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Old 03-10-2013, 08:37 AM
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What causes the P0299 code

So since I've installed my hybrid turbo and my S&B intake at the same, I'll check my codes once and a while and I get the P0299 code- Turbocharger under boost. I've read maybe unison ring, but I'm sure Adrian would have had that in good shape already, I've also read aftermarket intakes and boost leaks can cause this, but it builds boost fine. Anyone have any helpful insight?

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Old 03-10-2013, 08:56 AM
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I get the same code too. Only when pulling a trailer though. Plowing i don't get the code.
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Old 03-10-2013, 01:50 PM
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Yes unison ring and/or sticking vanes can cause this along with intake leaks and egr related things. Never really heard of a CAI causing an under boost. Other famous cause's are the EBP sensor and a sticky VGT solenoid
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Old 03-10-2013, 02:15 PM
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Re: What causes the P0299 code

EBP sensor should be clear, checked it a few thousand miles ago and it was clean then. Only happens occasionally, I'll leo a closer eye on it

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Old 03-10-2013, 03:09 PM
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On a stock turbo 90% of the times this is caused by a sticking or stuck turbo. If your peak boost is low all the time it can be an intake or exhaust leak
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