VOLVO
CEM-8C12 - Rear fog lamp switch. Signal too low. Intermittent fault
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
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 central electronic module (CEM) has registered a fault in the rear fog lamp switch. The fault is intermittent and may not be present right now, but the rear fog lamps do not work while it is active.
Possible causes
- Faulty rear fog lamp switch
What you can do
- 1Switch the rear fog button on and off a few times and check that the lamps light and go out as expected
- 2Clear the code and do a test drive to see whether it returns
- 3If the fault returns, have a workshop replace the switch
Symptoms you may notice1
- The rear fog lamps do not work
General guidance for car owners. Diagnosis on the car can point to a different cause.