VOLVO
CEM-5A12 - Blower fan motor. Over heated
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)
Show models by year and engine (11)
- Volvo C30 (2007–2013)2007–2010
- Volvo C30 (2007–2013)2011–2012All engines except: D4162T, D5204T, D5204T5
- Volvo C30 (2007–2013)2013Engine B4204S3, B4204S4, B5254T7 only
- Volvo C30 Electric (2011–2013)2011–2013
- Volvo C70 (2006–2013)2006–2010
- Volvo C70 (2006–2013)2011Engine B5244S4, B5254T7 only
- Volvo C70 (2006–2013)2012–2013Engine B5254T7 only
- Volvo S40 (2004–2013)2004–2010
- Volvo S40 (2004–2013)2011–2012All engines except: D4162T, D5204T, D5204T5
- Volvo V50 (2004–2013)2004–2010
- Volvo V50 (2004–2013)2011–2012All engines except: D4162T, D5204T, D5204T5
What does this fault code mean?
The blower fan motor has sent a signal to the central electronic module (CEM) that it is overheated, and the fault code is then stored. Overheating can be caused by the motor working hard, for example if the fan wheel is blocked or the motor is damaged. The fault is checked by running the fan, which shows whether it is still present.
Possible causes
- Damaged fan motor
- Blocked fan wheel
What you can do
- 1Read and note the code, clear it and run the blower fan to see whether the fault returns
- 2Check that the fan wheel in the climate system turns freely and that nothing is in the way, by turning it by hand with the ignition off
- 3Check that the fan motor connector is secure and free from corrosion
- 4Use a multimeter to check that the signal and diagnostic wiring between the control module and the fan has no break and no contact with voltage supply
- 5Remedy what is found, and have a workshop replace the fan motor if it is damaged
Symptoms you may notice3
- Blower fan does not run
- Blower fan runs at only one speed
- Air flow problem
What the fault can affect2
- Fan runs more slowly than normal
- Fan cannot start
General guidance for car owners. Diagnosis on the car can point to a different cause.