VOLVO
ECM-2A0B - Fuel temperature sensor. Signal missing
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
9 modelsC30 (2007–2013), C70 (2006–2013), 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 (14)
- 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)2006–2007Engine B5254T3 only
- Volvo S40 (2004–2013)2008Engine B5254T3, B5254T7 only
- Volvo S40 (2004–2013)2009–2012Engine B5254T7 only
- Volvo S60 (2001–2009)2006Engine B5204T5, B5244T4, B5244T5, B5254T2, B5254T4 only
- Volvo S80 (1999–2006)2006Engine B5204T5, B5254T2 only
- Volvo V50 (2004–2013)2006–2007Engine B5254T3 only
- Volvo V50 (2004–2013)2008–2012Engine B5254T7 only
- Volvo V70 (2000–2008)2006Engine B5204T5, B5244T5, B5254T2, B5254T4 only
- Volvo V70 XC / XC70 (2001–2007)2006Engine B5244T4, B5254T2 only
- Volvo XC90 (2003–)2006Engine B5254T2 only
What does this fault code mean?
The engine control module monitors the temperature signal from the sensor built into the fuel pressure sensor. The code is stored when the control module receives no signal at all from that sensor. The cause may be a broken signal or ground wire, a short in the signal wire, poor contact or a damaged sensor.
Possible causes
- Contact resistance or oxidation in the connections
- Signal wire shorted to supply voltage
- Signal wire shorted to ground
- Break in the signal wire
- Break in the signal ground wire
- Damaged fuel temperature sensor
What you can do
- 1Clear the code, start the engine and see whether it returns
- 2With a diagnostic tool, check the fuel temperature in live data with the ignition on. A missing value means the signal itself is absent
- 3Switch off the ignition and check the connector at the fuel pressure sensor, where the temperature sensor sits, for oxidation and contact resistance
- 4With the car switched off, use a multimeter to check that the signal wire and the ground wire are not broken
- 5If the connector and wiring are in order but the fault remains, have a workshop replace the fuel pressure sensor, which contains the temperature sensor
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.