VOLVO
ECM-P086B38 - Neutral Position Sensor "A" Circuit Range/Performance. FM (Frequency Modulated) / PWM (Pulse Width Modulated) Failures. Signal frequency incorrect
System
Engine Control Module (ECM)
Volvo models this fault code applies to
Applies to the following models:
8 modelsS60 (2011–), S80 (2007–), V40 (2013–), V40 Cross Country (2013–), V60 (2011–), V70 (2008–), XC60 (2009–), XC70 (2008–)
Show models by year and engine (8)
- Volvo S60 (2011–)2014–2015Engine B4204T10, B4204T11, B4204T12, B4204T15, B4204T9 only
- Volvo S80 (2007–)2014–2015Engine B4204T11, B4204T12, B4204T15 only
- Volvo V40 (2013–)2015Engine B4204T11 only
- Volvo V40 Cross Country (2013–)2015Engine B4204T11 only
- Volvo V60 (2011–)2014–2015Engine B4204T11, B4204T12, B4204T15, B4204T9 only
- Volvo V70 (2008–)2014–2015Engine B4204T11 only
- Volvo XC60 (2009–)2014–2015Engine B4204T10, B4204T11, B4204T12, B4204T15, B4204T9 only
- Volvo XC70 (2008–)2014–2015Engine B4204T11 only
What does this fault code mean?
The code concerns neutral position sensor A and indicates that the character of its signal is wrong: the frequency of the signal is incorrect. The sensor sends its signal as a modulated pulse or frequency signal, and the fault is checked with the engine running. The sensor measures the angle of the gear lever against the gearbox input shaft.
Possible causes
- Loose contact or oxidation in the connector
- Break in the signal wire
- Damaged neutral position sensor
What you can do
- 1Check that the fuses are intact. The locations are shown in the instruction manual or on the fuse list
- 2Check that the connector at the sensor is firmly seated and free from looseness and oxidation
- 3Use a multimeter to check that the signal wire to the sensor has no break
- 4If you have a diagnostic tool, check in live data that the sensor signal changes as the gear lever is moved, rather than staying still
- 5If the fault remains after these checks, have a workshop with diagnostic equipment check the sensor signal
Symptoms you may notice3
- Automatic engine stop-start does not work while driving
- Automatic engine stop-start does not work at idle
- Auto-start does not work
What the fault can affect1
- The automatic engine stop-start function is switched off
General guidance for car owners. Diagnosis on the car can point to a different cause.