VOLVO
ECM-P256400 - Turbocharger Boost Control Position Sensor A Circuit Low. General Failure Information. No sub type information
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
12 modelsC30 (2007–2013), C70 (2006–2013), S40 (2004–2013), S60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V50 (2004–2013), V60 (2011–), V70 (2008–), XC60 (2009–), XC70 (2008–)
Show models by year and engine (26)
- Volvo C30 (2007–2013)2011–2013Engine D4162T, D5204T, D5204T5 only
- Volvo C70 (2006–2013)2011Engine D5204T, D5204T5 only
- Volvo C70 (2006–2013)2012–2013All engines except: B5254T7
- Volvo S40 (2004–2013)2011–2012Engine D4162T, D5204T, D5204T5 only
- Volvo S60 (2011–)2011Engine D4162T, D5204T2 only
- Volvo S60 (2011–)2012Engine D4162T, D5204T3 only
- Volvo S60 (2011–)2013–2015Engine D4162T, D5204T3, D5204T7 only
- Volvo S80 (2007–)2011Engine D5204T2 only
- Volvo S80 (2007–)2012, 2015Engine D4162T, D5204T3 only
- Volvo S80 (2007–)2013–2014Engine D4162T, D5204T3, D5204T7 only
- Volvo V40 (2013–)2013–2014Engine D4162T, D5204T4, D5204T6 only
- Volvo V40 (2013–)2015Engine D4162T, D5204T6 only
- Volvo V40 Cross Country (2013–)2013–2014Engine D4162T, D5204T4, D5204T6 only
- Volvo V40 Cross Country (2013–)2015Engine D4162T, D5204T6 only
- Volvo V50 (2004–2013)2011–2012Engine D4162T, D5204T, D5204T5 only
- Volvo V60 (2011–)2011Engine D4162T, D5204T2 only
- Volvo V60 (2011–)2012Engine D4162T, D5204T3 only
- Volvo V60 (2011–)2013–2015Engine D4162T, D5204T3, D5204T7 only
- Volvo V70 (2008–)2011Engine D5204T2 only
- Volvo V70 (2008–)2012Engine D4162T, D5204T3 only
- Volvo V70 (2008–)2013–2015Engine D4162T, D5204T3, D5204T7 only
- Volvo XC60 (2009–)2011Engine D5204T2 only
- Volvo XC60 (2009–)2012Engine D5204T3 only
- Volvo XC60 (2009–)2013–2015Engine D5204T3, D5204T7 only
- Volvo XC70 (2008–)2011Engine D5204T2 only
- Volvo XC70 (2008–)2012–2015Engine D5204T3 only
What does this fault code mean?
The engine control module (ECM) receives too low a signal from the position sensor that controls the turbo's variable guide vanes. The position sensor tells the module where the vanes are. Without a valid signal, the module uses a fixed value for the turbo position instead.
Possible causes
- Loose connections
- Contact resistance or oxidation in the connections
- Signal wire shorted to ground
- Moisture in the air intake system
- Damaged position sensor
- Open circuit on the signal wire
What you can do
- 1Check that the connector to the turbo position sensor is firmly seated and free from oxidation
- 2Check the sensor wiring for chafing and breaks, and with a multimeter that it is not shorted to ground
- 3Check the air intake system for moisture or water
- 4If you have a diagnostic tool: read the position sensor value in live data and see whether it changes as the engine revs up
- 5Erase the code and test drive; if it returns after checking the connector, wiring and air intake, have a workshop check the position sensor
Symptoms you may notice2
- Check engine light comes on or behaves abnormally
- The car feels sluggish or lacks power
What the fault can affect2
- Exhaust gas recirculation (EGR) control stops
- The engine control module uses a fixed value for the turbo position
General guidance for car owners. Diagnosis on the car can point to a different cause.