P283AShift Fork B Position Circuit Intermittent
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- P283A means the fork B signal is arriving, but not cleanly. For rod 2 of the Corvette dual-clutch gearbox GM measures the period of the sensor carrier and reacts once the equivalent frequency drops below 1500 Hz or rises above 2500 Hz for 150 ms, logging a Type A fault. Ford's 2024 summary files the matching frequency check of TR9070 rod sensor 2 under this number. On the DPS6 of the 2012 Focus and Fiesta it means something else: the second shift drum motor reports its rotation through three Hall elements, and P283A appears when their switching pattern comes in the wrong order. Mercedes-Benz has no intermittent fork B entry in its 8G-DCT list. Loose pins, damaged shielding and electrical noise are typical, so the fault comes and goes with temperature and vibration.
- What you may notice
- Sporadic warning lamp that clears after a restart
- Occasional hesitation or refused shift
- Intermittent engagement problems when pulling away (Ford DPS6)
- Likely causes
- LikelyLoose or spread terminal in the fork B sensor connector
- PossibleElectrical noise coupling into the signal line through damaged shielding
- PossibleFaulty Hall element in the second shift drum motor (Ford DPS6)
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Workshop only · 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.