Powertrain
generic / SAE
P256B
Engine Idle Speed Selector Sensor/Switch Range/Performance
The idle-speed selector input is electrically intact but the value does not match a valid preset — multiple positions or a non-mappable value. Often a sticky multi-position switch.
SystemPowertrain
Typegeneric / SAE
GroupP2
Range / number5 / 6B
Possible causes
- Contaminated rotary contact high
- Sensor element aged beyond calibration window low
- Sensor mounting loose - signal damping low
Symptoms
- Check engine light on
- Idle speed too high, too low, or unstable
- Possible stalling at idle or after cold start
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 60–350 €
- Estimated time: 0.3–1.5 h
- Component: idle speed selector switch
- MIL / check engine light
Sources
References
sae:J2012