P287BShift Fork A Calibration Not Learned
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P287B says that the control unit has no valid learned reference positions for shift fork A and therefore cannot place it accurately in neutral or in its gears. On electrically shifted dual-clutch boxes such as Ford's DPS6, drum A moves the forks for 1st, 3rd and 5th; the TCM knows each detent only as an angle, roughly 10, 90 and 190 degrees, derived from hall sensors on a motor that turns 61.44 times per drum revolution. Ford's 2014 list carries P287B, then worded simply as shift fork calibration not learned, as an MIL code. GM's 2023 Corvette TCM shows the comparable logic under P287C, which checks stored synchronizer rod positions at start-up. Typical triggers are a new or reflashed TCM, an interrupted learn routine, or a fork position fault that makes the learn fail.
- What you may notice
- Odd gears engage late, roughly or not at all
- MIL or transmission warning
- Learn procedure with scan tool does not complete
- Likely causes
- LikelyTCM replaced or reprogrammed without running the fork learn
- PossibleLearn routine aborted by low voltage or other fault codes
- PossibleFork A position or drum fault preventing a valid learn
- RareWorn fork, drum groove or detent
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €80 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.