Montana lemon law: the New Motor Vehicle Warranties Act MCA §§ 61-4-501 to 61-4-533, the 2-year / 18,000-mile warranty period, the 4-attempt threshold, and the 15,000 lb GVW exclusion

Montana's lemon law, the New Motor Vehicle Warranties Act codified at MCA §§ 61-4-501 through 61-4-533, provides a moderate framework with one distinctive feature: the warranty period uses an 18,000-mile cap rather than the more common 12,000 or 24,000-mile thresholds. The framework otherwise follows the conventional pattern: a 4-attempt threshold, a 30 business day out-of-service threshold, a substantial impairment standard, and a refund-or-replacement remedy.

The Montana Department of Justice Office of Consumer Protection oversees enforcement and provides resources for consumers. The framework works alongside the federal Magnuson-Moss Warranty Act and the Montana Uniform Commercial Code.

What vehicles does Montana's lemon law cover?

Montana's lemon law covers new passenger vehicles, motorcycles, and the nonresidential portion of motor homes purchased, titled, or leased in Montana. Trucks with a gross vehicle weight of 15,000 pounds or more, used vehicles, vehicles purchased for resale, and the residential portion of motor homes are excluded from coverage.

Under MCA §61-4-501, the statute defines "motor vehicle" as a self-propelled vehicle designed primarily to transport persons or property on public highways, sold or registered in Montana. The coverage includes:

New passenger motor vehicles purchased, titled, or leased in Montana.

Motorcycles.

The nonresidential portion of motor homes. (Montana covers the chassis and drivetrain of motor homes; the residential portion, meaning the living quarters, appliances, furnishings, and features designed for residential purposes, is excluded.)

The "consumer" definition includes the purchaser or lessee of a new motor vehicle used for personal, family, or household purposes, plus any person who receives the vehicle by transfer during the warranty period (a limited pass-through to subsequent owners).

The exclusions:

Trucks with a gross vehicle weight (GVW) of 15,000 pounds or more. The 15,000 lb cap is on the higher (more inclusive) side compared to other states:

The residential portion of motor homes (components designed, used, and maintained primarily for residential purposes).

Vehicles purchased for resale or commercial lease purposes.

Used vehicles. Montana's lemon law applies to new vehicles only; used vehicles are subject to the implied warranty framework and the federal Magnuson-Moss Warranty Act, but not the §61-4-501 lemon law.

What is the 2-year / 18,000-mile warranty period?

Montana's lemon law warranty period ends at 2 years from original delivery or 18,000 miles of operation, whichever comes first. The 18,000-mile cap is distinctive to Montana, falling between the more common 12,000-mile and 24,000-mile thresholds used by other states. Written notice during this period preserves the consumer's rights.

Per MCA §61-4-501(7), the "warranty period" is the period ending:

2 years after the date of original delivery to the consumer; OR

During the first 18,000 miles of operation,

WHICHEVER IS EARLIER.

The 18,000-mile cap is the distinctive Montana feature. The following table shows how Montana's mileage threshold compares to other states:

Montana's 18,000-mile threshold is in between, which gives drivers more mileage than the 12,000-mile states but less than the 24,000-mile states.

The 2-year time component is on the longer (more consumer-favorable) side; many states use 1 year. The combination of 2 years and 18,000 miles means that for low-mileage drivers, the 2-year cap controls (more favorable than 1-year states), while for high-mileage drivers, the 18,000-mile cap controls.

Per MCA §61-4-502, if a consumer notifies the manufacturer in writing during the warranty period that the vehicle does not conform to the express warranties, the repairs necessary to conform the vehicle must be made by or at the expense of the warrantor, regardless of the expiration of the warranty period after the notification. This is the conventional rule that timely written notice preserves the consumer's rights even if the warranty period expires during the repair process.

The warranty period extends to equal any time that repair services are unavailable because of war, invasion, strike, fire, flood, or other natural disaster.

How many repair attempts trigger Montana's lemon law?

