VOLVO
CEM-B109B11 - License Plate Light. General Electrical Failures. Circuit short to ground
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
9 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V60 Cross Country (2015–), V70 (2008–), XC60 (2009–), XC70 (2008–)
What does this fault code mean?
The central electronic module (CEM) supplies the number plate lighting and monitors the output. The fault shows that the supply wire to the lighting is shorted to ground, so the light does not come on.
Possible causes
- The supply wire to the number plate lighting is shorted to ground
What you can do
- 1Read off and note the code, clear it and check whether it returns when you switch the number plate light on
- 2Check that the fuse for the number plate lighting is intact
- 3Check that the connector at the number plate light is fully engaged and not corroded
- 4Use a multimeter (ignition off, connector unplugged) to check that the wire has no connection to ground (car body)
- 5If you have a diagnostic tool, activate the number plate lighting with the tool and check that it comes on
- 6If the fault remains, have a workshop check the wiring and the lamp
Symptoms you may notice2
- The number plate lighting does not work
- Message in the information display
What the fault can affect3
- The number plate light output is switched off during the operating cycle in which the fault is detected
- The output is switched off permanently after several operating cycles in which the fault was detected
- Clearing the codes or starting a new operating cycle resets the output
General guidance for car owners. Diagnosis on the car can point to a different cause.