Will Aftermarket or OEM Parts Void My Warranty? What You Need to Know

If you're considering an upgrade from 404 Parts — whether it’s a Genuine GM emblem, custom harness, or lighting upgrade — it’s natural to ask:

“Will this void my vehicle's warranty?”

Here’s what federal law says, and how it generally applies to parts we offer.

What Is the Magnuson-Moss Warranty Act?

The Magnuson-Moss Warranty Act, passed by Congress in 1975, is a federal law that protects consumers from unfair warranty practices. This law prevents manufacturers and dealers from automatically voiding your warranty simply because you’ve used aftermarket or non-OEM parts.

⚖️ Key Point:

Under the law, a dealership or manufacturer must prove that an aftermarket part directly caused a failure in order to deny a specific warranty claim.

How This May Apply to 404 Parts Customers

Many of the parts we sell are either Genuine GM or designed to integrate with factory specifications using OEM-style connectors and mounting points. In most cases, these do not require any permanent modifications to the vehicle.

However, every vehicle, dealership, and situation is different. We cannot speak on behalf of any dealership or manufacturer. Warranty coverage decisions are ultimately made by the servicing dealer or OEM, and may depend on things like installation quality, vehicle condition, and the nature of the claim.

That said — a big part of this comes down to how you handle the conversation. Know your rights and understand the law, because in many cases, the dealership may not. Don’t assume they’re correct just because they say something with confidence. Always feel free to ask for documentation or clarification if they say a part has affected your warranty. You’d be surprised how often that ends the conversation.

✅ What Dealers Can and Can’t Do

Dealers CAN:

  • Deny coverage for a repair if they can demonstrate the aftermarket part caused or contributed to the problem.

  • Require inspection or documentation before approving a claim.

Dealers CANNOT:

  • Void your entire warranty just because a non-OEM part is installed.

  • Require you to use OEM parts to keep your warranty (unless provided free under recall/service bulletin).

If a dealer claims a part voids your warranty, you can request written documentation showing how the part caused the specific issue.

Best Practices for Peace of Mind

To help avoid any warranty issues:

  • Keep receipts and installation instructions.

  • Use VIN verification (we offer this before purchase).

  • Have parts professionally installed when possible.

  • Ask your dealership upfront how they approach accessories and upgrades — some are more flexible than others.

Bottom Line: Know Your Rights, But Use Good Judgment

The Magnuson-Moss Warranty Act offers real protections, but it doesn't guarantee that every dealership experience will be smooth. We're here to help you make informed decisions and ensure you're getting the right part for your vehicle the first time.

📌 Disclaimer:
This article is for general informational purposes only and does not constitute legal advice. Warranty coverage is determined solely by the manufacturer or authorized service provider. When in doubt, consult your dealer or a qualified professional.

✅ Need help choosing the right part?

Send us your VIN and we’ll confirm fitment before you buy.

404 Parts
Genuine GM Parts | Custom Harnessing | Real Fitment. No Guesswork.

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