What causes GM code 54?

Failed fuel pump relay Open or corroded fuel pump wiring and ground Weak fuel pump drawing excess current On digital EGR models a solenoid 2 fault uses this same code

How do I fix GM code 54?

Listen for fuel pump prime with the key turned on Test fuel pump relay operation and replace only if it fails tests Check pump power and ground voltage drop with a meter Measure fuel pressure against specification On digital EGR models test the EGR solenoid 2 circuit as the alternate cause

54 Fuel Pump Circuit Low Voltage

Q: What does GM code 54 mean?

GM code 54. Fuel Pump Circuit Low Voltage. Applies to 1982-1995 GM cars and C/K trucks, Camaro, Corvette.

Make: GM (1982-1995)
Category: Powertrain - Fuel/Air Metering
Severity: Check Engine Light
Applies to: 1982-1995 GM cars and C/K trucks, Camaro, Corvette

How to read it

Code 54 reads as 5 flashes, pause, 4 flashes on the check-engine light. Jump terminals A and B on the ALDL connector with the key off, then turn the key on with the engine off and count the check-engine flashes.

What does GM code 54 mean?

54. Fuel Pump Circuit Low Voltage. This code sets when your vehicle computer detects fuel pump circuit low voltage.

Common causes of 54

Failed fuel pump relay
Open or corroded fuel pump wiring and ground
Weak fuel pump drawing excess current
On digital EGR models a solenoid 2 fault uses this same code

How to fix 54

Listen for fuel pump prime with the key turned on
Test fuel pump relay operation and replace only if it fails tests
Check pump power and ground voltage drop with a meter
Measure fuel pressure against specification
On digital EGR models test the EGR solenoid 2 circuit as the alternate cause