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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 >> 1st & 4th Gear Only (Manual 2nd & 3rd Only)

1st & 4th Gear Only (Manual 2nd & 3rd Only)

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