VOLVO
SUM-U201313 - Switch Pack. 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 SUM reads a voltage from the three Four-C switches to decide which drive program has been selected. The fault code is set when there is a break in the switch circuit.
Possible causes
- Contact resistance or oxidation in the connectors
- A break in the wire from the switches
- Damaged Four-C switch
What you can do
- 1Read the code, note it and clear it, then road test the car
- 2Check that the relevant fuses are intact; their locations are in the owner's manual
- 3Check that the connectors at the switches are firm and free from oxidation
- 4Inspect the wire from the switches for breaks, chafing and pinch damage
- 5Use a multimeter to check that the wire from the switches has no break
- 6If the fault returns, have a workshop with diagnostic equipment check the switches and the wire
Symptoms you may notice1
- Drive program selection with the switches 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.