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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 & 2nd Gear Only

1st & 2nd Gear Only

Solenoid "B" stuck off or not connected to PCM or TCM. Dirt in filter, leaking "O" ring or no supply voltage to solenoid "B". Stuck 2-3 shift valve. Possible trouble Code 68, 81, 85 or 87.