VOLVO
CEM-8D02 - Ignition lamp and high-mounted stop (brake) lamps Signal too high/Signal missing
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?
This code concerns the ignition lock lighting and the extra high-mounted brake light, which is fitted only on S60 and S80. On other models the REM (rear electronic module) handles it. The CEM has registered an open circuit or a short to supply voltage in one of the circuits.
Possible causes
- Open circuit in the circuit for the ignition lock lighting or the high-mounted brake light
- Short to supply voltage in the ignition lock or high-mounted brake light circuit
- Defective ignition lock lighting
- Defective high-mounted brake light
What you can do
- 1Find out which light is not working: the ignition lock lighting or the high-mounted brake light
- 2The high-mounted brake light should come on when the pedal is pressed and go off when it is released
- 3Check that the bulb in the affected light is intact
- 4Check the connections at the lamp and at the ignition lock lighting for oxidation and looseness
- 5Have a workshop check the circuit for voltage or open circuit and replace the lamp if it is defective
Symptoms you may notice2
- The brake lights do not come on when the pedal is pressed
- The brake lights stay lit constantly
General guidance for car owners. Diagnosis on the car can point to a different cause.