P283DShift Fork C 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
- P283D reports the fork C input stuck low. In the Corvette dual-clutch gearbox GM feeds the rod 3 sensor from reference B rather than reference A, so its enable test watches that second 5 V rail and pauses while P0652 or P0653 are present. Within those limits the code sets after 150 ms if no pulses are seen and the pin stays below 2.0 V, or if the duty cycle falls under 8 %; it is classed Type A. For rod sensor 3 of the TR9070, Ford reports a zero-stuck input whose pulse width falls short of the window. Mercedes-Benz interprets P283D00 on the 8G-DCT as a fork C sensor shorted to ground. Because rods 3 and 4 share reference B on the Corvette, a supply fault there would also disturb fork D.
- What you may notice
- Limp-home mode with warning lamp
- Gears of fork C unavailable
- Possibly further fork D codes if the shared supply is affected
- Likely causes
- LikelyFork C signal line shorted to ground in the gearbox harness
- PossibleFork C sensor no longer switching its output
- RareDamaged supply wire from reference B to the sensor
- 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: €150 – €2,500
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.