I have a 08 6.4 power stroke and when its loaded pulling a hill it will set a P0087 low rail pressure code and then it derates the power until the code clears of you turn it off for a few minutes it's only does it loaded so any help would be great Thanks Dave It has 124000 on it

 

Look for your HPFP as an issue. Check and change your fuel filters. Ensure all is clean. Shine a light in the fuel bowl and check for rust or metal contamination.

Might want to check your extended warranty.

Keep reciepts for your maintance.

 

the filters are new and they get changed on a regular maintence schedule and all looks clean i was thinking of the hpfp and there is a tsb for a code P0088 to replace the pump cause it all test good. i am looking at the cat and the DPF cause it is going into regen alot i test drove it 20 miles and came back to shop and checked the recored data the desired backpressue was about 30 psi lower than the actual filled it up with fuel and on the next test drive it regened again so im thinking that the exhaust might be the problem, and taking the exaust parts out to test drive will set a code i believe?

 

Yes if the parts are missing with out tuning the truck to shut off the regen it will cause problems.

 

that's what i was thinking does someone make a tuner for these so you can take out the DPF and CAT i have been looking but no real hard? Thanks for the info i will post my findings when i get this fixed

 

Spartan, H&S, DPF-R, SCT and probably a few more.

 

if rail pressure is low and your going in to regens alot odds are its a result of the extra soot load from the p0087 vs an issue with the pipes reaking havoc with the fuel system.
think about it

 

The OP had another thread in the SD forum about the same issue that was moved down here. I removed it, as there were no useful replies there and it would have just been confusing!

Secondly, is the truck completely stock right now?

 

I don't see in our scanner where the pid for the high pressure fuel,in our scanner its not a ford new gen or VCM its aftermarket we have an older new gen plus but it will only go to 2005, Yes the truck is all stock

 

pids are vcv pcv and frp.

 

we had this truck at the fore drealer and they told us to replace # 2 injector and when that didnt fix it the said to replace high pressure fuel pump and that didnt fix the problem the repair that fixed it was an updated flash of the ecm

 

were you able to get your trucks problem fixed? I'm currently having the same issue as well with my truck. Can seem to find any kind of solid info on it on what's really going on. Any help would greatly be appreciated. Thanks

 

The fix will be a new HPFP. The VCV that is attached to the HPFP is bad.