VOLVO
ECM-662A - Glow relay control. Faulty signal
System
Engine Control Module (ECM)
Volvo models this fault code applies to
This fault code has different meanings depending on model, model year or engine. Select the meaning that applies to your car.
Applies to the following models:
4 modelsS60 (2001–2009), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (10)
- Volvo S60 (2001–2009)2006Engine D5244T4, D5244T5, D5244T6, D5244T7 only
- Volvo S60 (2001–2009)2007–2009Engine D5244T4, D5244T5, D5244T7 only
- Volvo V70 (2000–2008)2006Engine D5244T4, D5244T5, D5244T6, D5244T7 only
- Volvo V70 (2000–2008)2007Engine D5244T4, D5244T5, D5244T7 only
- Volvo V70 (2000–2008)2008Engine D5244T5, D5244T7 only
- Volvo V70 XC / XC70 (2001–2007)2006–2007Engine D5244T4 only
- Volvo XC90 (2003–)2006–2007Engine D5244T4 only
- Volvo XC90 (2003–)2008–2010Engine D5244T4, D5244T5 only
- Volvo XC90 (2003–)2011Engine D5244T18, D5244T4, D5244T5 only
- Volvo XC90 (2003–)2012All engines except: B5254T2, B6324S5
What does this fault code mean?
Although the fault code is named faulty signal, it applies to communication with the glow plug relay. The engine control module controls the glow plugs through the relay and stores the fault code when it detects a communication fault. The fault may be caused by poor contact in the connectors or a damaged relay.
Possible causes
- Contact resistance or oxidation in the connectors
- Damaged glow plug relay
What you can do
- 1Check that the connectors at the glow plug relay are secure and clean
- 2Check that the connectors have no looseness or oxidation, since contact resistance can cause communication faults
- 3Replace the glow plug relay if the connectors are sound but the fault remains
- 4Clear the fault code after the work and start the engine to see whether it returns
Symptoms you may notice1
- A message appears in the text display
General guidance for car owners. Diagnosis on the car can point to a different cause.