Quote:
Originally Posted by Jsreo
The tune most certainly will void warranty if the dealer wants it to
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A tune will void the powertrain warranty from GM. There is a flash counter on these ECU's. Whenever it is flashed it creates a new code, which is then registered with GM. If GM requests (and this is important) an ECU read out, and the codes don't match, GM will deny warranty reimbursement to the dealer.
As far as the dealer goes, on a modified car, the only thing really up to them is if they want to work on it. As far as the warranty goes, if it's something that doesn't really need GM's direct approval, often something very minor, or a TSB or recall, as long as GM doesn't request an ECU readout, they'll probably handle it. Again, on a modified car, that is up to dealer policy.
The main reason a dealer may refuse to work on a modified car, isn't so much about warranty as it is liability. Since it is modified, they do not know what exactly, who exactly, and how exactly all of that was done. Once they take it in, and if something happens to the engine while in the shop, for whatever reason, it opens a pandora's box of blame and legal liability. Many dealerships may tell you to take it back to the shop that did the modifications since technically, it's more their engine than GM's at that point.