VOLVO
ECM-P022216 - Throttle/Pedal Position Sensor/Switch B Circuit Low. General Electrical Failures. Circuit voltage below threshold
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
7 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V70 (2008–), XC60 (2009–)
Show models by year and engine (20)
- Volvo S60 (2011–)2011Engine B4164T, B4164T3, B4204T6, B4204T7 only
- Volvo S60 (2011–)2012–2014Engine B4164T, B4164T2, B4164T3, B4204T7 only
- Volvo S60 (2011–)2015Engine B4164T, B4164T2, B4164T3 only
- Volvo S80 (2007–)2010Engine B4204T6 only
- Volvo S80 (2007–)2011Engine B4164T, B4204T6, B4204T7 only
- Volvo S80 (2007–)2012–2014Engine B4164T, B4164T2, B4204T6, B4204T7 only
- Volvo S80 (2007–)2015Engine B4164T only
- Volvo V40 (2013–)2013Engine B4164T, B4164T3 only
- Volvo V40 (2013–)2014–2015Engine B4164T, B4164T3, B4164T4 only
- Volvo V40 Cross Country (2013–)2013–2015Engine B4164T only
- Volvo V60 (2011–)2011Engine B4164T, B4164T3, B4204T6, B4204T7 only
- Volvo V60 (2011–)2012–2014Engine B4164T, B4164T2, B4164T3, B4204T7 only
- Volvo V60 (2011–)2015Engine B4164T, B4164T2, B4164T3 only
- Volvo V70 (2008–)2010Engine B4204T6 only
- Volvo V70 (2008–)2011Engine B4164T, B4204T6, B4204T7 only
- Volvo V70 (2008–)2012–2014Engine B4164T, B4164T2, B4204T7 only
- Volvo V70 (2008–)2015Engine B4164T, B4164T2 only
- Volvo XC60 (2009–)2010Engine B4204T6 only
- Volvo XC60 (2009–)2011–2012Engine B4204T6, B4204T7 only
- Volvo XC60 (2009–)2013–2015Engine B4204T7 only
What does this fault code mean?
The engine control module (ECM) has detected an electrical fault in the signal from throttle position sensor potentiometer 2 (circuit 2), where the voltage is too low. It may be caused by poor contact, a signal wire shorted to ground or broken, the supply to the potentiometers, or a damaged throttle unit.
Possible causes
- Poor contact with oxidation in the connections between the ECM and the throttle unit
- Signal wire shorted to ground or broken
- Supply to the throttle unit's two potentiometers broken or shorted to ground
- Damaged throttle unit
What you can do
- 1Read the code, clear it and road test to see whether it returns
- 2Check that the fuses are intact. Fuse locations are shown in the owner's manual
- 3Look at the connectors on the throttle unit and the engine control module for loose fit, corrosion and moisture
- 4Use a multimeter to check that the supply wire to the throttle unit is not broken and not shorted to ground
- 5If you have a diagnostic tool: read potentiometer 2 in live data with the ignition on, first with the pedal released and then pressed, and see whether the value changes
- 6If the fault remains, have a workshop measure the potentiometer resistance with diagnostic equipment. A replacement throttle unit needs adaptation, which the workshop carries out
Symptoms you may notice2
- The car feels poor to drive, with reduced performance and lack of power
- Warning symbol and text message in the display
What the fault can affect2
- The throttle position is instead worked out from potentiometer 1
- If codes are stored for both potentiometer 1 and 2, the power to the throttle motor is switched off and the throttle returns to its spring-loaded position
General guidance for car owners. Diagnosis on the car can point to a different cause.