They chewed up wiring in my previous 2007 truck four times to the tune of about $400 each time. And built nests under the hood while they were at it. Tried mothballs, fox urine (from hunting supply store), dryer sheets. Nothing worked. Found
Cridder Ridder at Home Depot. Sprayed all wiring under the hood every couple months and no more problem. Don't know if that would work in your case or not.
Found out later that some wire manufacturers used a soy based insulation material that attracted rodents. They never bothered my wife's car, daughter's car, or my newer truck, or my older truck. Just that one.