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Home >> GMC >> 1993 >> Forward Control 7.4 N >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission - Overhaul & Testing - 4L80E >> Trouble Shooting >> Symptom Diagnosis >> 2nd & 3rd Gear Only

2nd & 3rd Gear Only

Stuck 1-2 shift valve. Solenoid "A" off. Dirt in filter, PCM or TCM not grounded, leaking "O" ring, no supply voltage to solenoid "A" or wire disconnected. Possible trouble Code 68, 82 or 85.