code P0299 low turbo boost check engine light HELP - Diesel Forum -
6.0L Power Stroke Engine and Drivetrain Discussion of the 6.0L Power Stroke diesel engine and drivetrain in the 2003-Up Super Duties and Excursions. No gas engine discussion allowed except on transmissions and drivetrain that pertain to all models. Please confine discussion of topics in this forum to those items that are specific to the 6.0L Power Stroke engine.

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post #1 of 4 (permalink) Old 12-30-2010, 10:58 PM Thread Starter
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code P0299 low turbo boost check engine light HELP

I have a 2005 Ford Excursion 6.0 4x4 that's been to the shop twice in the last 2 weeks with the check engine light on. The code is P0299. The turbo was removed and cleaned in July for the same problem. I just recently installed a 4" turbo back exhaust no cat, not muffler. This is when the problem reoccured. They have put a new EGR valve in it and found that the exhaust backpressure sensor wiring was rubbed through so that was repaired. I just got it back today and the light is on for the 3rd time. I'm wondering if anyone has any suggestions or experience with this. I asked the tech if the exhaust could cause this problem and he said he's pretty certain it wouldn't. I know I'm not the only one driving a 6.0 with no cat or muffler so please help if you can!

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post #2 of 4 (permalink) Old 12-31-2010, 12:32 PM
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I had to have my turbo replaced to get rid of that code. Sometimes cleaning just won't take care of it.


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post #3 of 4 (permalink) Old 01-01-2011, 02:34 PM
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I have stock exhaust with muffler delete. i had the code once about a month after I bought the truck, cleared the code and it hasn't reappeared since. From what I have read it is a pretty common code...just means that at some point the boost was not within the set parameters the computer is looking for. It could happen for just a fraction of time to throw code.

Can Be caused by a bad or sticking turbo but not always. Kind of a phantom code for these trucks.

Not 100% sure but I beleive this code is thrown for both underboost and overboost conditions?......correct me if I am wrong. I don't think there is an actual code for overboost, it uses the same code number if that occurs.

I got the code while towing my work trailer with the cruise set, going up a hill, it was lightly raining and the truck downshifted, spun tires when it down shifted and reved real quick- i saw the factory boost gauge actually spike into the red zone for a moment! Then CEL came on- I thought I toasted something but it ran just fine so I cleared the code and it hasn't come back since.

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post #4 of 4 (permalink) Old 01-01-2011, 08:55 PM
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I had this code a little over a year ago, just a few days after buying my truck. The local dealer replaced the unison ring in the turbo and no issues since. They told me when I brought the truck in that there are two common issues for this code: 1) dirty turbo or 2) replace unison ring.

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