Powertrain, generic (extended)

P283E Shift Fork C Position Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P283E is the high-side fault of the fork C circuit. GM's 2023 summary checks the Corvette rod 3 sensor for two signs: no pulses at all with the pin above 3.5 V, and a duty cycle above 92 %. Either one, held for 150 ms with reference B in its 4.5 to 5.5 V window and the engine not cranking, stores a Type A code. Ford lists P283E for TR9070 rod sensor 3 as a pulse width beyond the upper limit, input stuck at one. Mercedes-Benz uses P283E00 on the 8G-DCT for a fork C sensor with a short to positive. In practice a pinched harness where the signal touches a feed, water in a connector bridging pins, or a sensor that has lost its ground are the usual finds. Fork C gears stay unavailable until the circuit is repaired.

Likely causes

Pinched harness with the fork C signal touching a feed wire
Water in the connector bridging signal and supply pins
Fork C sensor without ground connection

Symptoms

  • Warning lamp and gearbox fault message
  • Fork C gears locked out
  • Jerky driving in the substitute program

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 cshift fork position sensor cwiring harness

Related codes

P283DP283BP283FP283CP2843P0653

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