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A "tune" does not void all of your factory warranty. If it is deemed that the tune or modifications you made to your car caused the issue and or problem, and that it is not due to the MFG's materials and / or workmanship, then they can deny your claim.
Many such claims are very subjective and subject to GM audits and charge backs. Many dealers are overly cautious and finding one who is friendly to modified vehicles is priceless.
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