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Error Code P259F After Hybrid Turbo Install

318 Views 4 Replies 2 Participants Last post by  CommandX3
Hey guys, so I recently upgraded to an Elantra N hybrid turbo, and I'm in the process of working with N75 for tuning. I have an issue where the car will intermittently have a CEL and the code is P259F which is "Turbocharger "A" Boost Control Position At High Limit." Once the car throws this code, it enters a sort of limp mode where it will only make 2-10 lbs of boost max. The error code can be reset, which restores the full functionality of the car for anywhere from 15-45 minutes of driving before the code pops up again.

What has me perplexed is that the code does not appear during any sort of hard driving, instead pops up when the car is idling at a stop, cruising in 6th gear, and when parking the vehicle, all circumstances where the car is not making boost. I've checked the wastegate voltage and it is at 3.8, which should be correct. My current theory is that there is some sort of failure occurring with the boost sensor itself that is causing it to throw a false code, but I am interested to hear what ideas you guys have.

Thanks in advance for the ideas!
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Most likely the Electronic Waste Gate static setting is incorrect.

Reset to the shop manual settings via manual voltage adjustment.馃憤馃嚭馃嚫

Most likely the Electronic Waste Gate static setting is incorrect. Reset to the shop manual settings via manual voltage adjustment.馃憤馃嚭馃嚫
I have checked the Electronic Waste Gate voltage through an EK-1 and it's reading 3.8, which is within spec exactly. The strangest part of this issue is that the vehicle seems to function flawlessly until the error code appears, but I can't seem to figure out why the code is being thrown.
Check the wiring harness for frays and plugs pins are intact.馃憤馃嚭馃嚫
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I was looking in the engine bay, and noticed that the intake box was contacting the boost sensor harness, I moved it out of the way and tightened it down the intake box so that it won't move up against it, and just got in a good hour long drive without any codes. It's raining right now and I don't have a place to get in there, but I'm going to pull out the intake eventually and just make sure that the harness is not damaged.
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