VOLVO
CEM-5F36 - Flame sensor Short circuit to ground
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 flame sensor in the heater. A short to ground in the flame sensor line is treated as a fault by the control unit, and the code is set. The fault shows when the heater is active, and it causes poor interior heating.
Possible causes
- Signal wire short-circuited to ground
- Defective flame sensor
- Damaged flame sensor
What you can do
- 1Read and note the code, clear it and activate the heater with only the ignition on, then listen for a buzzing sound showing that the heater runs
- 2Check that the control unit connectors are secure and free from corrosion
- 3Use a multimeter to check the flame sensor signal wire for contact with ground (the body), testing one wire at a time
- 4If the wire is intact and the fault remains, a workshop should replace the flame sensor
- 5Test-run the heater and check that it runs steadily
Symptoms you may notice1
- Poor interior heating
General guidance for car owners. Diagnosis on the car can point to a different cause.