Full List of Cars with Soy-Based Wiring (2026 Update)
Many automakers have adopted soy-based wire insulation since the mid-2010s for environmental reasons, but some vehicle owners report increased rodent damage, leading to costly repairs. Class-action lawsuits against Honda and Toyota alleged soy wiring attracts rodents, though courts dismissed the claims due to lack of scientific evidence. While manufacturers deny liability, products like Honda's capsaicin-infused 'rodent tape' are marketed as deterrents. Prevention through sealing entry points, cleanliness, and physical barriers remains the most effective strategy against rodent damage.
- ▪Soy-based wire insulation is used in many vehicles made in the last decade, including models from Toyota, Honda, Ford, GM, and several European and electric vehicle brands.
- ▪Multiple class-action lawsuits against Honda and Toyota over soy-based wiring attracting rodents were dismissed due to insufficient evidence.
- ▪Honda offers a capsaicin-coated 'rodent tape' to deter chewing, though its effectiveness is anecdotal and not guaranteed.
- ▪Repair costs for rodent-chewed wiring can range from hundreds to thousands of dollars, and insurance claims may be denied if neglect is suspected.
- ▪Rodents chew wiring to manage tooth growth, and they are not scientifically proven to prefer soy-based insulation over other materials.
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Full List of Cars with Soy-Based Wiring (2026 Update) March 24, 2025 Share Share Link Close share Copy link (Updated January 8, 2026) 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.
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