p0088 and limp mode new guy

[sindo]

hi guys im kind of new to the diesel scene and defently new to the site

im having a little bit of a problem with a truck i just bought

its a 2008 f-350 crew cab 6.4l 180k miles
doesnt seem to have any mods

i picked it up on thursday last week from a local dealer which seemed to have gotten it from an action in texas since i do have its car fax and it had its regular maintance done there.
my father has the same truck but with 103k miles and i do his maintance oil changes mainly.

so naturaly i did my oil change, oil and filter and both diesel filters

i primmed the fuel system to get rid of a much air as possible before i cranked it up.

it cranked up fine for about 10 seconds when it died out first thing i thought was o boy didnt prime it enough. so did it a couple of times and turned it on again no problem. i did noticed when the car died a small wrench appeared on the display.

i was driving the truck after all this and noticed i have about half power i thinks its called limp mode. i figured it had to do with the fuel system. no check engine light that hole day. the next day no problem truck had full power no issues till about 30 minutes into the drive i stepped on it and no power again i figured i was on limp mode again... but this time the check engine light went on since i have no tuner or anything i went the my local car shop discount auto parts and got a code reader and it read p0088 Rail/System Pressure - Too High.... i reset the code figuring maybe it was some dirt or something got the sensor. it hasnt came on again. but i am still on limp mode till i turn the car off then back on

Ps. i did noticed a sight glass with coolant in it and it seems to be low. could this cause the problem ??
and i have never had this problem with my fathers truck


thank you in advance for all you help
and sorry for any ignorance on my part.

[04hdfatboy]

For some reason the posts we made this morning disappeared. Anyway when you changed your fuel filters did you go with motorcraft or racor? If not i would change them again with the motorcraft brand. If you did it is probably your high pressure fuel pump.

[sindo]

Yes they were motorcraft I bought them at the ford dealer.... Anyway it could be something different a sensor maybe .... As you can see I'm trying to stay away from the high pressure pump idea

Thank you

[04hdfatboy]

I am not trying to kill your hopes but i dont think its a sensor. Usually its a valve that is in the HPFP but you have replace the HPFP. You can not change the valve.

[brewmaster gerber]

if you have a chip as in the edge ect. unplug it this should make it go out of limp mode. it could be bad chip or just bad connection

[Big Angry Hillbilly]

My bet is HPFP, if the truck is stock/not tuned you can have it flashed to the latest calibration to address this code.

If it's at the latest calibration, and still throwing this code - I think we just figured out why it was at the auction.

[sindo]

I don't know if it's flashed .... How
Could I find this out and who could do this ??

[Big Angry Hillbilly]

Dealer or anyone with a current IDS subscription and the appropriate hardware.

[drunk on diesel]

or borrow an H&S tuner, load it, and load back to stock