VOLVO
SUM-0033 - Position sensor, suspension left rear. Signal missing
System
Suspension Module (SUM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007)
Show models by year and engine (7)
What does this fault code mean?
No signal comes from the position sensor at the left rear wheel. The sensor is mounted on a bracket in the body and reports the position of the rear wheel to the suspension control module, so that information is missing.
Possible causes
- Open circuit in the signal cable
- Open circuit in the ground lead
- The signal cable has contact with the power supply cable
- Poor contact in the connections
- Defective position sensor
What you can do
- 1Use a multimeter to check that the signal and ground leads to the position sensor at the left rear wheel are intact
- 2Check the connectors in the wiring to the position sensor for loose, corroded or chafed wires
- 3If you have a diagnostic tool: read live data for the left rear position sensor; if the value is missing, the signal is absent
- 4Check that the suspension system fuses are intact; the owner's manual shows where they are
- 5If the wiring is intact, the position sensor is probably defective. Have a workshop replace it
Symptoms you may notice3
- The general warning lamp lights
- Message in the display
- Four-C does not work
What the fault can affect1
- Four-C control is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.