The Magnuson Moss Warranty Act is often cited as one of the main reasons why dealers must cover a particular part. This can be a failure in a modded or modified car. The question that most car enthusiasts often seem to ask is what happens to the warranty of the product which they bought and then modified that product. Fortunately, the law can help consumers like these. But it is due to lack of awareness and the confusion in this area that invoke the Magnuson Moss Warranty Act.
What is the Magnuson Moss Act?
According to the Act, an automobile manufacturer cannot void your vehicle warranty due to the installation of aftermarket parts. Unless the aftermarket part that caused the vehicle failure or contributed to it (15 U.S.C. 2302 (C)).
This has to be the most mis-quoted and misunderstood legislation in the entire industry.
Quoting this legislation when discussing modifications shows that you not only don’t understand the legislation, but you also never bothered to read your warranty contract.
MM does not apply to vehicle modifications. The term “aftermarket” in MM refers to replacement equivalent parts manufactured by someone other than the OEM. So replacement oil filters, air filters, wiper blades, etc. An example would be a consumer coming in with an engine noise concern; the dealer/manufacturer cannot deem it non-warrantable just because the oil filter is a Purolator and not an OEM. However, if they disassemble the filter and find that the media came apart and damaged the engine, then the failure would be non-warrantable.
Aftermarket modifications are a completely different category. You’re not using an equivalent part; you’re changing the configuration of the vehicle with unknown variables. When there is a failure of a factory component or system related/attributed to the modification, it’s non-warrantable.
It’s also not the manufacturer’s responsibility to prove that your aftermarket modification caused the failure, only that the wear or failure is attributable to the modification.
In the case of adding 37’s and a lift, you’re altering everything from CV operating angles to ABS/Stability Control operation to ball joint range of motion and beyond. The manufacturer didn’t engineer or test it in that configuration and they certainly didn’t build it that way. But you think they’re somehow responsible to cover failures attributed to those alterations? And that you should have no personal accountability for issues attributed to your modifications?
For reference, here is the excerpt from the warranty:
I haven’t seen any cases where a court has required the consumer to prove that their work has not led to the problem, and “modification” is specifically used in multiple statements. Are we now saying that anything other than an oil filter or light bulb is a “modification” and now not covered by...
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