Help: Code P0299??

[Llyduramax22]

OK, this is the story.

Back when the LLY came out, and people started putting on either aftermarket aircleaners, EGR blockers, or exhaust systems, AND they went driving in the mountains, the infamous P0299 Underboost code came up. It is a performance limiting code, so it was important to resolve. It was often accompanied by MAF codes.

What was happening, is that since you altered the air flow going in and out of the engine, the MAF sensor reading + the baro sensor reading, did not line up with the boost sensor reading. So the GM computer "guesses" at what is wrong, and it figured there was a problem with the boost. The boost sensor itself still was reading OK, the turbo was fine, but the MAF reading was different we found.

So it is unlikely that there is really anything wrong with your truck UNLESS you are bone stock.

The easy fix is to increase the boost error limits to 15 psi, IIRC, as Othergirl posted above. Trying to "recurve" expected boost is fine, editing the MAF sensor scaling, etc, will all git-er-dun but the boost error limit is the most reliable way of killing it.

My truck has an after market air intake, straight pipe exhaust and I live in the mountains, and my turbo cuts out and acts like it's starving for fuel or something. Almost sounds like it's hitting a rev limiter. Before I got efi live I was getting the p0299 code. I also have the p0101 code even after a brand new MAF sensor. Would increasing my boost error limits to 15 likely fix my problem??

 

[Llyduramax22]

Turbo cutting out

My turbo on my 05 intermittently cuts out and I have an after market air filter and a straight pipe exhaust, and I live in the mountains. I get the p0299 code and the p0101 code. Could adjusting my boost error limits to 15 psi fix my problem? Thanks

 

[0607lbz]

OK, this is the story.

Back when the LLY came out, and people started putting on either aftermarket aircleaners, EGR blockers, or exhaust systems, AND they went driving in the mountains, the infamous P0299 Underboost code came up. It is a performance limiting code, so it was important to resolve. It was often accompanied by MAF codes.

What was happening, is that since you altered the air flow going in and out of the engine, the MAF sensor reading + the baro sensor reading, did not line up with the boost sensor reading. So the GM computer "guesses" at what is wrong, and it figured there was a problem with the boost. The boost sensor itself still was reading OK, the turbo was fine, but the MAF reading was different we found.

So it is unlikely that there is really anything wrong with your truck UNLESS you are bone stock.

The easy fix is to increase the boost error limits to 15 psi, IIRC, as Othergirl posted above. Trying to "recurve" expected boost is fine, editing the MAF sensor scaling, etc, will all git-er-dun but the boost error limit is the most reliable way of killing it.

What kind of scanner or tool/programmer are you using to correct the maf table or allow for the 15psi error