1993 GMC C1500 CODE 54

1993 GMC C1500
191,000 MILES • V8 • 2WD • AUTOMATIC
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1WWALL
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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
Aug 28, 2009 at 1:12 PM
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MERLIN2021
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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.


https://images.2carpros.com/forum/automotive_pictures/62217_Code54_1.jpg


https://images.2carpros.com/forum/automotive_pictures/62217_54a_1.jpg


https://images.2carpros.com/forum/automotive_pictures/62217_54b_1.jpg


https://images.2carpros.com/forum/automotive_pictures/62217_54c_1.jpg


https://images.2carpros.com/forum/automotive_pictures/62217_54d_1.jpg

This chart is for both!
Aug 28, 2009 at 3:56 PM
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EMERSONTASHA
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  • 1 POST
thanks for the info hopefully this will help me with the problems with this truck. again thanks
Apr 24, 2012 at 7:21 PM
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MERLIN2021
  • ✓ASE Certified Mechanic
  • 17,250 POSTS
  • ASE Certified Mechanic
k
May 2, 2012 at 7:44 AM
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