P2863Shift Fork E Position Circuit
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P2863 is the general circuit code for the position sensor of a fifth shift fork, used where the module cannot or does not distinguish between low, high and erratic signals. Only transmissions with five forks need it, such as eight-speed dual-clutch units. Mercedes-Benz lists P286300 for the 8G-DCT (724.1) in its 2025 service information on guided diagnosis, described simply as a disturbed position sensor, next to its own entries P2864, P2865 and P2866 for malfunction, ground short and positive short. GM's Corvette dual-clutch software, which also has a fifth rod, skips this umbrella code and reports the electrical faults of rod 5 only as P2865, P2866 and P2867. Without a valid fork E signal, the module withholds the gears on that fork.
- What you may notice
- Gears on fork E blocked, drive continues in remaining gears
- Drive system warning in the instrument cluster
- Unusual shift sequence or skipped gears
- Likely causes
- LikelyPoor contact at the fork E sensor or module connector
- PossibleFork E position sensor failed internally
- RareSensor reference supply shared with other sensors disturbed
- 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.