VOLVO
SUM-C1A0513 - Left Rear Height Sensor. 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?
No signal reaches the SUM from the height sensor at the left rear wheel. Because the height sensor shows the body's position, the Four-C function is switched off for as long as the signal is missing.
Possible causes
- Contact resistance or oxidation in the connectors
- A break in the signal wire between the height sensor and the module
- The height sensor has no power supply
- Open circuit in the ground wire to the height sensor
- Damaged height sensor
What you can do
- 1Read and note the code, clear it and road test to see whether it returns
- 2Check that the relevant fuses are intact; their locations are in the owner's manual
- 3Check the connector at the height sensor at the left rear wheel: it should be firm and clean
- 4Inspect the cable from the height sensor for breaks, chafing and loose clips
- 5Use a multimeter to check that the ground wire to the height sensor is connected to the body
- 6If the fault returns, have a workshop with diagnostic equipment check the height sensor and the wiring
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.