OBD
P081D
Neutral Input Circuit
What it means
P081D means Neutral Input Circuit.
Check these first
- A failed neutral input switch
- Open or short in the neutral input circuit
- Corrosion in the neutral input connector
- Incorrect transmission fluid level or type
- A fault in the transmission control module neutral logic
What to do next
- Inspect the neutral input switch and connector
- Test the neutral input circuit for voltage and continuity
- Check the transmission fluid level and type
- Read neutral and range position live data
- Replace the neutral input switch if faulty
- Clear the code and retest
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Updated
Generic SAE J2012 definition. Last updated 2026-10-10.