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Home >> GMC >> 1995 >> Forward Control 4.3 Z, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission Overhaul - 4L80-E >> 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.