DTC 54 - Pcm Fuel Circuit Error
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.
This DTC indicates a fault in the fueling circuit of the PCM is present. Check if DTC 17 is also stored. If DTC 17 is set, refer to DTC 17 chart first. If DTC 17 is not set, replace PCM. If PCM is faulty and must be replaced, TDC OFFSET must be programmed into the new PCM. When all diagnosis and repairs are complete, clear DTC's and verify for proper operation.