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NNBS Engine Power Reduced- P1516


Hey guys I need some help. I've got an 07 NNBS Silverado 5.3

Last week I used my remote start for my truck and it fired up and quit. The remote start wouldnt work so i went and started the truck with the keys. When i did this it started up and idled horribly in with the DIC reading "Engine Power is Reduced" I plugged in my diablo tuner and read the codes. I had a P2176 and P2101. I cleared the codes and the truck started up and ran normally. I drove the truck all day and it had some advancements in the idle. The rpm's would race in neutral and park. Anyway i researched it. Cleaned the carbon out of the throttle body and the truck straightened out. A couple days later not two miles from my house while driving it went into power reduction mode. This time only the P2101 and P1516 codes showed up. I cleared them. fired up and was on my way. This happened one more time that morning. After more research i ended up bringing it to my local gmc dealer for an idle relearn. After this the truck idled much better and has run fine for the past couple of days.

Now its been at least 200 miles since i had the idle relearn done but today i was on my way to work itwent into to Power reduction mode. This time the only code to come up was the P1516. Same thing i cleared it and i was good.

I am not just confused. The other two codes were related to the TAC. The only code now is the p1516- "Intake Manifold Runner Control Input (Bank 1) See P2014."


What do you guys think?!

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