Powertrain
generic / SAE
P081D
Neutral Input Circuit
General electrical fault on the Neutral input circuit — used by ECM/PCM to detect Neutral and adjust idle speed and start enable.
SystemPowertrain
Typegeneric / SAE
GroupP0
Range / number8 / 1D
Possible causes
- Open or shorted neutral input wire high
Symptoms
- Check engine or transmission warning light on
- Harsh, delayed, or missing shifts
- Possible limp mode (locked in one gear)
- Slipping or shuddering during gear changes
Inspection / repair
- Difficulty: medium
- DIY: possible
- Estimated cost: 60–300 €
- Estimated time: 0.3–1.5 h
- Component: neutral input circuit
- Component: wiring harness
- MIL / check engine light
Sources
References
sae:J2012