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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 - Diesel >> DTC 86, Low Gear Ratio Error >> Diagnostic Aids

Diagnostic Aids

DTC 86 will set when trans. commanded gear is 1st or 2nd and trans. is mechanically in 3rd or 4th gear. DTC 81 is used to detect a 2-3 shift solenoid circuit malfunction.

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