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Home >> GMC >> 1995 >> Forward Control 4.3 Z, Standard >> Repair and Diagnosis (Single Page) >> Transmission >> Automatic Trans >> Automatic Transmission Diagnosis - 4L80-E >> Diagnostic Charts - Gasoline >> DTC 39, TCC Stuck Off >> Diagnostic Aids

Diagnostic Aids

If TCC is mechanically stuck on, vehicle speed is zero MPH, brakes are applied and D2 is selected. TCC fluid will mechanically apply TCC causing an engine stall.