What are the common causes of P086B?

Dirty or corroded neutral position sensor A connector. A failed neutral position sensor A. An intermittent open or short in the sensor A circuit. Worn neutral switch mechanical contact. Low or contaminated transmission fluid.

Inspect and clean the neutral position sensor A connector. Test the sensor A circuit for opens and shorts. Compare neutral position sensor A data with the range sensor. Check transmission fluid level and condition. Replace neutral position sensor A if the signal drifts. Clear the code and retest.

P086B

Neutral Position Sensor A Range/Performance

System: Transmission (P code)
Lamp: Check Engine Light
Category: Powertrain - Transmission

What it means

P086B means Neutral Position Sensor A Range/Performance.

Where it lives

For P086B, the description names the sensor as the part involved.

Check these first

Dirty or corroded neutral position sensor A connector
A failed neutral position sensor A
An intermittent open or short in the sensor A circuit
Worn neutral switch mechanical contact
Low or contaminated transmission fluid

What to do next

Inspect and clean the neutral position sensor A connector
Test the sensor A circuit for opens and shorts
Compare neutral position sensor A data with the range sensor
Check transmission fluid level and condition
Replace neutral position sensor A if the signal drifts
Clear the code and retest

Look up another code

Code or symptom

Enter a full code or a symptom. Press / to search. How to read a code

Type a code above, or start from a symptom or a common code.

Updated

Generic SAE J2012 definition. Last updated 2026-10-10.