VOLVO
CEM-7A05 - Phone YES 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?
CEM reads the signal from the YES button for the phone on the steering wheel. If the button has been held on for too long, the fault code is set and the phone controls on the wheel stop working.
Possible causes
- The YES button has stuck in the pressed position
- Damaged YES button
What you can do
- 1If you have a diagnostic tool, read the button status in live data and check that it changes when you press and release the button
- 2Check that the YES button does not stick in the pressed position, and press it once to see that it springs back
- 3Clear the fault code and road test the car to see whether it returns
- 4If the button is damaged, a workshop should replace it
Symptoms you may notice1
- The phone controls on the wheel are not working
General guidance for car owners. Diagnosis on the car can point to a different cause.