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1993 GMC C1500 CODE 54

Tiny
1WWALL
  • MEMBER
  • 1993 GMC C1500
  • V8
  • 2WD
  • AUTOMATIC
  • 191,000 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
Friday, August 28th, 2009 AT 1:12 PM

3 Replies

Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
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://www.2carpros.com/forum/automotive_pictures/62217_Code54_1.jpg



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



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



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



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


This chart is for both!
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Friday, August 28th, 2009 AT 3:56 PM
Tiny
EMERSONTASHA
  • MEMBER
  • 1 POST
Thanks for the info hopefully this will help me with the problems with this truck. Again thanks
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Tuesday, April 24th, 2012 AT 7:21 PM
Tiny
MERLIN2021
  • MECHANIC
  • 17,250 POSTS
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Wednesday, May 2nd, 2012 AT 7:44 AM

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