P2865Shift Fork E Position Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2865 means the fork E position input is stuck low. On GM's 2023 Corvette, whose rod 5 sensor sends a pulse-width signal, the TCM runs two Type A checks under this number: no pulses at all while the pin rests below 2000 mV, or a duty cycle under 8 %, each confirmed after 150 ms. The test is suspended while cranking, outside 8.75 to 18 V battery voltage, or when the sensor reference supply leaves its band. Mercedes-Benz names P286500 on the 8G-DCT plainly as a short to ground of the fork E position sensor. Look for a signal wire grounded in the harness, a sensor with an internal short, or a missing reference voltage. The high-side counterpart is P2866, the frequency fault P2867.
- What you may notice
- Warning lamp with fork E gears blocked
- Fault returns at once after clearing
- Likely causes
- LikelyFork E sensor signal wire shorted to ground
- PossibleFork E sensor with internal short or failed output stage
- RareSensor supply missing because of an open feed
- 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.