Thread: HELP! P2105 and U0300 codes after custom tune
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Old Mon, March 12th, 2012, 06:37 PM
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Jackpine Jackpine is offline
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If you're still having the problem at stock, then it's not the tune. I notice you have a CAI on your truck. What year is the truck? I'm guessing it's not a new model. CAIs on the 04-05 trucks especially can cause the engine to run lean.

Are the throttle body and MAF sensor clean?

And, even if the transmission was replaced 6 months ago, it could well be going bad again.

- Jack
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