VOLVO
CEM-8C13 - Front fog lamp relay. Signal too high. Intermittent fault
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
What does this fault code mean?
The code is set when the front fog lamp relay is switched on and the central electronic module (CEM) finds the front fog lamp in contact with battery voltage. The fault is intermittent, so it may not be present at the moment.
Possible causes
- The front fog lamp relay circuit is short-circuited to supply voltage
What you can do
- 1Check that the fog lamp relay is correctly fitted and that its contacts are clean and tight
- 2Look for chafing or loose contacts at the relay wiring, especially if the electrical system has recently been worked on
- 3With the ignition off, use a multimeter to check that the wire to the relay has no voltage
- 4If the fault returns, have a workshop check the relay and the circuit, since intermittent faults can be hard to find
Symptoms you may notice1
- The front fog lamps do not work
General guidance for car owners. Diagnosis on the car can point to a different cause.