Code 54, Fuel Pump Circuit

Code 54 will set if the ECM does not see 12 volts on the fuel pump signal voltage monitor during the first 2 seconds after ignition is turned on.

Fig 1: Code 54 Schematic (S & T Series) Fuel Pump Circuit - With Circuit Description

Courtesy of GENERAL MOTORS CORP.

Fig 2: Code 54 Diagnostic Flow Chart (S & T Series Only)

Courtesy of GENERAL MOTORS CORP.

Fig 3: Code 54 Schematic (Astro, Safari) Fuel Pump Circuit

Fig 4: Code 54 Schematic (C, K, R, V, G, & P Series W/O 4L80-E Trans) Fuel Pump Circuit

Fig 5: Code 54 Schematic (All Models W/4L80-E Trans. Except G Series) Fuel Pump Circuit

Fig 6: Code 54 Schematic (G Series W/4L80-E Trans.) Fuel Pump Circuit

Fig 7: Code 54 Schematic (3.1L) Fuel Pump Circuit

Fig 8: Code 54 Flow Chart Fuel Pump Circuit (Except S & T Series)