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Home >> GMC >> 1992 >> Forward Control 5.7 K, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission - Overhaul - 4L80-E >> Trouble Shooting >> Symptom Diagnosis >> 4th Gear Starts

4th Gear Starts

Solenoid "B" stuck on. Dirt in filter, PCM or TCM signal wire grounded. Possible trouble Code 86.

NOTE: Digital ratio adapter receives signals from electronic speedometer and sends them to PCM/TCM.
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