I too am having issues with P0088, High Pressure Fuel Rail. A little back ground, I have a 09 F-250 XLT 4x4, 6.4 with NO MOD’s, plane stock with 109000 miles. Oil changes every 5000 to 10000 miles depending on driving/towing, and every 10000-20000 for fuel filters. About 4 months ago I was pulling my 9000 Lbs trailer up a steep grade on I-5 out of LA when this all started. I lost power and my turbo boost would only go ½ way on the gauge. When I was limped up the hill the check engine light came on so I took the first exit, shut the engine off and started checking under the hood. Finding nothing, I started it up, and made my way back down the mountain to check the code. The truck had full power and ran great. The guy pulled P0088 and said if it happens again take it in. I continued on my trip to San Francisco with no problems on the way up there. On my trip home when I started to come back over the mountain to get to LA it started to happen again, so I pulled over shut it off and restarted, full power and no check engine light, made it home with no problems. About 1 week later had a load in the truck going to my storage unit when it happened again and light came on. Again when I turned off the truck and restarted all was fine. I cleared the code and truck ran great, and I did an oil change and fuel filters. I examined the fuel filters and no traces of metal particulars in them, and housing was clean. I tried to duplicate the problem over the next 3 month a load in the truck with no luck so I hooked up my trailer for a trip up to Washington. As I was heading out of LA, was starting up the mountains when the truck acts up and check engine light comes on. I pull over to reset and no luck, it stays in limp mode. I tried it 4 different, cleared the code, and letting it set turned off for a little longer each time, and every time when I would get ¾ boost I would go into limp mode. I turned around and made it home and took the truck to the Dealership the next week. They could not duplicate my problem, but since it had a P0088 code they knew there was a problem. The Tech could not figure out what was wrong so they called Ford and sent them all my readings, Ford said all looked good and to reprogram PCM and retest. I loaded the truck up and over the next week ½ tried to make it happen again with no luck, so loaded up my trailer with the truck bed still loaded and did a 150 mile trip going up and down hills trying to make it happen with no joy… its fixed. Well I think not. This weekend went on a camping trip up to the mountains, and when I got past the 3000 foot mark it happened. I pulled over and tried to reset it with no luck, I only had 15 miles left to go and another 4000 feet to go so I pushed on. I had good torque on the lower end but again could not get it past ½ boost and able to keep 30 MPH going up the hills. On the trip home I had full power and could not make it happen again. So it’s off to the dealership again to see what they say again.
As I am reading threw different forms on what it could be, the common denominator keeps coming up to the HPFP. On “TSB 11-4-22 6.4L - LACKS POWER - DTC P0088, Publication Date: April 27, 2011” it said to replace the HPFP and both the fuel volume control valve (VCV) and fuel pressure control valve (PCV). My question is could one of the two valves be my problem, and if so are they easy to get to or does the cab need to come off. Also could the turbo be the problem. I know that my turbo was originally off sync with the computer, so the tech thought that could be an issue. Ill put a new HPFP in if needed, but don’t want to throw parts at it if it’s not the true problem.
So any ideas to share with the dealership or thoughts would be greatly appreciated.

Thanks
Scott

 

I'm not an expert, but from reading about this code after my truck had one, it's all over the map including a potential bad wiring or bad programming.

To pinpoint the issue, I'd probably find a different well recommended diesel mechanic. It doesn't sound like that Ford dealer is very good at this type of problem. For sure if everything is replaced including the wiring, you'll likely fix it

If you want to stay with a Ford dealer, maybe do some searching here to find a recommended dealer for diesel work.

Good luck!

 

Thanks for the reply jimh425.
After doing some research both the fuel volume control valve (VCV) and fuel pressure control valve (PCV) are not serviceable.

My Tech was able to dupliacate the problem while driving it around and after looking at the data said my HPFP was starting to go...... So time for a new upgraded pump.

 

I wonder how they came to that conclusion. Not saying that isn't the problem, but what are the signs of a failing HPFP? Could there be too much heat generated at the turbos to cause problems with the pump?

Something you might want to get in the near future if you don't have one already, is an Edge Insight CTS. It is not a programmer. What it does is reads all the sensors on the engine and transmission. You can set it up to monitor whatever PID you wish. Fuel pressure is one that I monitor, as well as oil and coolant temps.

Assuming they pull the cab to change the pump, have them check the exhaust system for leaks. That's the time to fix anything like that, while the cab's off.

 

Thanks for the reply CampSpringsJohn. I talked to the Tech yesterday and he said the the fuel pressure was all over the place, which means ether the VCV or PCV valve is malfunctioning. Since those valves are not serviceable, i get a whole new pump.

Thanks for the tip on getting a Edge Insight CTS. I been thinking of getting something, and after this probem i think i will. I take it plugs into the OBD2 port?

 

Last year mine started surging at idle. That was the only time it did it. (this is when I started monitoring the High Pressure Fuel Line) The fuel pressure was bouncing between 4900psi to 5600psi. Replaced the High Fuel Rail Pressure Sensor, and that solved it.

 

Campspringsjohn, who in the northern Ky. area do you recommend for problems with 6.4 with surging. Mine is surging so bad when accelerating but not showing any code. Rail pressure sensor or HPFP not having any luck in Warsaw ky. area.

 

MPH Enterprises. They're on HWY 2228 just off the AA Hwy near the Pendleton/Bracken County Line

859-991-8337 Speak with Travis. He knows me quite well!