VOLVO
ECM-404C - Fuel tank system, leakage. Major leak
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
8 modelsC70 Cabriolet (1998–2005), S40 (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 (11)
- Volvo C70 Cabriolet (1998–2005)2003–2005
- 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?
The engine control module tests the fuel tank system by pressurising it and seeing how quickly the pressure rises. The fault code is set when the leak is so large that it counts as a major leak, for example in the tank, the filler pipe, the filler cap, the canister, the valves or the hoses between them. The fault turns on the warning lamp, and the filler cap is the most common cause.
Possible causes
- Filler cap missing, or not fully tightened
- Major leak in the tank, filler pipe, canister, EVAP valve, leak diagnostic unit or the hoses between them
- Fuel level gauge not working, which may point to a fault in the central electronic module (CEM)
What you can do
- 1Check that the filler cap is tightened and that the seal is not damaged
- 2Check hoses and connections at the tank, the filler pipe, the canister and the EVAP valve visually for damage and loose parts
- 3If the fuel gauge in the instrument panel does not work, troubleshoot the central electronic module (CEM) first
- 4Have a workshop check the software in the engine control module on cars of model year 2004 to 2008 before the leak is searched for
- 5Have a workshop with diagnostic equipment run a quick test of the fuel tank system and search for the leak if it cannot be seen during the visual check
- 6Read the fault codes again after the repair and check that the fault does not return
Symptoms you may notice1
- Malfunction indicator lamp (MIL) is on
General guidance for car owners. Diagnosis on the car can point to a different cause.