VOLVO
CEM-8FF0 - Rain sensor button. Activated too long
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 has logged that the rain sensor switch has been held active for too long. The rain sensor function then does not work.
Possible causes
- The rain sensor button has stuck in the pressed position
- Damaged rain sensor button
What you can do
- 1Check that the rain sensor button does not stick or jam in the activated position
- 2Press the button and release it: it should return to its position; if it does not, the button is damaged
- 3Clear the code and check whether it returns with the ignition on
- 4If the fault has only occurred once, it may be a disturbance at start-up, so follow up whether it returns
- 5If the fault returns, have a workshop replace the rain sensor button
Symptoms you may notice1
- The rain sensor function does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.