P0299 turbo underboost - Ford Powerstroke Diesel Forum
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post #1 of 19 Old 01-15-2020, 07:12 PM Thread Starter
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P0299 turbo underboost

Hey all, itís been a long time since Iíve been on the forum, and true to firm I need some help. I have a code with no symptoms that I need to get to the bottom of. A little history first:

I had an open glow plug circuit in cylinder 6 throwing a code, so two days ago I replaced all my glow plugs and my glow plug harnesses. That was a pain, but solved my problem. I have also had an intermittent hard start situation for years. Sometimes it just cranks forever before it starts, and usually I need to try multiple (2-3) cycles of the key with the injectors buzzing to get it to fire up. Happens hot, cold, summer, winter, after sitting for days, or after sitting for a few hours. No rhyme or reason, but itís never stranded me.

This morning after sitting for an entire day I started it up and it fired right up but sounded terrible for a minute bucking and missing as it came to life. I thought I might have an issue, but it smoothed right out and didnít throw any codes.

Iím late with my registration because I have to get the truck smuggled, and I was waiting for all the monitors to reset from clearing the glow plug code. I parked, checked the monitors and it wasnít throwing any codes. When I restarted the truck out of nowhere I got a CEL and P0299 Turbo Underboost. It started right up with no hesitation and ran smoothly out of the gate, but gave me the CEL instantly upon startup.

Now I was all over the place snaking the glow plug harnesses, so I figured I must have screwed something up. I checked all over, and cant find an issue. I cleared the code and drove it for a while, no new CEL. Then I romped on it on the freeway to make sure my turbo vanes were getting a workout and I instantly got the same P0299 CEL.

I fired up my monitor (I use Dashboss) and Key On Engine Off my various air pressures matched. Exhaust Back Pressure, MAP and the Barometric pressure all matched. I fired it up and watched the MAF, EBP, and MAP move up and down upon acceleration/deceleration, so it seems my sensors are working properly. Iím pretty confident I got the air filter and turbo intake all put back together properly.

Sorry for the novel, I just wanted to let you know what I have done already. Any advice is greatly appreciated. Thanks in advance.

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post #2 of 19 Old 01-16-2020, 04:48 AM
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I hear P0299, I think turbo veins that need cleaning. Thereís other things. If you look at VGT% while driving, and it approaches 75% or 15%, points to that. Could also be a leak in the system post turbo. Could be other things to,

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post #3 of 19 Old 01-16-2020, 07:21 AM Thread Starter
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Thanks, Iíll check that out and post back


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post #4 of 19 Old 01-16-2020, 08:11 AM
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Thanks, Iíll check that out and post back
The VGT range is actually not approaching 85% and 15%. Put something different.

With that, points towards removing the turbo, splitting it in half, cleaning the veins, perhaps replacing the unison ring, putting it together again, and should work. Its a job that can be done at the house, but boy do I hate pulling the turbo. I hate even more spending the money to have someone do it.

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post #5 of 19 Old 01-16-2020, 08:48 AM Thread Starter
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Test run

Well, I gave her a run monitoring VGT. First I checked out ICP when it was cold KOEO and it read zero just like it should. Seems like all my sensors are working as they should. When I first started, the ICP was pegged at 85% at idle which really concerned me, but as soon as I started off it normalized and stayed within normal ranges. I did some homework, and apparently 85% at idle is normal sometimes, especially if you have aftermarket exhaust (I have 4 inches turbo back with the CAT in).

Ran it through the paces for about 5 miles, hard accelerations, easy stop to start and I stayed inside normal VGT ranges and didnít throw a new code.

Maybe the sucker was stuck and running it hard cleared it out? I need to put some miles on it to get the monitors ready for smog, fingers crossed. I expect Iíll get the code again and have to start doing some real detective work.
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post #6 of 19 Old 01-16-2020, 08:57 AM
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Originally Posted by fuzzman View Post
Well, I gave her a run monitoring VGT. First I checked out ICP when it was cold KOEO and it read zero just like it should. Seems like all my sensors are working as they should. When I first started, the ICP was pegged at 85% at idle which really concerned me, but as soon as I started off it normalized and stayed within normal ranges. I did some homework, and apparently 85% at idle is normal sometimes, especially if you have aftermarket exhaust (I have 4 inches turbo back with the CAT in).

