VOLVO
CEM-8F37 - turn signal lamp. Faulty signal
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsC30 (2007–2013), C30 Electric (2011–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
What does this fault code mean?
The central electronic module (CEM) has registered a signal that is too high, or no signal at all, on the driver circuit for the left-hand indicator. The left-hand indicator then does not work.
Possible causes
- Short to supply voltage in the signal wire
- Break in the signal wire
What you can do
- 1Flash the left-hand indicator with the ignition on: if it does not light the fault is permanent, and if it lights the fault has occurred before
- 2Clear the code and check whether it returns with the ignition on
- 3With the ignition off, use a multimeter to check that the signal wire to the left-hand indicator has no break
- 4With the ignition off, use a multimeter to check that the signal wire has no contact with voltage
- 5If the fault returns, have a workshop repair the wire
Symptoms you may notice1
- The left-hand indicator does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.