VOLVO
CEM-B10B411 - Daytime Running Light Left. General Electrical Failures. Circuit short to ground
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
2 modelsV40 (2013–), V40 Cross Country (2013–)
Show models by year and engine (2)
What does this fault code mean?
The CEM feeds the daytime running lights and watches the voltage on their wires. The fault shows that the supply to the left daytime running light is too low, which can be caused by a short to ground in the supply wire.
Possible causes
- The supply wire to the left daytime running light is shorted to ground
What you can do
- 1Read off and note the code, clear it and drive with the daytime running lights on to see whether it returns
- 2Check that the fuse for the daytime running lights is intact
- 3Check that the connector to the left daytime running light is fully engaged and not corroded, and that the cable is not chafed
- 4Use a multimeter (ignition off, connector unplugged) to check that the supply wire to the left daytime running light has no connection to ground
- 5If you have a diagnostic tool, activate the daytime running lights with the tool and check whether the left one comes on
- 6If the fault remains, have a workshop check the wiring to the left daytime running light
Symptoms you may notice3
- Yellow warning symbol and text message in the display
- The front fog lights or daytime running lights do not work
- The bulb failure warning in the instruments comes on or behaves abnormally
General guidance for car owners. Diagnosis on the car can point to a different cause.