Illinois lemon law: how to file (2026)
The complete, plain-English walkthrough — built from the Illinois Attorney General's auto-sales publications and the New Vehicle Buyer Protection Act (815 ILCS 380/), not law-firm marketing. Last reviewed September 30, 2026.
⚡ Start here — two free tools
Eligibility quiz (3 minutes): compare your facts to the two tests below.
Deadline calculator: your estimated days-left count.
What vehicles are covered
Illinois' New Vehicle Buyer Protection Act (815 ILCS 380/) covers new vehicles bought — or leased for at least one year — primarily for personal, family, or household purposes: passenger cars, trucks and vans under 8,000 pounds, and recreational vehicles (except camping and travel trailers).
Not covered (per the Illinois AG): used cars, altered or modified vehicles, motorcycles, and boats.
The two tests (no safety shortcut)
A "reasonable number of attempts" is presumed if, within the statutory warranty period — 1 year or 12,000 miles from delivery, whichever first — any one of these happened, and the manufacturer received prior direct written notification with an opportunity to correct (§3(h)):
1. Four-times test
The same nonconformity persists after 4 or more repair attempts. Different defects don't combine — it must be the same nonconformity.
2. 30-business-day test
The vehicle was out of service by reason of repair a cumulative 30+ business days and the nonconformity still exists. Days need not be consecutive.
No safety shortcut: Illinois has no reduced-attempt test for safety defects — the same 4-times / 30-business-day thresholds apply.
§3(h): the direct-notice requirement
This is the step people miss. The presumption requires prior direct written notification to the manufacturer — not just telling the dealer — plus an opportunity to correct the nonconformity.
The statute does not require certified mail — but a trackable mailing (certified mail, return receipt requested) is the practical way to prove you sent it. Send it to the manufacturer's address in your warranty booklet; sending it only to the dealer is a risk. The LemonLawPath $29 packet includes a draft §3(h) notice letter.
The 18-month suit deadline
Suit must be commenced within 18 months of original delivery (815 ILCS 380/6). The limitations period is extended by the days the matter was pending in the informal dispute procedure — so filing with the manufacturer's program early also protects your clock.
This is the single most important date in your case. Calculate your estimated deadline →
How to file: program, then circuit court
- Step 1 — the manufacturer's informal dispute procedure: find it in your owner's manual or warranty booklet. If a qualifying program exists and you were told about it in writing, you must use it before the Act's remedies apply. The AG warns that claims can't be started through the dealer, and that many consumers lost their remedy by waiting longer than 12 months from purchase. The program is free to you.
- Step 2 — circuit court: if the program doesn't resolve it, claims are brought in circuit court. There is no lemon-law filing fee.
Important caveat: the Illinois lemon law has no attorney's-fee provision — unlike some states, it does not shift your legal fees to the manufacturer. Whether any other law could apply to your facts is a question for an attorney.
What happens after you file
- Program decision — the manufacturer's informal dispute procedure decides. If you're dissatisfied, you can still bring a civil action (the program's decision can be used as evidence).
- Circuit court — if unresolved, a civil action in circuit court with normal court procedure.
Remedies: repurchase, replacement
- Repurchase: the full purchase price or lease cost, including collateral charges (but not taxes paid on the purchase), less a reasonable allowance for your use (the Act limits what use can be counted).
- Replacement: a new vehicle of like model line, if available — otherwise a comparable motor vehicle.
When to talk to a lawyer instead
LemonLawPath is for straightforward, DIY-able cases. Talk to a licensed lemon law attorney if any of these apply:
- Your defect is a serious safety hazard;
- The manufacturer denied your claim or disputes the defect;
- Your 18-month deadline has passed or is under 30 days away;
- Anything about your case feels ambiguous.
Because Illinois' lemon law has no fee-shifting, ask any attorney how they charge before you hire them.
Ready? Build your packet.
Personalized claim narrative, repair-history organizer, evidence checklist, §3(h) notice letter, and filing instructions — $29 one-time. There's no lemon-law filing fee in Illinois.
Sources: Justia — 815 ILCS 380/ (statute reprint) · IL AG — Auto Sales and Repairs