OBD-II code · Powertrain (generic)
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.
Is it safe to drive with P081D?
Usually safe to drive in the short term. Get it diagnosed when convenient, sooner if the car drives differently.
Common causes
- Most likelyOpen or shorted neutral input wire
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
Repair at a glance
- Difficulty
- Medium
- DIY friendly
- Often, with basic tools
- Typical labour
- 0.3–1.5 h
- Emissions test
- Usually unaffected
- Parts involved
- Neutral Input Circuit, Wiring Harness
Code data: OBDex open dataset (CC0). Labour times are typical ranges, not a quote.