Powertrain, generic (extended)

P2818 Pressure Control Solenoid H Stuck On

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2818 reports that valve H stays effective when it should be released. In GM's eight-speed table for the 8L90, H is the default valve: in Park at 400-900 rpm, with fluid between 0 and 40 °C and a converter clutch test pressure of 600 kPa, slip of 6 rpm or less for 0.5 s counts as a fail, and the MIL follows after two trips. Bulletin PI1405 repeats cold starts in that range and replaces the gearbox if the code returns; 15-07-30-002 instead reprograms the module against firm 1-2 and 3-1 shifts with P0606 or P2818. On the ten-speed H is the converter clutch valve; GM bulletin 24-NA-230 links a stuck-on clutch on 2024-2025 Silverado and Sierra 1500 to the engine stalling when D or R is selected, mostly due to the valve body.

Likely causes

Valve in the valve body sticking in the applied position
Early TCM calibration (GM 8L90 2015, reprogramming)
Internal transmission fault that persists when cold (PI1405)
Contaminated fluid holding the valve

Symptoms

  • Engine stalls when coming to a stop or when D or R is selected
  • Firm upshifts or downshifts, shudder
  • MIL on, code may set only at low fluid temperature

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€100–6,000
Time0–12 h

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

Parts involved

pressure control solenoid hvalve body

Related codes

P2817P2816P2809P0742P0606

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