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Home >> Chevrolet >> 1994 >> Forward Control 7.4 N >> Repair and Diagnosis >> External Pages >> Different car >> Section 13 (Engine Controls - Tests W/Codes - Electronic Transmission) >> Trouble Code Charts >> Code 74, Transmission Input Speed Error >> Diagnostic Aids

Diagnostic Aids

WARNING: This page does not describe the selected car, but rather 10 other vehicles, including the 1994 GMC Yukon, 1994 GMC Suburban, 1994 GMC Pickup, 1994 GMC Cab & Chassis, and 1994 GMC C3500 HD. However, it is still accessible from the selected car via links, so may be relevant.

Check for poor connections in PCM/TCM related circuits.

Fig 1: Code 74 Schematic (Diesel) Transmission Input Speed Error
G94H66057
Fig 2: Code 74 Schematic (Gasoline) Transmission Input Speed Error
G94D38383
Fig 3: Code 74 Schematic Flow Chart Transmission Input Speed Error
G94I66058
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