CODE 54

1993 GMC C1500

Tiny

1wwall

August, 28, 2009 AT 1:12 PM

Engine Performance problem
1993 GMC C1500 V8 Two Wheel Drive Automatic 191000 miles

When I start engine I have to hold the throttle open for it to run. It runs choppy and pops back through throttle body. It has code 54 stored (low fuel pump circuit voltage) what could cause this? Thanks

FOUND 11 RELATED QUESTIONS

3 Answers

Tiny

merlin2021

August, 28, 2009 AT 3:56 PM

Code 54 will set if ECM does not see 12 volts on fuel pump signal voltage monitor during the first 2 seconds after ignition is turned on.
Is this a 5.7? 5.0? The diagram below is 5.7 circuit.


http://www.2carpros.com/forum/automotive_pictures/62217_Code54_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_54a_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_54b_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_54c_1.jpg



http://www.2carpros.com/forum/automotive_pictures/62217_54d_1.jpg


This chart is for both!

Tiny

emersontasha

April, 24, 2012 AT 7:21 PM

Thanks for the info hopefully this will help me with the problems with this truck. Again thanks

Tiny

merlin2021

May, 2, 2012 AT 7:44 AM

K

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