P2842Shift Fork D 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
- P2842 sets when the fork D sensor signal collapses toward zero. GM's 2023 Corvette table expects a pulse train from the rod 4 sensor and flags the circuit if pulses vanish with less than 2.0 V present, or if the duty cycle is lower than 8 %, both held for 150 ms; the resulting fault is Type A. In Ford's TR9070 summary the matching rod sensor 4 entry covers a too-narrow pulse and an input frozen at zero. Mercedes-Benz uses P284200 on the 8G-DCT for a fork D sensor shorted to ground. Since a missing sensor feed produces the same low picture, measure the 5 V supply at the connector first; on the Corvette that feed is shared with rod 3, so a combined P283D points to the supply rather than to one sensor.
- What you may notice
- Warning lamp, fork D gears blocked
- Transmission in emergency program
- Additional fork C code if the shared feed is at fault
- Likely causes
- LikelyFork D signal wire shorted to ground or housing
- PossibleNo 5 V feed reaching the sensor
- PossibleFork D sensor internally failed
- 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.