2020 Hyundai Sonata: Blindspot collision warning system wire burnt or chewed
Common wear/failure (not a recall)
Symptoms
Owners of the 2020 Sonata report: blindspot collision warning system wire burnt or chewed. CarComplaints.com lists 1 owner complaints, average mileage 7,450 miles.
NHTSA has 40 owner complaints for the 2020 Sonata in this area. Examples:
- NHTSA complaint ODI #11762639 (filed 09/07/2026): “A/c blower motor fan would stop working. happened twice within less than a year apart. upon further inspection, multi fuse wiring overheated and melted, ruining fuse and making a/c stop working during 100 temperatures outside. apparently this is a well known i…”
- NHTSA complaint ODI #11761900 (filed 09/03/2026): “I am submitting a safety complaint regarding a recurring, unresolved electrical defect in my 2020 hyundai sonata sel. the vehicle fails to recognize when the ignition is switched off, leaving core vehicle systems active and causing severe parasitic battery dra…”
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 $950 (owner-reported average, not a quote).
Typical parts (search links, no affiliate codes)
AutoZone · O'Reilly · Advance · RockAuto
Sources
- CarComplaints.com: Blindspot collision warning system wire burnt or chewed (2020 Sonata)
- NHTSA complaints API, 2020 Sonata
Page last updated .