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 at PCM/TCM and transmission pass-thru connector.

Fig 1: Code 73 Schematic (Diesel) Pressure Control Solenoid (Current Error)

Fig 2: Code 73 Schematic (Gasoline) Pressure Control Solenoid (Current Error)

Fig 3: Code 73 Flow Chart Pressure Control Solenoid (Current Error)