Full List of Cars with Soy-Based Wiring (2025 Update)

In the last fifteen years, vehicle manufacturers around the world have adopted more eco-friendly practices — including the use of soy-based wire insulation. Compared to traditional petroleum-based coatings, soy wiring is biodegradable, renewable, and better for the environment.

But has this shift come with an unexpected — and expensive — downside?

Several class-action lawsuits against major auto manufacturers have alleged that soy-based wiring attracts rodents, leading to chewed electrical systems and thousands of dollars in vehicle repairs.

Let’s take a closer look.

Complete List of Vehicles That Use Soy-Based Wiring

If your vehicle was made in the last decade, it very likely includes soy-based wire insulation. Most automakers have made the switch, but the exact implementation varies by brand and model year.

Below is a list of popular vehicles that are known or reported to use soy-based wiring:

Toyota

• Camry
• Corolla
• RAV4
• Highlander
• Tacoma
• 4Runner
• Prius

Honda

• Accord
• Civic
• CR-V
• Odyssey

Hyundai

• Elantra
• Santa Fe
• Sonata

Kia

• Soul
• Sorento
• Sportage
• Optima

Ford

• F-150
• Fusion
• Explorer

Nissan

• Rogue
• Altima
• Sentra
• Pathfinder
• Kicks

Stellantis Brands

• Dodge (e.g., Charger, Durango)
• Jeep (e.g., Cherokee, Wrangler)
• Chrysler (e.g., Pacifica, 300)
• Ram (e.g., Ram 1500)

General Motors

• Chevrolet (e.g., Silverado, Malibu)
• GMC (e.g., Sierra, Terrain)
• Buick (e.g., Encore, Enclave)

European Brands

• Audi
• BMW
• Mercedes-Benz
• Porsche
• Volkswagen

Electric Vehicles

• Tesla
• Rivian
• Polestar

Note: This list is based on owner reports, industry analysis, and legal filings. For confirmation about your specific model, contact your dealership or trusted mechanic.

Class-Action Lawsuits Against Vehicle Manufacturers 

Between 2015 and 2020, several class-action lawsuits were filed against Honda and Toyota, claiming that soy-based wiring increased the risk of rodent damage.

One notable case was brought by Michael Preston against Honda. He argued that Honda knew of the problem — as evidenced by its sale of a specialized “Rodent Deterrent Tape” — but failed to properly warn consumers.

However, in each case, courts dismissed the lawsuits, citing insufficient evidence that soy-based wiring attracted rodents more than petroleum-based wiring.

Both Honda and Toyota denied responsibility and declined to cover such damage under warranty.

How Much Does It Cost to Repair Chewed Wiring?

Rodent-chewed wiring can cost anywhere from a few hundred to several thousand dollars to repair. Labor costs often spike due to the complexity of modern vehicle electrical systems.

While comprehensive auto insurance may cover rodent damage, claims are not always approved. If your insurer determines the issue stems from neglect (such as failing to clean the storage area or experiencing repeat infestations), your claim could be denied.

RV and trailer owners should be especially cautious, as rodent damage is often excluded from their policies.

If you are curious how much rodent-related repairs might cost you, use our free Rodent Damage Cost Calculator.

Are Rodents Attracted to Soy-Based Wiring?

There is no definitive scientific evidence that soy-based insulation attracts rodents more than other wire coatings. Rodents chew on wiring of all kinds — not because of what it’s made of, but because they need to gnaw to survive.

A rodent’s teeth can grow up to 1mm a day. Chewing keeps them sharp and healthy, and wiring just happens to be a convenient target.

Additionally, today’s cars contain more complex electrical systems than ever before — meaning more wires are at risk, and repairs require more labor and specialized knowledge.

What Kind of Rodents Chew on Car Wiring?

If it fits, it chews. The most common culprits include:

• Mice
• Rats
• Squirrels
• Chipmunks

How Do You Stop Rodents from Chewing Car Wires

Prevention is key. Once rodents settle in, the damage can escalate quickly. For a full guide, check out our earlier post: 7 DIY Tips to Rodent Proofing Your Car.

In the meantime, here are the three most effective deterrents:

1) Seal All Entry Points

Rodents can squeeze through cracks as small as 1/4 inch. If you store your car in a garage or unit, inspect for holes along the floor, walls, and ceiling. Mice are excellent climbers — don’t overlook roof gaps or vents.

2) Remove Foode, Garbage, and Nesting Materials

Scraps, wrappers, old rags, and even leaves can serve as attractive nesting material. Keep both the interior and surrounding area clean and clear of clutter.

3) Install a Box-Kat mouse barrier around the vehicle

The Box-Kat is a patented, flexible rodent barrier designed to surround your car and block rodents from reaching your engine bay. Its adjustable panels adapt to uneven ground, and its 14-inch height prevents even athletic mice from leaping over.

Check out our full set of Box-Kat kits to find a barrier for your needs!