Powertrain, generic (extended)

P2733 Pressure Control Solenoid F Stuck On

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

P2733 is the reverse case of P2732: valve F keeps pressure on its clutch after the TCM has commanded it off, so the off-going element still carries torque during the shift. GM checks this on its nine-speed units by watching C6 slip while shifting. If slip stays below 50 rpm for 0.8 s during power downshifts or 0.15 s on any other shift, one failure is counted; three of them give a Type A fault in one trip (18OBDG04, 20OBDG03A). GM shares the logic with P2731, which covers the same check in first gear. Bulletin 21-NA-169 for low-mileage 9T45/50/60 units lists P2731 to P2733 together and, with clean fluid, renews the solenoid assembly together with the valve body. Drivers notice tie-up, flare or harsh shifts.

Likely causes

Solenoid F held open mechanically (solenoid body)
Debris holding the regulator valve in the apply position
Restricted clutch exhaust passage

Symptoms

  • Tie-up or bind-up feel during shifts
  • Harsh shifts or engine flare
  • MIL on and fail-safe gear

Repair estimate

DifficultyShop_onlyWorkshop job
Parts and labour€400–5,000
Time2–14 h

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

Parts involved

pressure control solenoid fvalve body

Related codes

P2731P2732P2715P2724

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