DTC P0088
Postmaster
Joined: Feb 2006
Posts: 3,201
Likes: 4
From: waynesville, mo.
There's 2 electronic solenoids on the HPOP, pressure control valve (PCV) and volume control valve (VCV). Neither is serviceable. So, nothing is wrong with the pump components, just an electronic solenoid. Ford issued a reflash that widens perameters on the valves, which sometimes works. It was an attempt to correct another of Navistar's problems.
Junior User
Joined: Apr 2013
Posts: 62
Likes: 0
fix
Just to throw this out there, (show you how much diagnostics matter), I had one throwing the p0088 code. Looked at the tsb, and ordered a pump. Put it on, and a short time later, it was back with the same code. I took a long test drive with the IDS, and the cruise control quit. I talked to the owner and he admitted it would do that. Think about this one, when it would do it, it would also dim the lights (that was important). In the pcm connector, pin 39 is the FRP (fuel rail pressure) pin 16 (next to 39 but above it) is the generator (13.5 volts). They were shorting together internally when hitting a bump, setting FRP too high, and dimming the lights (13.5 volts going to 5).
New User
Joined: May 2015
Posts: 10
Likes: 0
Ok. I have had mine back from the dealer for almost 3 weeks now. They did the reflash and found that the drivers side battery was having issues when it would get hot. Replaced both batteries. I have pulled my 15,000 pound toy hauler about 200 miles now with no issues.
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