Powertrain, generic (extended)

P2833 Shift Fork A Position Circuit Low

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2833 reports a fork A position signal stuck at the low end. On the Corvette dual-clutch gearbox the rod 1 sensor sends a pulse-width signal; GM's 2023 table sets the code when no pulses arrive and the pin stays under 2.0 V, or when the duty cycle drops below 8 %, each confirmed for 150 ms, with the 5 V sensor supply in range and rated Type A. Ford's 2024 summary calls the same case on the TR9070 a pulse width below its window, input stuck at zero. Mercedes-Benz uses P283300 when the fork A sensor circuit is shorted to ground in the 8G-DCT. Because a supply fault can mimic this pattern, GM blocks the test while supply codes such as P0642 are present. The gearbox then can no longer place the gears on that rod reliably.

Likely causes

Signal wire of the fork A sensor shorted to ground
Sensor output stage failed low
Open signal line letting the input float low

Symptoms

  • Warning lamp and limp-home mode
  • Gears of one shaft locked out
  • Car may only pull away in a fallback gear

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 ashift fork position sensor awiring harness

Related codes

P2834P2831P2835P2832P2838

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