VOLVO
ECM-402A - Fuel tank pressure sensor. Faulty signal
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
7 modelsC70 Cabriolet (1998–2005), C70 Coupé (1998–2002), S60 (2001–2009), S70 (1997–2000), S80 (1999–2006), V70 (1997–2000), V70 (2000–2008)
Show models by year and engine (10)
- Volvo C70 Cabriolet (1998–2005)2000Engine B5244S only
- Volvo C70 Coupé (1998–2002)1999Engine B5254S DENSO only
- Volvo C70 Coupé (1998–2002)2000Engine B5244S only
- Volvo S60 (2001–2009)2001–2002Engine B5244S, B5244S2 only
- Volvo S70 (1997–2000)1999Engine B5254S DENSO only
- Volvo S70 (1997–2000)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo S80 (1999–2006)1999–2002Engine B5244S, B5244S2 only
- Volvo V70 (1997–2000)1999Engine B5254S DENSO only
- Volvo V70 (1997–2000)2000Engine B5244S, B5244S2, B5244SG, B5244SG2 only
- Volvo V70 (2000–2008)2001–2002Engine B5244S, B5244S2 only
What does this fault code mean?
The engine control module receives a signal from the fuel tank pressure sensor that does not match what it expects. The sensor, the hoses in the fuel system or a major leak can give a wrong reading. The engine control module then assumes a fuel tank pressure of zero, which can affect the leak diagnosis.
Possible causes
- Defective hoses in the evaporative emission system
- Defective fuel tank pressure sensor
- Major leak in the fuel tank system
What you can do
- 1Make sure the filler cap on the fuel tank sits correctly, and that the sealing ring is intact and clean
- 2Look for leaks in the hoses and connections of the evaporative emission system, especially at loose joints
- 3Replace or repair damaged hoses and components where a leak is found
- 4Have you got a diagnostic tool: read the tank pressure in live data at idle and check that the value changes when you activate the canister purge valve
- 5If the fault remains after these checks, have a workshop with diagnostic equipment check the fuel tank pressure sensor
Symptoms you may notice1
- No noticeable symptoms for the driver
What the fault can affect1
- The engine control module assumes zero fuel tank pressure
General guidance for car owners. Diagnosis on the car can point to a different cause.