VOLVO
CEM-5F3A - Water pump. Signal too high
System
Central Electronic Module (CEM)
Volvo models this fault code applies to
Applies to the following models:
5 modelsS60 (2001–2009), S80 (1999–2006), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (10)
- Volvo S60 (2001–2009)2001, 2005–2009
- Volvo S60 (2001–2009)2002All engines except: D5244T2
- Volvo S60 (2001–2009)2003All engines except: B5244S6, D5244T2
- Volvo S60 (2001–2009)2004All engines except: B5244S6, B5254T4, D5244T2
- Volvo S80 (1999–2006)1999–2002, 2005–2006
- Volvo S80 (1999–2006)2003–2004All engines except: B5254T2
- Volvo V70 (2000–2008)2000–2003, 2005–2008
- Volvo V70 (2000–2008)2004All engines except: B5254T4
- Volvo V70 XC / XC70 (2001–2007)2001–2007
- Volvo XC90 (2003–)2003–2015
What does this fault code mean?
The central electronic module (CEM) monitors the water pump in the parking heater. If the signal in the pump circuit is too high, the code is set. The fault shows when the heater is active, and the heating of the passenger compartment becomes poorer.
Possible causes
- Signal wire short-circuited to voltage supply
- Defective water pump
- Damaged water pump
What you can do
- 1Read and note the code, clear it and activate the heater to see whether the fault returns
- 2Activate the water pump with the heater running and listen for a buzzing sound showing that it runs
- 3Check that the water pump connectors are secure and free from corrosion
- 4Use a multimeter to check that the signal wire to the water pump has no contact with voltage supply
- 5If the wire is intact and the fault remains, a workshop should replace the water pump
Symptoms you may notice2
- Parking heater does not work
- Poor heating in the passenger compartment
General guidance for car owners. Diagnosis on the car can point to a different cause.