ChadS
Last tank of gas: March 2009
No modification ever "voids the warranty" in the sense that you no longer have a warranty. It can't; the law says if a manufacturer offers a warranty, they can't decide to not honor it for arbitrary reasons.
However, if a modification causes any problem, the automaker doesn't have to fix the problem (the burden of proof is on the automaker to show that the modification caused the problem; this is part of why they word things in a scary fashion to discourage people from installing 3rd-party items on their cars; they don't want to fix problems that might have been caused by modifications where they can't prove it). That makes sense. That's the only time your warranty wouldn't be valid.
Of course an automaker can always give you the runaround and it can be hard to enforce this law. But the first hitch I had put on a Tesla was designed, built and installed by a Tesla service manager.
However, if a modification causes any problem, the automaker doesn't have to fix the problem (the burden of proof is on the automaker to show that the modification caused the problem; this is part of why they word things in a scary fashion to discourage people from installing 3rd-party items on their cars; they don't want to fix problems that might have been caused by modifications where they can't prove it). That makes sense. That's the only time your warranty wouldn't be valid.
Of course an automaker can always give you the runaround and it can be hard to enforce this law. But the first hitch I had put on a Tesla was designed, built and installed by a Tesla service manager.