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Well on that not, im looking for a new tune

p0480 p0481 p0740 p0785

I tried but didn?t nothing worked until i brought it to a gm dealership and had them flash it

Would it be the tune that caused the issue?

so I might know the answer to my own question but figured I would ask anway. I have an 05 Silverado 2500
hd and I copied the tune over that my cousin has in his 2000 2500. basically my truck threw...