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Home >> GMC >> 1994 >> C3500 HD 6.5 F, Standard >> Repair and Diagnosis >> Engine Performance >> System >> Engine Controls - Tests W/Codes - Electronic Transmission >> Trouble Code Charts >> Code 74, Transmission Input Speed Error >> Diagnostic Aids

Diagnostic Aids

Check for poor connections in PCM/TCM related circuits.

Fig 1: Code 74 Schematic (Diesel) Transmission Input Speed Error
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Fig 2: Code 74 Schematic (Gasoline) Transmission Input Speed Error
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Fig 3: Code 74 Schematic Flow Chart Transmission Input Speed Error
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