DTC code 54, fuel pump relay - The 1947 - Present Chevrolet & GMC Truck Message Board Network

ChevyTech · 08-31-2014, 05:10 PM

My guess is, the fuel pump is going bad and it has damaged the fuel pump relay or wiring connections.

A code 54 happens when the computer does not see power on the circuit from the fuel relay to the fuel pump, when the computer is sending power to the relay to apply the relay.

Sometimes when the fuel pump is failing the currant flow through the pump goes up considerably. This tends to damage many of the parts of both of the fuel pumps redundant circuits melting and damaging the connection at the fuel pump, fuel tank sender,fuel relay, and wire harness.

08-31-2014, 05:10 PM	#2
ChevyTech Registered User Join Date: May 2004 Location: Minnesota Posts: 4,621	Re: DTC code 54, fuel pump relay My guess is, the fuel pump is going bad and it has damaged the fuel pump relay or wiring connections. A code 54 happens when the computer does not see power on the circuit from the fuel relay to the fuel pump, when the computer is sending power to the relay to apply the relay. Sometimes when the fuel pump is failing the currant flow through the pump goes up considerably. This tends to damage many of the parts of both of the fuel pumps redundant circuits melting and damaging the connection at the fuel pump, fuel tank sender,fuel relay, and wire harness. __________________ For those of you that are wondering why you are not getting replies to your thread: Did you give the model, year, engine, fuel system type, and transmission information? If it is modified from what came stock from the factory, let us know that too.



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