The Edible Engine
January 5, 2025
You may have had a friend whose vehicle was the victim of hungry rodents. After all, mice, rats and squirrels—even rabbits—have been known to gnaw on wires in engine compartments, causing vehicle electrical systems to go haywire. They can disable a vehicle completely and be very expensive to fix.
In 2017, some drivers noticed their vehicle's wiring was being chewed and found out the automaker was using a relatively new material for covering their wires: soy. Many of the repairs to their new vehicles weren't covered under warranty by the manufacturer when it was discovered rodents were eating the wiring. So the owners filed a class action suit, saying the soy covering was essentially baiting the critters.
The automakers tell a different story, saying mice, rats and squirrels have been chewing through wire insulation long before it was made out of soy.
Regardless of what the insulation is made of, vehicle owners should make sure rodents aren't chowing down and creating a problem in the engine compartment. They can have their repair facility check for these signs: Little bits of acorns, leaves, chewed up plastic and animal droppings in the engine's nooks and crannies. Using a black light, your technician can detect animal urine, a sure sign that they've been using your engine compartment as a warm apartment, a nest and a dining room.
You can take steps to prevent rodents from chomping your vehicle's parts. Honda—one of the vehicle manufacturers that uses soy-based wiring covering—makes a rodent tape. It contains a spice called capsaicin that rodents find too hot to handle. Other preventative measures include installing metal mesh around wiring harnesses or spraying the engine compartment with special rodent-repellants.
Rodent damage can cost one vehicle owner thousands of dollars to fix, not the kind of bite anyone wants taken out of their bank account.
Need Service?
More articles from Ron's Auto Service

Alleviate the Creaks and Squeaks (Chassis Lubrication)
February 16, 2025
If your vehicle creaks and squeaks when you drive down the road, it may mean that some of the metal parts are rubbing against each other and need to be lubricated. Those could be parts of the suspension, steering system and the drivetrain. Years ago, most vehicles had to have their chassis (wha... More

Why You Have an O2 Sensor (Oxygen Sensor)
February 9, 2025
If someone asked you what gas made up the largest portion of the atmosphere, what would you guess? Well, it's not oxygen; it only makes up 20.9 percent. But since we're talking about oxygen, you should know that your vehicle uses oxygen sensors to make sure your engine is running the way it shou... More

Put the Brakes On! (Brake Caliper Replacement)
February 2, 2025
Keeping your vehicle's brakes in top shape is one of the most important things you can do for your safety and those on the road with you. Most drivers know a little about brake pads and rotors but maybe not so much about another brake component called the calipers. Disc brakes work by a mechanica... More