Indiana law calls this the Motor Vehicle Protection Act, but everyone knows it as the lemon law. It exists because some defects never truly go away no matter how many times a service department promises they fixed it. If you keep returning for the same problem, the law shifts the cost back onto the carmaker instead of leaving you stuck with a payment on a broken vehicle.
Below we break down the qualifying thresholds, the repair-attempt rules, what a refund actually includes, and the common mistakes that sink otherwise valid claims.
📊 The numbers that define an Indiana lemon
Three figures decide almost every Indiana lemon law case. Memorize them, because they are the thresholds the manufacturer will check first.
| Rule | Threshold | Why it matters |
|---|---|---|
| Protection term | 18 months OR 18,000 miles, whichever first | The defect must first show up inside this window. Report it early. |
| Repair attempts | 4 or more for the same defect | Triggers the legal presumption that repairs were unreasonable. |
| Days out of service | 30 or more business days total | Alternate trigger even if you had fewer than four visits. |
| Filing deadline | 2 years from first report, or 18 months from delivery, whichever later | Wait too long and the claim is time-barred. |
| Weight limit | 10,000 lbs gross vehicle weight or less | Heavier trucks fall outside the act. |
Note that the 30 days do not need to be consecutive. A car that sat at the dealer for a week here and ten days there still adds up. Keep every repair order so you can prove the running total.
✅ When and why a car qualifies
A vehicle is a lemon under the Indiana lemon law only if the defect substantially impairs its use, market value, or safety. A rattle in the dash or a stained floor mat will not qualify. A transmission that shudders, brakes that fade, or a check engine light that keeps returning are the kinds of nonconformities the act was written for.
To qualify, all of the following must be true:
- The vehicle is new and was bought or leased in Indiana.
- It is used primarily for personal, family, or household purposes.
- The defect first appeared within 18 months or 18,000 miles.
- The defect is covered by the manufacturer warranty.
- You gave the dealer a reasonable number of repair attempts.
If you are still trying to figure out whether your symptom is serious enough, our AI can rank the likely causes before you ever talk to a service writer. Recurring codes like a P0420 catalytic converter fault or a P0300 misfire often signal exactly the kind of persistent defect that builds a lemon case.
🔁 How the repair-attempt rule really works
The four-attempt and 30-day numbers create what lawyers call a presumption. Hit them and Indiana presumes the manufacturer had a reasonable chance and failed. That presumption is powerful, but it has fine print.
The same defect must repeat
Four unrelated repairs do not count. The law looks at four attempts on the same nonconformity. If you bring the car in once for a misfire, once for the AC, and once for a window, that is three different problems, not a lemon trigger.
Written notice to the manufacturer
Before you can demand a buyback, Indiana generally requires you to notify the manufacturer in writing and give it a final chance to repair. Send it certified mail and keep the receipt. Skipping this step is the single most common reason valid claims stall.
Document every visit
Each repair order should list your complaint, the date, the mileage, and what the dealer did. Vague invoices that say "could not duplicate" still count as attempts, so insist the visit is written up even when nothing is found. A clear repair history also helps when you use our quote checker to confirm you were not overcharged for failed fixes along the way.
⚠️ Common mistakes that kill a claim
- Waiting past the window. The defect must first appear within 18 months or 18,000 miles. Buyers who ignore an early symptom and report it at 20,000 miles lose protection.
- Going to an independent shop. Lemon law attempts must usually be performed by an authorized dealer. A trusted local mechanic does not create qualifying attempts, even if the work is excellent.
- Throwing away repair orders. No paperwork means no proof. Photograph every invoice the day you get it.
- Skipping the written notice. Calling the service manager is not the same as formal written notice to the manufacturer.
- Accepting a fast cash offer. Manufacturers sometimes offer a small goodwill payment to make the problem disappear. A full buyback is often worth far more.
If your symptom is intermittent, like an occasional shake when braking, push to have it documented every single time so the pattern is undeniable.
💰 Refund vs replacement: what the manufacturer owes
Once a car qualifies, the manufacturer chooses between two remedies, but both must make you close to whole.
| Remedy | What you receive | What is deducted |
|---|---|---|
| Refund | Purchase price, sales tax, registration, finance charges, and incidental costs like towing | A reasonable allowance for miles driven before the first repair attempt |
| Replacement | A comparable new vehicle acceptable to you | The same mileage-use allowance applies |
The mileage offset is calculated from the miles you drove before the first repair, not your total mileage today. That detail matters, because a defect that surfaced at 1,500 miles leaves only a tiny deduction even if you are now at 16,000. Insist the allowance is calculated from the correct point.
🧭 Your step-by-step path to a buyback
- Report the defect immediately to an authorized dealer and confirm it is in writing.
- Keep returning for the same problem until you reach four attempts or 30 days out of service.
- Collect every repair order and build a timeline with dates and mileage.
- Send written notice to the manufacturer by certified mail, requesting a final repair opportunity.
- Demand a refund or replacement if the final attempt fails.
- Use arbitration or a lemon law attorney if the manufacturer refuses. Indiana lets prevailing consumers recover attorney fees, so many lawyers take these cases at no upfront cost.
Before all of that, it helps to walk in knowing what is actually wrong. Our guide to reading OBD2 codes shows you how to capture the same evidence the dealer sees, so the conversation starts on your terms.
❓ Indiana lemon law FAQ
📌 TL;DR
The Indiana lemon law covers new vehicles for the first 18 months or 18,000 miles. You build a case with four repair attempts on the same defect or 30 business days out of service, then send written notice and demand a refund or replacement. Document everything, stick to authorized dealers, and act before the window closes. This page is general information, not legal advice, so confirm the current statute or consult an Indiana attorney for your specific situation.