VOLVO
SUM-C112C13 - Mode Indicator 1. General Electrical Failures. Bus off
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 fault code is labelled bus off, but it concerns an open circuit in the circuit to mode indicator 1 in the Four-C switch. The driving-mode indication then fails to appear, and Four-C cannot be shown correctly on the switch.
Possible causes
- Poor contact from oxidation or contact resistance in the connectors
- Open circuit in the power supply wire to the mode indicator
- Open circuit in the ground wire to the Four-C switch
- The Four-C function switch is damaged
What you can do
- 1Check the connector at the Four-C switch for looseness or oxidation
- 2Use a multimeter to check that the wires to the mode indicator and the ground wire are not broken, with the ignition switched off
- 3Try the switch and see whether the driving-mode indication returns after the test drive
- 4If the wires are sound: have a workshop check the switch and replace it if needed
Symptoms you may notice1
- The driving-mode indication in the Four-C switch does not appear
General guidance for car owners. Diagnosis on the car can point to a different cause.