VOLVO
CEM-8A0A - Extra lamp relay. Signal missing. 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 auxiliary light relay must not be activated for this code to be set. CEM then registers that the auxiliary light circuit is not closed, meaning there is a break. The fault is intermittent and may have occurred earlier without being active now.
Possible causes
- Open circuit in the auxiliary light relay circuit
What you can do
- 1Check that the auxiliary light relay is correctly fitted
- 2Check the connections to the relay for loose connections and corrosion
- 3Use a multimeter to check that the wire to the relay has no break
- 4Remedy what is found and check that the auxiliary lights work again
Symptoms you may notice1
- Front lamps do not work
General guidance for car owners. Diagnosis on the car can point to a different cause.