What a warranty doesn't cover
A vehicle service contract is not a promise to keep your car running. It is a defined list of failures somebody has agreed to pay for, and the shape of that list is determined almost entirely by what it leaves out. Here are the seven groups it leaves out, and the reasoning behind each one.
First, a boundary. We are describing how this category of product is structured — the exclusion groups these contracts are assembled from, and why each group is there. We are not telling you what your contract covers. Coverage differs between administrators, between tiers from the same administrator, and between the same tier sold in different years. The document you signed is the only authority on your car, and the exclusions section of it is usually three pages long and entirely readable.
Stated-component contracts
List the parts that are covered. If a part is not named in the list, it is not covered — there is nothing to argue about. Shorter document, narrower coverage.
Exclusionary contracts
Cover everything except what is named. The exclusions section is therefore the whole product, which is why it is long. Usually the broader and more expensive of the two.
Establish which of those two you are being offered before anything else. It changes what the rest of the paperwork even means. Now, the groups.
GROUP A Things designed to be used up
Parts that have a service life by design and are replaced on schedule rather than when they break.
These contracts price a risk — the chance that something fails unexpectedly. A brake pad wearing out is not a risk, it is a certainty with a known schedule.
Covering certainties is possible, but the only way to price it is to charge you the full cost of the parts plus handling, which makes the product strictly worse than paying for the parts yourself. So the category doesn't do it.
GROUP B Maintenance, and the records of it
The work the manufacturer's schedule tells you to perform, and the proof that you performed it.
Maintenance is not merely uncovered — in most of these contracts it is an obligation you take on, and the covered repairs are conditional on you having met it.
The mechanism is straightforward: the administrator is accepting the risk of a part failing under normal care, so normal care becomes your side of the bargain. This is the practical reason to keep every receipt in one folder from day one. A denied claim over missing records is the most avoidable denial there is.
GROUP C Damage that followed an uncovered failure
The engine that was destroyed by a hose. The transmission that was destroyed by a cooler line. Coverage generally stops at the origin of the chain.
This is the group that produces the most disputes and the most bitterness, so it is worth understanding rather than resenting. If a $40 hose is excluded as a wear item and its failure cooks the cylinder head, many contracts treat the whole event as originating with the uncovered part.
The practical defense is behavioral, not contractual. If a gauge climbs or a warning light comes on, stop driving. Every version of this exclusion turns on whether the car kept being operated after it told you not to, and that is the one variable you control completely.
GROUP D Anything wrong before the contract began
Faults that existed at the moment of sale, and faults that appear inside a waiting period at the start of the term.
The product is insurance against future failure. Without this exclusion anyone could buy a contract on Tuesday for a noise that started on Monday, and the price of the product would have to assume everybody does.
The waiting period — a stretch of days and miles at the beginning during which claims are not paid — exists for exactly that reason. It is also the single strongest argument for having your own mechanic look at a car before you buy it, rather than relying on a contract to absorb what an inspection would have found.
GROUP E The world acting on the car
Damage with an external cause rather than a mechanical one.
All of this is the territory of your auto insurance policy, and the two products are deliberately drawn not to overlap. A mechanical contract that also paid for hail damage would be an insurance policy, regulated differently and priced differently.
It matters in New Jersey for one specific reason: road salt. Winter corrosion is environmental damage, not mechanical failure, so a brake line or a subframe that rusted through generally sits in this group rather than in your coverage.
GROUP F Using the car differently than it was priced for
Changes to the vehicle, and uses outside the ordinary personal one.
Every part in a car was engineered for a set of loads. Bigger tires change what the wheel bearings, the steering and the transmission see; a tune changes what the internals see; towing beyond the rating changes what the cooling system sees.
The contract was priced on the assumption of a stock car in personal use. If either half of that assumption is false, say so before you buy the contract — some administrators will write it, some will not, and finding out at claim time is the worst of the three outcomes.
GROUP G The procedure itself
Not a category of part — a category of mistake. These are covered repairs that get denied on process.
Administrators pay claims against an inspection and an agreed labor time. If the engine is already apart when they are first told, there is nothing left to inspect — which is why the call must happen before the wrench does, and why every one of these contracts has a phone number printed on the front page.
Diagnostic and teardown time is the cost that surprises people most. If the claim is approved, some contracts fold it in; if the fault turns out to be an excluded part, the hours spent finding that out are usually yours.
Ten minutes, five questions
You do not have to read the whole contract, and the salesperson describing it to you is working from a brochure rather than the document. Ask for the actual contract and find five things: is it stated-component or exclusionary; what is the deductible and is it charged per visit or per repair; who administers it and who do I call first; can I use my own shop; and is it cancelable and transferable. That last one has real money in it if you sell the car partway through the term.
None of this is an argument against buying one. A service contract can be a rational purchase, particularly on a car with expensive systems and a thin emergency fund. It is an argument against buying one as a feeling — the feeling being that the car is now somebody else's problem, which is the one thing no version of this product has ever done.
What we do about it. We tell you which of the two kinds you are being offered, we hand you the contract rather than a brochure, and we do not characterize what it covers — because the document does that and we would only be paraphrasing it. If anyone selling you a car answers a coverage question from memory, ask to see the page.
Nothing on this page states the terms, length or coverage of any particular warranty or service contract, including any manufacturer's warranty or certified pre-owned program. Those terms come from the issuing document. This is a description of how the category of product is built.
Related reading
- Certified pre-owned, examined What the certification actually consists of, and who is standing behind it.
- Records that hold value What to keep and how — including the folder that keeps a claim from being denied.
- As-is in New Jersey What that phrase on your paperwork does and does not mean once the car is yours.