Please help. P2291 injector control pressure to low - Ford Powerstroke Diesel Forum
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Old 02-11-2014, 11:17 AM
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Please help. P2291 injector control pressure to low

I've been searching threads for a while can't seem to find one with the exact same issue. My truck ran fine yesterday approx drove 100 miles to camp stopped and restarted truck several times. This morning I went to leave the house cranked up like normal backed out of driveway accelerated and it didn't have any power acted like it was dying so I let of gas and backed into drive way and wrench came up on dash scanned with mini max dtc code p2291 was found truck cranks fine and will idle. I changed my fuel filters every 10000miles last changed 6000 miles ago I do drain water separator last time I drained it was last week did not see any water just diesel. Any suggestions will be appreciated.
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Old 02-11-2014, 04:06 PM
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Crazy question but is there a metal insert inside the hose going to the tank that you got to stick the nozzle though to fill up the fuel tank mine is missing and I'm wondering if this could effect anything it seems like it was there the last time I filled up but I'm not 100% sure
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Old 02-11-2014, 05:59 PM
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Had similar issue I battled for a few months. Mine wouldn't start usually. Ended up being the lift pump. Have you been experiences any fuel pressure surges? P2291 according to the Ford techs around here is usually the HP pump. Thats what they replaced on mine only to find that wasnt the issue it was the LP.

Do you have the stock HFCM?
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Old 02-11-2014, 06:01 PM
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Since its starts up seems to me the LP would be fine since the computer sees enough pressure to allow it to fire. But I could be wrong. The fill neck is metal. Need a little more info on your setup to try to figure something out.
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Old 02-11-2014, 06:14 PM
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It's funny that you replied as I finished reading all 9 pages of your problem. I bought my truck in 2010 with 80000miles on it. At 100000 I deleted egr and dpf installed mini max I believe every thing else is stock. At idle it runs 5.2ksi fuel pressure ipw is fluctuating from 470 to 520. What info would you need to help me. Thanks. I have not noticed any surges will driving I do not dog on her I'm to scared to tear it up. Just want it to last
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Old 02-11-2014, 06:19 PM
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Since I've had it oil changed every 5000 and fuel filters 10000 and drain hfcm once a month
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Old 02-12-2014, 04:53 PM
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Have you cleared the 2291 and saw if that was the only code you ever get?
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Old 02-12-2014, 05:34 PM
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Yes but I've only let it idle and reved the engine since I cleared the code and no codes have come on since. I have not had time to drive it but I am going to start again Friday I'm gonna drive it and see what happends. What do you think should I change my fuel filters
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Old 02-12-2014, 06:36 PM
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Are you in very cold area? If yes....do you use anti gel in your diesel? Not sure where you live but mine threw same code when the fuel gelled up on me in
-10F weather here in Missouri. Truck started and idled fine that morning....but drove down road about 6 miles and it cut out on me twice and threw p2291 code with "wrench" light on dash. I was able to limp off road onto parking lot and after 30 mins....truck started up and run ok. I got home and changed fuel filters and have had no issues since. I did have antigel (diesel kleen white btl) but it apparently didn't stop the gelling/waxing issue. Now I use Howes and have been consistently at or below freezing temps and single digits and negative temps for last 3 weeks without issues. Changes your filters....and pay close attention the the one in the separator....mine looked normal but once I removed the fine mesh outter covering...I saw some gel.
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Last edited by sugelle; 02-12-2014 at 06:43 PM.
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Old 02-12-2014, 07:02 PM
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No not cold here. Alabama. Thanks for info. Any suggestions are deeply considered and appreciated.
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