VOLVO
ECM-406C - Fuel tank system, leakage. Fuel tank filler cap missing
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
7 modelsS40 (2004–2013), S60 (2001–2009), S80 (1999–2006), V50 (2004–2013), V70 (2000–2008), V70 XC / XC70 (2001–2007), XC90 (2003–)
Show models by year and engine (10)
- Volvo S40 (2004–2013)2004Engine B5254T3 only
- Volvo S60 (2001–2009)2003Engine B5204T5, B5234T3, B5234T7, B5244T3, B5254T2 only
- Volvo S60 (2001–2009)2004Engine B5204T5, B5234T3, B5234T7, B5254T2, B5254T4 only
- Volvo S80 (1999–2006)2003Engine B5204T5, B5234T7, B5244T3, B5254T2, B6294S2, B6294T only
- Volvo S80 (1999–2006)2004Engine B5204T5, B5234T7, B5254T2, B6294S2, B6294T only
- Volvo V50 (2004–2013)2004Engine B5254T3 only
- Volvo V70 (2000–2008)2003Engine B5204T5, B5234T3, B5234T7, B5244T3, B5254T2 only
- Volvo V70 (2000–2008)2004Engine B5204T5, B5234T3, B5234T7, B5254T2, B5254T4 only
- Volvo V70 XC / XC70 (2001–2007)2003–2004All engines except: D5244T
- Volvo XC90 (2003–)2003–2004All engines except: D5244T
What does this fault code mean?
After refuelling, the engine control module checks that the fuel tank filler cap is in place, using a faster leak diagnostic. If it finds a leak after refuelling, this is interpreted as the filler cap being missing or not fitted properly, and the code is stored. The filler cap is usually the cause, but if the code for a major leak is also stored, that one should be troubleshot first.
Possible causes
- Fuel tank filler cap missing
- Fuel tank filler cap not properly tightened
What you can do
- 1Check that the fuel tank filler cap is on and fully tightened, especially after refuelling
- 2Check the sealing ring in the fuel tank filler cap
- 3Look up whether the major-leak fault code is recorded in the engine control module; if so, fault-trace that code instead
- 4If no major leak code is stored: have a workshop with diagnostic equipment run a quick test of the fuel tank system to confirm that the fault is gone
- 5Clear the code only once the filler cap is correctly fitted, and check whether it returns after the next refuelling
Symptoms you may notice1
- No noticeable symptoms for the driver
General guidance for car owners. Diagnosis on the car can point to a different cause.