2018 Toyota Corolla: Mice ate soy wiring
Common wear/failure (not a recall)
Symptoms
Owners of the 2018 Corolla report: mice ate soy wiring. CarComplaints.com lists 2 owner complaints, average mileage 15,000 miles.
NHTSA has 13 owner complaints for the 2018 Corolla in this area. Examples:
- NHTSA complaint ODI #11694221 (filed 10/18/2025): “After having no indication of any issue, my 2018 toyota corolla has stopped re-starting after fueling. the only light that appeared was regarding my battery. my battery is brand new and tested.…”
- NHTSA complaint ODI #11682844 (filed 08/25/2025): “Odometer fraud. the contact purchased a 2018 toyota corolla. the contact discovered a mileage discrepancy after the purchase. the vehicle was a private sale. at the time of purchase, the vehicle mileage was approximately 85,000. the contact later discovered th…”
Likely causes
Sources do not establish a single root cause; diagnosis is needed. Owner-reported fixes are listed below.
Fix, in plain English
Most common owner-reported solutions on CarComplaints.com: new wiring (1 reports) toyota offered zero (1 reports). Check for open recalls and extended warranty coverage with a dealer before paying out of pocket.
DIY difficulty: Moderate
Finding and splicing chewed wiring is doable with a multimeter and patience but can be time-consuming; harness replacement is pro work. (Our assessment.)
Cost
CarComplaints.com owners report a typical repair cost of about $410 (owner-reported average, not a quote).
Typical parts (search links, no affiliate codes)
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