2005 F-250 DTC P0046 - Diesel Bombers



Ford Powerstroke 03-07 6.0L Discussion of 6.0 Liter Ford Powerstroke Turbo Diesels

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Old 11-08-2012, 09:15 PM
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Default 2005 F-250 DTC P0046

My 2005 Ford F-250 with a 6.0 L , I drive it daily to work and back, I drive an hour each way. It is mostly highway driving. Anyway the other day it started showing a lack of power when starting out and smoking like a freight train, if I stay in the throttle it will clear up and the boost pressure will go up, if I am cruising down the highway the pressure only reads between 1 and 3 psi, I have cleaned the EPB tube and sensor, they were not very dirty at all. I looked in the end of the turbo and it looks clean as well. There is 170K miles on the truck.
Just wondering if there is anything else to do before I try replacing the VGT Solenoid.
Any help would be greatly appreciated.
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Old 11-09-2012, 07:16 AM
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That code is essentially saying you have an open or short to ground feeding the VGT solenoid, I wouldn't replace the solenoid itself, I'd be going over the wiring harness from the PCM to the VGT solenoid with a fine tooth comb.

It is also possible your turbo is just starting to stick, especially if you are just daily driving this without ever really pulling a large load or hot rodding it and that many miles. The turbo's on these trucks like to be exercised to remain functioning properly. Obviously not everyone can do that, so they find themselves pulling the turbo to clean it more often, not a huge deal really. I'd check over the harness first, see if you can find any place it's been rubbing. If you can't seem to find anything, I'd pull the turbo and give it a cleaning.
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Old 11-09-2012, 09:32 AM
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Ok, I will go over the wiring this weekend and see if I can find anything. I do run this truck pretty hard traveling the highway and also pull a 38' travel trailer every couple months. I looked in the end of the Turbo and it doesn't look too bad. Not sure if looking in the end of it would really show anything, This is my first Diesel so Im not real familure with them.
I will let you know what I find. Thanks for the info.
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Old 11-09-2012, 10:17 AM
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Yeah looking in either end wont tell you much, at least not with the issue you're seeing. That's good that it gets worked out often.

Check over the harness and let us know what you find. If you can't find anything, this is the next step to take IMO: DTS Articles - Turbocharger Reconditioning
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Old 11-10-2012, 11:36 AM
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Ok, so I checked all the wiring and can't find anything that looks bad or anything.
If the VGT solenoid is bad, will it give the P0046 Fault?

---AutoMerged DoublePost---

Ok, so here's the latest, I hope I can explain this, the truck starts and idles just like it always has, doesn't idle rough or anything. What it seems to be doing is loading up on fuel and once I throttle it, it smokes a lot then clears up, boost pressure comes up and it still has plenty of power, it will eventually load back up until I put a load on by accelerating.
The boost pressure will drop to 0 while cruising down highway until I start climbing a grade then it will blow smoke again. I do have an Edge programmer installed, it has been on there for over a year now, I have also changed the programs and that had no effect to the issue I am having.

Last edited by jjpower04; 11-10-2012 at 11:36 AM. Reason: Automerged Doublepost
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Old 11-12-2012, 08:13 AM
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It's basically the vanes on the turbo are not working correctly. The turbo is shutting down on you driving down the road (thus the black smoke) then when you get into it and get pressure up it spools up again, but sluggishly. I would be easy on it until you get this resolved, as you're creating a ton of backpressure (hard on headgaskets).

What I want you to do now is clean the EPB sensor. I had this EXACT same issue happen, but I had no codes. I started monitoring the EPB sensor readings and it kept going from full MAX to full MIN continuously. Mine ended up being the wire harness going to the EBP sensor was chaffed up pretty good.

Under the hood, find the drivers side exhaust manifold. Tapped into the manifold you'll see a stainless tube, follow the tube up and you'll find the EBP (exhaust back pressure sensor). Remove the sensor and the tube, clean both thoroughly and reinstall, then try driving the truck again. I'd inspect the harness going to the sensor too.
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Old 11-12-2012, 08:40 AM
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I removed the tube and sensor and checked and cleaned them the other day, there was nothing in the tube, it was pretty clean, I went ahead and sprayed brake cleaner through it and made sure it was clear, the sensor was a little gummed up, I used brake cleaner and a small pick to get it cleaned out. After that there was no difference in the truck. I checked all the wiring this weekend and found nothing bad on it either. I haven't checked the rubber hose yet, I will do that this evening, if nothing there, the next step would be to remove the turbo and clean it, correct?
Also driving in this morning I got more DTC codes that came up P0046, which was the original one that came up, then I also got P0341 and P2262. I'm thinking this is getting over my head and I will have to take the truck in and have it checked.
I really do appriciate all your help so far.
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Old 11-12-2012, 08:50 AM
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Try this:

https://www.dieselbombers.com/ford-p...2262-code.html


More codes are good, it tells us where to look! You can handle this one, I promise you, you're NOT in over your head despite what you may think. The link for cleaning the turbo is in there too. My guess is your MAP hose may need replacement, other than that I'd clean the turbo.
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Old 11-12-2012, 12:26 PM
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Would you happen to have a picture of the MAP hose, I think I know what one it is, but I'm not 100% sure.
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Old 11-12-2012, 01:01 PM
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If you look at the intake manifold, passenger side, the hose comes right off of a barb on the top of the manifold there, can't miss it, it's the only thing going into the intake manifold right there.
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