VOLVO
CEM-5F3F - Fuel 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 fuel pump in the parking heater. If the signal in the fuel pump circuit is too high, for example because of a short to voltage, the code is set. The fault shows when the heater is active and may stop the parking heater from working.
Possible causes
- Signal wire short-circuited to voltage supply
- Defective fuel pump
- Damaged fuel pump
What you can do
- 1Read and note the code, clear it and check that the heater starts with only the ignition switched on, with a buzzing sound from it
- 2Check that the fuel pump connectors are secure and free from corrosion
- 3Use a multimeter to check that the signal wire to the fuel pump has no contact with voltage supply
- 4If the wire is intact and the fault remains, a workshop should replace the fuel pump
- 5After the repair, check that the cabin heating improves
Symptoms you may notice2
- Poor heating in the passenger compartment
- Parking heater does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.