P2866Shift Fork E Position Circuit High
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2866 is the high-level fault of the fork E sensor input. GM's Corvette TCM, reading rod 5 as a pulse-width signal, stores it as Type A in two situations: the line delivers no pulses and stays above 3500 mV, or the duty cycle climbs past 92 %. Either must persist for 150 ms, and the check pauses during cranking or when battery or reference voltage lies outside its window. On the Mercedes 8G-DCT the matching entry P286600 is described as a short to positive of the fork E sensor. Possible reasons are a signal lead touching a supply wire, an open ground of the sensor that lets the line float up, or a sensor that latches its output. P2865 is the low counterpart; a signal that pulses at the wrong rate sets P2867 instead.
- What you may notice
- Gears of fork E withheld, warning shown
- Engine lamp after a short drive
- Likely causes
- LikelyFork E signal wire touching a supply voltage wire
- PossibleOpen ground of the fork E sensor letting the signal float high
- RareSensor electronics holding the output permanently high
- 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: €100 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.