What does fault code CEM-8C15 mean?

Diagnostic fault code details for CEM-8C15 (Volvo S60 (2001–2009), Volvo S80 (1999–2006), Volvo V70 (2000–2008)). Repair service at OBD Tuning.

VOLVO

CEM-8C15 - Front fog lamp relay. Signal missing. Intermittent fault

System

Central Electronic Module (CEM)

Volvo models this fault code applies to

Applies to the following models:

5 models

S60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)

Show models by year and engine (5)

What does this fault code mean?

The code is set when the front fog lamp relay is not switched on and the CEM finds the front fog lamp circuit open. The fault is intermittent and may not be present right now.

Possible causes

Open circuit in the front fog lamp relay circuit

What you can do

1Check that the relay is correctly fitted and that its contacts are clean and tight
2Look for chafing, loose contacts or corrosion at the relay connections
3Use a multimeter to check that the wire from the relay to the fog lamps is not broken
4If the fault returns, have a workshop check the relay and the circuit

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.