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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 87, High Gear Ratio Error >> Diagnostic Aids

Diagnostic Aids

DTC 87 will set when trans. commanded gear is 3rd or 4th and trans. is mechanically in 1st or 2nd gear. DTC 81 is used to detect a 2-3 shift solenoid circuit malfunction.

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