2018 Hyundai Sonata: Rodents eating soy-based wires
Common wear/failure (not a recall)
Symptoms
Owners of the 2018 Sonata report: rodents eating soy-based wires. CarComplaints.com lists 2 owner complaints, average mileage 1,900 miles.
NHTSA has 60 owner complaints for the 2018 Sonata in this area. Examples:
- NHTSA complaint ODI #11732415 (filed 04/20/2026): “We think there’s an issue with the abs module and wheel speed sensor because we started having a problem where the brakes wouldn’t work or would stutter. the car would shake real bad it would make an awful grinding sound but normally only when trying to stop a…”
- NHTSA complaint ODI #11724392 (filed 03/15/2026): “The vehicle had safety and mechanical problems shortly after purchase, even with low mileage. the issues included warning lights, abnormal noises, repeated mechanical failures, and poor performance that affected the safe operation of the vehicle. these problem…”
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: none clearly reported. 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 $350 (owner-reported average, not a quote).
Typical parts (search links, no affiliate codes)
AutoZone · O'Reilly · Advance · RockAuto
Sources
Page last updated .