Qualifying Defects Under Wisconsin Lemon Law
What kinds of vehicle defects qualify for a Wisconsin Lemon Law refund — the substantial-impairment test under Wis. Stat. § 218.0171(1)(f).
A defect qualifies under the Wisconsin Lemon Law when it constitutes a “nonconformity” that substantially impairs the use, value, or safety of the vehicle under Wis. Stat. § 218.0171(1)(f).
Topics in this section
- Transmission defects
- Engine defects
- Brake-system defects
- Electrical and software defects
- Steering and suspension defects
- Infotainment defects
- EV-specific defects
The substantial-impairment test in Wisconsin
Wis. Stat. § 218.0171(1)(f) defines a “nonconformity” as a defect that “substantially impairs the use, value, or safety” of the vehicle. Three-prong test (use OR value OR safety) — matching most peer states.
No separate serious safety defect category
Wisconsin doesn’t have a separate lower repair-attempt threshold for serious safety defects like Virginia, Georgia, or Washington. All defects use the same four-attempt or 30-day OOS thresholds under § 218.0171(1)(h).
What’s substantial vs. trivial
- Transmission that shifts hard — qualifies.
- Engine that stalls — qualifies.
- Brake-pedal feel that varies — qualifies.
- HVAC defroster system failure — qualifies (critical in Wisconsin winter).
- Power-window switch — typically doesn’t qualify alone.
What’s NOT a qualifying defect
- Damage from accidents.
- Damage from unauthorized modifications.
- Normal wear.
- Neglect or misuse.
- Cosmetic flaws.
- Defects caused by the consumer.
How qualifying defects interact with repair-attempt counts
A qualifying defect alone isn’t enough — the consumer must meet § 218.0171(1)(h) thresholds: four attempts for the same nonconformity, OR 30 cumulative calendar days OOS, within the 1-year Rights Period.
Great Lakes / cold-weather factors
Wisconsin’s cold climate and aggressive winter road salt stress vehicles:
- Underbody corrosion — winter road salt aggressive on brake lines, fuel lines, exhaust systems.
- HVAC defroster — critical 6 months per year.
- Cold-start systems — sub-zero Wisconsin winters stress starters, batteries, fuel systems.
- Tire wear — winter / summer tire cycling.
- EV cold-weather range degradation — Wisconsin winters significantly reduce EV range.
Document weather conditions when symptoms manifest.
What court / BBB Auto Line considers
- Clean documentation.
- Consistent symptoms across visits.
- Defect persistence after the final repair opportunity.
- Aligned with documented TSBs or recalls.
- For double-damages exposure: manufacturer’s response to written election within 30 days.
Related
Wisconsin Lemon Law — Frequently Asked Questions
Quick answers to the most-asked questions about Wisconsin's Lemon Law and the automatic double damages mechanism.
Read → TopicWisconsin Lemon Law Cases by Manufacturer
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Read → TopicThe Wisconsin Lemon Law Process
Step-by-step: how a Wisconsin lemon-law case moves through repair attempts, written election, the famously strict 30-day refund/replacement clock, manufacturer arbitration, court action, and double damages.
Read → TopicWisconsin Lemon Law Remedies
What you can recover under Wisconsin's lemon-law framework — refund, replacement, cash-and-keep, AUTOMATIC DOUBLE DAMAGES on 30-day non-compliance, and mandatory § 218.0171(7) attorney-fee recovery.
Read → TopicThe Law: Wisconsin Lemon Law and Double Damages
The statutes behind a Wisconsin lemon-law claim — § 218.0171 Lemon Law (with automatic double damages), Magnuson-Moss, and timing rules.
Read → TopicVehicle Types Covered by Wisconsin Lemon Law
How Wisconsin's Lemon Law applies to used cars, leases, EVs, motorcycles (including Harley-Davidson!), RVs, and commercial vehicles.
Read →Think you've got a lemon?
Compare your situation to your state's requirements — and connect with a vetted lemon-law attorney for a free case review.