Montana requires either 4 or more repair attempts for the same defect, or 30 or more business days out of service during the warranty period, to establish a presumption that reasonable repair attempts have been made. Both thresholds must occur within the 2-year / 18,000-mile warranty window.

Per MCA §61-4-504, a reasonable number of attempts to conform the vehicle is presumed when, during the warranty period:

The same nonconformity has been subject to repair 4 or more times by the manufacturer or its agent or authorized dealer, but the nonconformity continues to exist; OR

The motor vehicle is out of service because of nonconformity for a cumulative total of 30 or more business days during the warranty period, after notification of the manufacturer, agent, or dealer.

The following table compares repair attempt thresholds across states:

The 30 business day OOS threshold is consumer-favorable in calendar terms (business days exclude weekends and holidays, so 30 business days equals 6+ weeks of calendar time).

Unlike Idaho and West Virginia, Montana does not have a distinctive 1-attempt safety threshold for serious safety defects. The 4-attempt or 30-business-day standard applies to all qualifying defects, including safety defects.

What prior notice must you give the manufacturer?

Before the lemon law presumption applies, Montana requires the consumer to provide prior written notice to the manufacturer and allow an opportunity to cure the defect. Notice should be sent by certified mail during the warranty period, identifying the vehicle by VIN, describing the defect, and listing previous repair attempts.

Per MCA §61-4-504, the presumption may not apply against a manufacturer who has not received prior written notification from or on behalf of the consumer and has not had an opportunity to cure the alleged defect.

The notice requirement is procedural. The manufacturer must receive written notice (not just oral notice to the dealer) and must have an opportunity to cure before the lemon law presumption applies.

The standard practice is to send written notice to the manufacturer by certified mail with return receipt. The notice should identify the vehicle (VIN, year, make, model), describe the defect, identify the repair attempts to date, and demand a final cure opportunity. The notice should be sent during the warranty period (within 2 years or 18,000 miles).

What is the substantial impairment standard?

Under Montana's lemon law, the qualifying defect must substantially impair the vehicle's use and market value, or its safety, for the consumer. This standard combines both use/value impairment and safety impairment as independent qualifying grounds, meaning either type of substantial impairment is sufficient.

The qualifying defect must "substantially impair the use and market value or safety" of the vehicle to the consumer. The Montana standard combines "use and market value" with "safety"; a defect that substantially impairs use and market value qualifies, and a defect that substantially impairs safety also qualifies.

What remedy does Montana's lemon law provide?

Montana's lemon law entitles the consumer to either a replacement vehicle of the same model and equal value, or a full refund of the purchase price plus collateral charges and incidental damages, less a reasonable use allowance. Notably, the manufacturer, not the consumer, chooses between replacement and refund.

Under MCA §61-4-503, if after a reasonable number of attempts the manufacturer or its agent or authorized dealer is unable, during the warranty period, to conform the vehicle to any applicable express warranty:

The manufacturer must replace the vehicle with a new motor vehicle of the same model and style and of equal value. If, for reasons of lack of availability, replacement of the same model and style is impossible, the manufacturer must replace it with a motor vehicle of comparable market value.

As an alternative to replacement, the manufacturer may accept return of the vehicle and refund the full purchase price, plus reasonable collateral charges and incidental damages, less a reasonable allowance for the consumer's use.

Note that under the Montana framework, the manufacturer chooses between replacement and refund (the statute frames refund as the manufacturer's alternative to replacement). This is somewhat less consumer-favorable than states where the consumer chooses; in practice, the consumer's preference is often accommodated, but the statutory structure gives the manufacturer the election.

"Collateral charges" include sales tax, registration fees, license fees, and similar transaction costs. "Incidental damages" include towing, rental car expenses, and similar costs reasonably incurred due to the defect. The "reasonable allowance for use" is a mileage-based offset reducing the refund by the value of the consumer's use of the vehicle.

