VOLVO
CEM-4F00 - Reset 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 noted the reset button on the stalk held down too long. The code is then set, and the parking heater and the reset button may stop working.
Possible causes
- The reset button was held in too long
- The reset button has stuck in the pressed-in position
What you can do
- 1Make sure the reset button on the stalk does not stick or stay pressed. Press and release it several times
- 2If the button is stuck, clean it carefully, or have a workshop replace it
- 3With the ignition on, check that the parking heater works when started
- 4After the work, clear the code and check that the button works
Symptoms you may notice2
- The parking heater does not work
- The reset button does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.