Powertrain, generic (extended)

P2809 Pressure Control Solenoid G Stuck On

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

P2809 is the reverse case: valve G keeps acting although it should have released. On GM's 2016 eight-speed automatics, where G operates the converter lockup clutch, the converter shows almost no slip, between minus 50 and plus 30 rpm, while the clutch is commanded off; after 1.5 s and six fail counts the controller stores the code, with the MIL lit in the first trip. GM's 2023 Corvette dual-clutch table uses the same code when the differential lock valve stays hydraulically engaged, found during a recovery routine and logged as Type B. A converter clutch that does not release can stall the engine when stopping or make the car shudder at low speed. Contaminated fluid and a sticking valve are the leading suspects.

Likely causes

Valve G held open by debris
Contaminated or degraded transmission fluid
Mechanical fault inside solenoid G

Symptoms

  • Engine stalls or shudders when coming to a stop
  • MIL on
  • Differential stays locked on Corvette, tyre scrub in tight turns

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€250–4,000
Time2–10 h

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

Parts involved

pressure control solenoid gvalve body

Related codes

P2808P2807P0742P2818

References: gsi.ext.gm.com, gsi.ext.gm.com, law.cornell.edu.