvo models this fault code applies to
Applies to the following models:
7 modelsS60 (2011–), S80 (2007–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)
What does this fault code mean?
The SUM keeps receiving data from the brake control module (BCM) over CAN. The fault code is set when the expected message from the BCM about yaw angle and lateral acceleration is missing.
Possible causes
- Contact resistance or oxidation in the connectors
- A break in one of the wires in the CAN network
- One of the wires in the CAN network is short-circuited to ground
- One of the wires in the CAN network is short-circuited to voltage
- The wires in the CAN network are short-circuited to each other
What you can do
- 1Read the fault codes in all control modules, clear them and road test the car to see whether they return
- 2Check that the relevant fuses are intact; their locations are in the owner's manual
- 3Check that the connectors in the CAN network are firmly fitted and not corroded
- 4Inspect the wiring for breaks, chafing and pinch damage, especially where it moves
- 5Has anything recently been done to the car? Tell the workshop if you take it in
- 6Have a workshop with diagnostic equipment check communication with the brake control module and the CAN network
Symptoms you may notice2
- A message appears in the information display
- The Four-C function does not work
What the fault can affect1
- The Four-C function is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.