Symptoms
- Car is under warranty or an extended service contract
- Doing some maintenance yourself and unsure if it counts
- Considering skipping a service to save money
Likely causes
- CommonNo formal record kept of DIY maintenanceWarranty companies may deny a claim if you can't show maintenance was done, even if it actually was.
- CommonUsing a non-dealer shop mistakenly thought to void warrantyFederal law (Magnuson-Moss Warranty Act) generally allows independent shops as long as correct parts and procedures are used and documented.
- PossibleSkipped maintenance intervalAn actually skipped service can be a legitimate reason for a warranty claim denial related to that system.
What to do
- Keep every receipt for maintenance, whether from a dealer, independent shop, or parts store, in one folder or a phone app.
- For DIY maintenance, save parts and fluid receipts, and log the date, mileage, and what was done yourself.
- Know that using an independent shop instead of the dealer generally doesn't void a manufacturer warranty as long as correct specifications are followed.
- Read your specific extended warranty contract for any unusual requirements, since third-party contracts can be stricter than manufacturer warranties.
- Never skip a required maintenance item to save money if it's covered under warranty terms, since a related failure could be denied coverage.
- If you ever sell the car, these records also help demonstrate it was well maintained.
When to call a pro
If a warranty claim is denied over a maintenance question, a consumer protection attorney or your state's attorney general consumer division can advise on your rights.
Safety
Generally low risk
Generally low risk for a careful person. Stop if anything looks different from what this guide describes.