VOLVO
CEM-5A10 - Blower fan motor. Blocked
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 sends diagnostic information to the CEM. If the motor reports that the fan wheel is blocked, the code is set. The cabin blower then cannot start, and no cooling comes from the air conditioning.
Possible causes
- A blocked blower fan motor
- The ground wire to the blower fan motor is shorted to supply voltage
- The diagnostic signal wire is shorted to supply voltage
- Contact resistance
What you can do
- 1Check that the fan wheel in the climate system has free space and nothing blocks it. With the car off, feel by hand that the wheel turns freely
- 2With the ignition on, check whether the blower fan starts. If it does not, the fault is probably permanent
- 3Use a multimeter to check that the wires between the CEM and the fan have no break or short to supply voltage
- 4If the wheel turns freely but the fault remains, have a workshop check the fan motor
- 5After the work, clear the code and check that the blower fan works
Symptoms you may notice3
- The blower fan does not work
- Poor air flow
- No cooling from the air conditioning
What the fault can affect2
- The blower cannot start while the fault stays
- The air conditioning compressor is not allowed to start
General guidance for car owners. Diagnosis on the car can point to a different cause.