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Old 03-02-2011, 10:28 AM   #1
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Default P0191 Code

I'm new to this site and I'm looking for a little advise. I recently got a check engine light and had the diagnostics run on my truck (2004 F150 Lariat, 5.4). The diagnostics came back as Error code P0191. The truck still runs as if nothings wrong. I've seen other posts about their trucks being dead in the water and the resolutions to their problem. Do any of you know what could be the issue with my truck....I'm assuming the fuel pump is okay since the truck runs fine? Any suggestions would be greatly appreciated.

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Old 03-02-2011, 10:32 AM   #2
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p0191 is a fuel rail pressure sensor code, check this thread:


and from others thread:

"You may want to check out the Fuel Pump Driver Module (FPDM) itself, they're notorious for going bad. Our trucks don't have a return in our fuel system, so that module is responsible for adjusting the fuel pump to maintain the pressure. Easy access, just lower the spare tire, two bolts and you're done. "

" So, my 2004 F150 kept stalling on me and i couldnt figure out whatr was wrong with it so i started with the following..after replacing my fuel filter, then my fuel pump...estimated costed of a little over $550, i finally took it to a mechanic and the problem was the fuel pump module. so if ever you run into this problem check this first, its located above the spare tire and its a black box with an aluminum plate on the bottom that is bolted onto the steel frame, and since im up north salt and what not works its way in between these to metal and it corroides the aluminum plate and reveals the electronice circuit board which communicates with the fuel pump, onces this gets wet it shorts out and makes your truck stall. so if anyone runs into this problem, check out your fuel pump module. Hopes this saves some of you some money, unlike myself."
2005 F150 SuperCrew Lariat 5.4L V8 Triton 4x2
I survived the change of broken spark plugs in the F150....
But my transmission didn't make it to 75000 miles....
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Old 03-02-2011, 10:39 AM   #3
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I'll check that out....thanks for the quick reply.

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Old 03-02-2011, 11:29 AM   #4
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I just changed the FPDM on my truck it's on the frame above the spare tire. You can only get it at ford it's around 150 dollars and takes about 15 minutes to change. Be sure to under coat the frame where it mounts so the FPDM doesn't corrode again. My truck was saying the same code and that fixed it.
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