Ran it through the paces for about 5 miles, hard accelerations, easy stop to start and I stayed inside normal VGT ranges and didnít throw a new code.

Maybe the sucker was stuck and running it hard cleared it out? I need to put some miles on it to get the monitors ready for smog, fingers crossed. I expect Iíll get the code again and have to start doing some real detective work.
The vgt turbos on the 03-60l need to be exercised by some light hot rodding at least once a month. Also I noticed a bit of better performance running a diesel fuel additive like diesel kleen. I didn't even run it often but it made a noticeable difference in reducing the egr valve build up and the unison ring and little fingers were way cleaner after using the fuel treatment. I would advise once or twice a month really "exercise" the turbo and let it cool down for a bit before turning it off, (not saying you weren't letting it cool of in the past though). Also your icp reading will not be affted by an aftermarket exhaust. When I was new to the 6.0ls a couple of shops in sac (who will remain nameless for now....) tried telling me I had to have my cat and muffler to keep the backpressure right for the turbo hahahahahahaha.

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post #7 of 19 Old 01-16-2020, 09:10 AM Thread Starter
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I used to run Diesel Kleen and stopped as I didnít see any benefit. Might start running it again. Justin, you checked inside your turbos enough to notice the difference....wow, thatís a lot of pulling turbos. I pulled mine and cleaned it quite a while back when I did an oil cooler immediately after purchasing. When I had the truck studded and put in the remote oil cooler about 40K miles ago they did it again.

I checked out ICP on the advice of Ron the Diesel Tech (RIP Ron). He said in a video about VGT that it was one of the sensors I should be sure was calibrated by ensuring it was measuring zero KOEO.

Thanks for all the advice fellas


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post #8 of 19 Old 01-16-2020, 09:10 AM
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New turbo fixed my P0299 CEL (and the 15lbs max boost) I have noticed that the original turbo only read 75% at idle and the new one runs at 85%
I wussed out and had it installed in the shop (should've waited since it blew the EGR cooler a week later)

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post #9 of 19 Old 01-16-2020, 01:44 PM
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When my P0299 code showed up, it was always intermittent, but got more and more frequent.

If you have an air-compressor, you can rig a 4" Rubber pipe boot to do a Turbo Leak Check. At 5 - 10 PSI you'll hear the leak.

Also, an easy thing to check is the MAP hose. That can be cracked or broken leading to faulty turbo readings.

Tunes can be written to exercise the turbo veins on start up. Maybe you have that. Maybe the stock tuning does it, I don't know. Perhaps the EBP Sensor tube is clogged.

2005 F250, 189,000 Miles
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Airlift 5k Airbags and Wireless Air
Edge CTS w/ EGT probe and Fuel Pressure Sensor.
15 MPG slick; 10 MPG towing 11k fifth wheel
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post #10 of 19 Old 01-16-2020, 04:02 PM
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I used to run Diesel Kleen and stopped as I didnít see any benefit. Might start running it again. Justin, you checked inside your turbos enough to notice the difference....wow, thatís a lot of pulling turbos. I pulled mine and cleaned it quite a while back when I did an oil cooler immediately after purchasing. When I had the truck studded and put in the remote oil cooler about 40K miles ago they did it again.

I checked out ICP on the advice of Ron the Diesel Tech (RIP Ron). He said in a video about VGT that it was one of the sensors I should be sure was calibrated by ensuring it was measuring zero KOEO.

Thanks for all the advice fellas
I pulled it three times that year and the truck had less than 70k when I started and put almost 20k that year because of some road trips. I was very new to diesels so I tested fuel economy, and all sorts of random stuff. The diesel kleen only really helps keep the egr valve a little clear and the turbo was noticeable cleaner. It didn't help with fuel economy and I didn't experience cold weather at Travis AFB. I now run a 1999 7.3l and for me the diesel kleen is mainly used only a few times a year for road trips but it did give a very slight boost when I used it on winter fuel.

Winter blended diesel is designed to fight freezing but at the cost of reducing fuel economy etc. I tried some fuel additives and diesel kleen was available everywhere and helped winter fuel so I use it every now and then.

-99 F250, 4X4, 6.0 trans cooler, 08 mirrors, 05 grill, AIS Intake, lvl kit, JW Vbody, cncfab hpop lines, WW2.

04 Excursion Modified, 04 F350 Modified, 06 F350 Modified

Interested in learning something new?


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