P2845Shift Fork A Position Sensor Incorrect Neutral Position Indicated
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2845 means the fork A sensor reports neutral although the gearbox state says a gear is engaged, or it reports an engaged position where neutral is expected. Public manufacturer documentation for P2845 is lacking, and CARB 13 CCR 1968.2 only asks that transmission inputs be checked for plausibility. How such a check works is visible in GM's 2023 Corvette dual-clutch table: the module learns neutral and engaged positions for every rod and, with no shift force applied, expects the reading to stay inside tolerance bands around them, but it stores deviations under other codes. A shifted sensor magnet, a worn fork or lost learned values after a repair are likely triggers; a relearn with a scan tool is the first step, followed by a mechanical check.
- What you may notice
- Gear display shows N while a gear is engaged, or the reverse
- Shifts refused, transmission in limp-home mode
- Warning lamp on
- Likely causes
- LikelyNeutral position not learned or lost after repair or software update
- PossibleSensor magnet or target shifted on the rod
- RareWorn fork or detent changing the neutral position
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Hard · Usually a job for a workshop.Typical cost: €80 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.