P2842 code meaning
Shift Fork D Position Circuit Low
Powertrain system Generic code P28xx codes Check engine light
What P2842 means
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.
P2842 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyWorkshop only
- Typical labor1 to 6 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P2842
- Warning lamp, fork D gears blocked
- Transmission in emergency program
- Additional fork C code if the shared feed is at fault
Common causes of P2842
- Most likelyFork D signal wire shorted to ground or housing
- PossibleNo 5 V feed reaching the sensor
- PossibleFork D sensor internally failed
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Shift fork dShift fork position sensor dWiring harness
What each part of P2842 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 8 | Area: transmission. |
| 42 | The exact fault in that area. |
What to do next
- Note P2842 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P2842
What does P2842 mean?
P2842 means "Shift Fork D Position Circuit Low". P2842 sets when the fork D sensor signal collapses toward zero. It is a generic code, so it means the same on every make.
Is it safe to drive with P2842?
Drive gently and only to a workshop. With P2842 the car can go into limp mode (reduced power) to protect itself.
Will P2842 fail an emissions test?
Yes, it can. P2842 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P2842 to fix?
Difficulty: workshop only. A typical repair takes 1 to 6 hours of work. This is a job for a workshop.
Will P2842 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.