VOLVO
CEM-B108D23 - Start Button Circuit C. General Signal Failures. Signal stuck low
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
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?
The central electronic module (CEM) monitors the start button switches and expects an acknowledgement from the engine control module (ECM) over the CAN network once the start signal has been received. The fault shows that the switches close at the start button without any acknowledgement coming from the engine control module.
Possible causes
- The signal wire is shorted to battery voltage
- Open circuit in the signal wire
What you can do
- 1Read off and note the code, clear it and check whether it returns when you start the car with the start button
- 2Check that the fuses for the start button are intact
- 3Check that the connectors at the start button are fully engaged and not corroded, and that the cable is not chafed
- 4If you have a diagnostic tool, read the start button switches in live data and check whether they change when the button is pressed
- 5Use a multimeter (ignition off, connector unplugged) to check that the signal wire is not at battery voltage
- 6If the fault remains, have a workshop check the start button and the wiring
Symptoms you may notice1
- No noticeable symptoms for the driver
General guidance for car owners. Diagnosis on the car can point to a different cause.