VOLVO
CEM-4E25 - Malfunction indicator lamp (MIL). Signal too high
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 CEM checks the malfunction indicator lamp in the instrument panel. If the signal is too high, the code is set. The lamp may then stay lit all the time, or behave wrongly when the ignition is switched on.
Possible causes
- The power cable to the malfunction indicator lamp is shorted to supply voltage
What you can do
- 1With the ignition off, check that the malfunction indicator lamp goes out. If it stays lit, the fault is probably still present
- 2Check the fuse for the instrument panel. If it has blown, replace it once
- 3With the ignition off, use a multimeter to check that the power cable to the lamp has no short to supply voltage
- 4After the work, clear the code and check that the lamp goes out
Symptoms you may notice1
- The malfunction indicator lamp is lit
General guidance for car owners. Diagnosis on the car can point to a different cause.