Enforcement and the Montana DOJ

The Montana Department of Justice Office of Consumer Protection oversees lemon law enforcement, handles consumer complaints, and provides guidance on the claims process. Montana lemon law claims are typically paired with a federal Magnuson-Moss Warranty Act claim, whose fee-shifting provision makes professional legal representation economically viable.

The Montana Department of Justice Office of Consumer Protection oversees enforcement of the lemon law and provides resources for consumers who believe they have a lemon. The Montana DOJ Office of Consumer Protection handles consumer complaints and can provide guidance on the lemon law process.

The framework also works alongside:

The federal Magnuson-Moss Warranty Act, which provides additional remedies (including attorney's fees) for warranty-covered defects.

The Montana Uniform Commercial Code, which provides UCC remedies for breach of warranty (rejection, revocation of acceptance, and similar).

For most lemon law cases, the federal Magnuson-Moss claim is filed alongside the state lemon law claim, with the federal fee-shifting provision providing the economic foundation for representation.

What is the statute of limitations for a Montana lemon law claim?

Montana does not have a lemon-law-specific limitations period. Instead, the general UCC breach of warranty statute of limitations under MCA section 30-2-725 applies, providing a 4-year window from when the cause of action accrued. This is longer than the lemon-law-specific deadlines in many other states.

The §61-4-501 framework does not specify a separate limitations period for lemon law claims. Montana's general statute of limitations for breach of warranty under the UCC (MCA §30-2-725) is four years from when the cause of action accrued.

For lemon law purposes, accrual is generally treated as the date the manufacturer's failure to cure becomes definitive. The 4-year UCC window is longer than the lemon-law-specific limitations periods used in many states (Vermont 1 year, New Mexico 18 months).

The Magnuson-Moss claim has its own 4-year limitations period; for cases involving both state and federal claims, the longer applicable period controls.

How does Montana's lemon law compare to other states?

Montana's lemon law is moderate overall. Its 4-attempt threshold and manufacturer-chosen remedy are less consumer-favorable, while its 2-year time component, 30-business-day out-of-service threshold, 15,000 lb GVW cap, and 4-year statute of limitations are more consumer-favorable. The 18,000-mile warranty cap is uniquely mid-range.

Practical guidance

Montana consumers pursuing a lemon law claim should track the 2-year / 18,000-mile warranty period carefully, document all repair attempts with dated repair orders, send certified written notice to the manufacturer, and continue using authorized dealers for warranty repairs. Filing a parallel federal Magnuson-Moss claim strengthens the case.

For Montana consumers with a potential lemon law claim:

Track the 2-year / 18,000-mile warranty period carefully. The 18,000-mile cap is the distinctive Montana threshold; for high-mileage drivers, it can close the window before the 2-year mark. The first repair attempt for the qualifying defect must occur within this period.

Document the four repair attempts thoroughly. The 4-attempt threshold requires substantial documentation; dated repair orders with specific defect descriptions are the foundation.

Track business days (not calendar days) for the OOS calculation. 30 business days is the threshold; weekends and holidays don't count toward it.

Send written notice to the manufacturer by certified mail. The §61-4-504 notice requirement is procedural but strictly applied; the manufacturer must receive prior written notice and an opportunity to cure before the presumption applies.

Don't stop taking the vehicle in for repairs. You need to establish a record of repair attempts; if you stop going to the authorized dealer, you may not meet the threshold. And use the authorized dealer, not an independent mechanic, for warranty repairs.

Use the Montana DOJ Office of Consumer Protection as a resource. The office provides guidance and handles consumer complaints.

For substantial claims, file the Magnuson-Moss federal claim alongside the state claim. The federal fee-shifting provision makes professional representation economically viable.

The Montana framework is moderate. The 4-attempt threshold and the manufacturer's election between replacement and refund are the less consumer-favorable elements; the 2-year time component, the 30-business-day OOS threshold, and the inclusive 15,000 lb GVW cap are the more favorable elements. Consumers who document their cases properly and follow the procedural sequence have a reliable path to remedy.