Powertrain, generic (extended)

P2834 Shift Fork A Position Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2834 is the high-side counterpart: the fork A position input sits at the upper limit. In GM's 2023 Corvette table the rod 1 sensor is flagged when pulses stop and the pin voltage stays above 3.5 V, or when the duty cycle climbs over 92 %; after 150 ms a Type A fault is stored, but only while the sensor supply lies between 4.5 and 5.5 V and the battery between 8.75 and 18 V. Ford's 2024 summary for the TR9070 describes the same condition as pulse width above its window, input stuck at one. On the Mercedes-Benz 8G-DCT the code means the fork A sensor circuit has shorted to positive. A signal wire touching the sensor supply or a sensor whose output transistor no longer switches are the usual explanations.

Likely causes

Signal wire shorted to the 5 V sensor supply or battery voltage
Sensor output transistor no longer pulling low
Lost sensor ground

Symptoms

  • Warning lamp with stored code
  • Shifts on the affected shaft blocked
  • Reduced driveability in limp-home mode

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

P2833P2831P2835P2832P2839

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