Hi all,
I am getting an error code P2285 on my truck and have checked voltage to my IPC. KOEO it reads about .215 volts from the signal wire, while cranking it starts out around .35V and will get up to around .58V. I have read that you need .8V for the injectors to fire. Just looking for ideas. I am going to go out tomorrow and buy a high pressure gauge to see exactly what pressure the HPO is making. Its a 05 6.0 4x4 with 190,000 miles on it. Any help would be appreciated.

 

Welcome to FTE.

You have a high chance of finding the STC fitting on the HPOP leaking. There are other places that are prone to leakage (like the dummy plugs), but the snap-to-connect fitting is all too common on the 05's and up.

You have 190k which is fantastic! What repairs have you had done?

 

Oh yeah, by the way. I have exchanged the IPC with one from my work truck, same year and model. I just purchased the truck about a month ago mostly to tow my 5th wheel a few times a year. So I dont know all the things that have been fixed but it has a remaned turbo, the EGR cooler has been replaced and the FICM has been replaced as far as I know.

 

You are correct. You need to see a minimum of 0.8 volts for the truck to fire up. But the voltage reading you are getting, is well within the 0.15 to 0.35 volts spec. You need to monitor ICP volts, psi, ICP desired, and IPR duty cycle as you crank the engine over. I find it odd, that you are getting P2285 ICP sensor circuit low, and not P2290 or P2291.

And yes, bismic is correct. 2005 and newer model years will ALWAYS blow out the STC fitting on the pumps. Given your high mileage, I am surprised this hasn't been replaced yet.

 

Bismic, I have noticed on other boards that you seem to have a lot of knowledge with the 6.0. Can the HPOP trigger the P2285 error code? I was working through the "no start" from a different board last week when I was working on the IPC portion, hence the voltages from the IPC, when it started up and ran great again after having the exact problem it is having now. So I drove it and had the codes scanned which came up with the P2285. I drove it about the same miles yesterday when it happened, 15-20 miles, as I did last week when it happened. Stopped at a store on both occasions turned off the truck ran in and came back out, started the truck and headed down the road about 1/2 block shifted into third and lost some HP. Then the truck starts to blow black smoke and still down on power. Eventually it starts jerking and surging and will only have enough power to pull the truck along if the RPMs are kept around 2800. Anything lower it will surge and jerk enough to rattle your teeth out. Limped it the rest of the way home pulled on my road and had to slow for kids and it died and now wont start. I am fairly shallow in the pockets at this point and would like to fix it myself if at all possible.

 

I am going borrow a code scanner tomorrow and get a high pressure gauge to try to see if it is throwing any different codes now. Is the IPC sensor circuit low code for the signal wire or the power wire. I checked the power wire and it has 5.4 volts there. I also thought that, from what I have read, the P2285 was odd. But was not sure if it was sensing low voltage on the signal side due to possible low HPO pressure. Just trying to scramble to get it fixed with out throwing a bunch of parts at it. But like I said I do have a work truck of the same model and year that if needed I could swap parts to narrow it down. Also I dont have access to a scanner that will tell me everything I need to know. Also I just bought the truck about a month ago so as far as I know it may have been replaced before but really dont know.

 

From what you said earlier, you installed an ICP sensor from another vehicle on yours and it still acted up? Did I read that right? If so, did you install your sensor on the other truck as a test?

What Mike (I think) is saying is that the P2285 is more of a code for a bad sensor or a wiring issue. The other codes (P2290 or P2291) would be more indicatve of actual low pressure.

Have you inspected the harness and the wiring real closely? Are your batteries fully up-to-snuff?

 

I did swap out the sensors from one truck to the other to see what result would be in both trucks IPC installed from no start truck into running work truck runs fine. Have had the sensor installed in the truck since the swap and no problems. IPC from running truck installed in non running truck and no different, still no start and same voltage readings. Batteries are new, but have not put a load test on them yet. FICM voltage is 49.8 though. Have not yet pulled back the tape from the wiring to see exactly which route the IPC wires run but did follow the bundle as best I could to see if there was any chaffing. Have not found any spots yet.

 

It will be interesting to see the manual gauge readings!

 

Me too, just want it running. Do you know if the HPOP has been a big issue on these trucks 05 or has it just generally been oil leaks? Also do you know if anyone has every tried to splice in a small say AAA battery in the loop to try to fool the PCM into seeing high enough voltage to fire the injectors? Just a thought, not as a fix but just diagnostics

 

The HPOP on the 05 and up trucks is a lot more "bulletproof" than the earlier trucks but the fitting that connects the pump to the rest of the HPO system (STC) fails very often IF it hasn't been upgraded, and even some of the new ones fail (improper install usually). You can air test the HPO system through the IPC sensor port for leaks if you have the air available.

 

OK here is the new deal, bought a high pressure gauge from a hydraulic shop today. Just hooked it up and on initial cranking it had 250 PSI in the HPO system cranked again for about 30 secs and it went up to 395 PSI. Threw the code scanner on it and still only had the P2285 code erased the code and did not come back after cranking as well no other codes are present. AAARGH, HPO system problem I would only assume from here?

 

Sounds like it is a HPO leak. As mchan said - it is odd about the code though. STC fitting and dummy plugs at a minimum IMO. Even if it is something else, it is good to address these weak points.

 

Where will I find the dummy plugs? As for the code, I erased the code from the scanner and cranked it over with no code, unplugged the IPC and received the code again. I may have accidentally unplugged the IPC before while working through this issue before and cranked it over, causing the code. As of right now no codes just wont start. Can I do a visual for the leaks or is it best to just throw air at it?