VOLVO
CEM-8F04 - Turn signal lamp. Faulty signal
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 CEM monitors the turn signals and registers a faulty signal from the turn signal switch. The cause may be a damaged switch or a fault inside the steering wheel module (SWM). The indicators do not flash while the fault is present.
Possible causes
- Damaged turn signal switch
- Fault inside the steering wheel module (SWM)
What you can do
- 1Indicate in both directions with the indicator stalk and check that it returns to its centre position afterwards
- 2If the fault only comes now and then it may be intermittent. A test drive shows whether the code returns
- 3Clear the code and check whether it comes back
- 4Have a workshop with diagnostic equipment check the steering wheel module (SWM) and replace the switch if the fault returns
Symptoms you may notice1
- The indicators do not flash
General guidance for car owners. Diagnosis on the car can point to a different cause.