Powertrain, generic (extended)

P2843 Shift Fork D Position Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2843 means the fork D position line is sitting near supply level. GM's 2023 Corvette table raises it for rod 4 when there is no pulse activity and more than 3.5 V on the pin, or when the duty cycle is above 92 %; after a 150 ms confirmation a Type A code is set. The monitor is held off while P0652 or P0653 report a reference B problem and whenever battery voltage leaves the 8.75 to 18 V band, which keeps low-voltage starts from producing false entries. Ford's TR9070 counterpart is a rod sensor 4 signal held at logic one with too long a pulse, and in Mercedes-Benz's 8G-DCT list P284300 describes a positive short of the fork D sensor. A signal wire in contact with a feed or an open sensor ground is the likely cause.

Likely causes

Fork D signal wire in contact with a feed wire
Open ground circuit of the fork D sensor
Internal short in the sensor pulling its output high

Symptoms

  • Fault message and warning lamp
  • Some even gears no longer selected
  • Limp-home operation

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€150–2,500
Time1–6 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

shift fork dshift fork position sensor dwiring harness

Related codes

P2842P2840P2844P2841P283E

References: gsi.ext.gm.com, fordservicecontent.com, static.nhtsa.gov.