VOLVO
CEM-B11D914 - Vehicle Battery. General Electrical Failures. Circuit short to ground or open
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
7 modelsS60 (2011–), S80 (2007–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)
What does this fault code mean?
This fault code only applies to cars with automatic engine start/stop. The CEM monitors the voltage from the secondary battery, and the fault is stored when the value is wrong for too long. Common causes are poor connections, a damaged fuse, or a weak or damaged battery.
Possible causes
- Contact resistance or oxidation in the connections
- Damaged fuse for the power supply
- Open circuit in the supply wire from the secondary battery
- Open circuit in the earth wire of the secondary battery
- Poorly charged battery or corroded connection cables
- Damaged battery
What you can do
- 1Check that the battery is fully charged and is not swollen or leaking
- 2Check the connections to the secondary battery: corroded or loose terminals should be cleaned and tightened
- 3Check that the fuse for the power supply from the secondary battery is intact
- 4Check the earth wire from the secondary battery for breaks and loose connectors
- 5If the fault returns after these checks, have a workshop with diagnostic equipment check the battery and the wiring
Symptoms you may notice2
- The automatic start/stop function does not work while driving
- The automatic start/stop function does not work at idle
General guidance for car owners. Diagnosis on the car can point to a different cause.