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"According to the Magnuson-Moss Act, a vehicle manufacturer cannot automatically cancel your warranty just because you’ve installed aftermarket car parts. This is an illegal practice. That said, if your aftermarket part somehow causes or contributes to a failure in your vehicle, the dealer may be able to deny your warranty claim—as long as they can prove the connection. In these cases, the burden of proof is entirely on the dealership."

If your cheap replica part causes issues to the thing you're trying to warranty then yes. If you replace the headlights with crappy clones from ebay, and Chevy says your warranty is void on your transmission, no.

[nazgulsenpai]

That makes sense. Thanks for clarifying.

[infogulch]

Totally valid question that prompted a great answer. Thank you!

For some context, the Magnuson-Moss Warranty Act [1] mentioned above was made a law in 1975. This action by the FTC is basically calling HD and WH out on their noncompliance with this law, and more generally announcing their intention to enforce it more boadly. It's unfortunate that the FTC has allowed this lawbreaking behavior run rampant for decades, but I'm glad that they've gotten off their laurels and are finally moving on it now.

https://en.wikipedia.org/wiki/Magnuson%E2%80%93Moss_Warranty...