VOLVO
ECM-621B - Engine cooling fan (FC). Signal missing
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
4 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), V50 (2004–2013)
Show models by year and engine (9)
- Volvo C30 (2007–2013)2007Engine B5254T3 only
- Volvo C30 (2007–2013)2008–2013Engine B5254T7 only
- Volvo C70 (2006–2013)2006–2007Engine B5254T3 only
- Volvo C70 (2006–2013)2008–2013Engine B5254T7 only
- Volvo S40 (2004–2013)2005–2007Engine B5254T3 only
- Volvo S40 (2004–2013)2008Engine B5254T3, B5254T7 only
- Volvo S40 (2004–2013)2009–2012Engine B5254T7 only
- Volvo V50 (2004–2013)2005–2007Engine B5254T3 only
- Volvo V50 (2004–2013)2008–2012Engine B5254T7 only
What does this fault code mean?
The engine control module (ECM) is missing a signal on the control circuit for the cooling fan. The cause may be a break in the signal cable or a damaged cooling fan control module.
Possible causes
- Open circuit in the signal cable
- Damaged cooling fan control module
What you can do
- 1Check the fuse for the cooling fan circuit
- 2Use a multimeter to check that the signal cable is not short-circuited to ground
- 3Check that the signal cable is not broken, particularly at the connectors and where it runs along the body
- 4With a diagnostic tool: activate the cooling fan with the ignition on and check that it starts
- 5If you find no fault in the wiring, have a workshop check the cooling fan control module
Symptoms you may notice1
- The electric cooling fan does not work
General guidance for car owners. Diagnosis on the car can point to a different cause.