Like most everything else in life, there is no yes or no answer. The warranty states that it does not cover damage due to modifications. If (for example) you retune your engine to significantly increase the air/fuel ratio and your engine blows due to cooked pistons, AND GM finds out about it by reading the tables in your ECU, the new engine will be your treat to yourself. Certain dealers who for some reason don't feel like doing warranty work on Vettes will seize on any evidence of modifications (no matter how unrelated to the claim in question) to deny warranty coverage - and sometimes will be upheld by GM and sometimes not. Then you get to arbitrate/sue etc. This has always been the case.Previously there was a tread that GM would void the warranty on the engine if the ucu on 2007 models on,have been retuned.
IS THIS TRUE?:huh: