2018 Hyundai Sonata: Electrical System complaints
Owner-reported issue (NHTSA complaints, not a recall)
Symptoms
NHTSA has 60 owner complaints for the 2018 Hyundai Sonata that list the electrical system component. Complaints are individual owner reports, not verified defects.
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 at higher speeds or long braking. the onl…”
- 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 problems started early and continued over time …”
- NHTSA complaint ODI #11718006 (filed 02/14/2026): “To whom it may concern, my name is [xxx] , and i am formally escalating serious ongoing issues with my 2018 hyundai sonata. despite repeated attempts to resolve these concerns through the dealership, my vehicle continues to experience excessive oil consumption, engine failures, and additional mechan…”
Likely causes
These complaints do not establish a single root cause; read the examples above and get a diagnosis.
Fix, in plain English
No single fix is established by these reports. Check your VIN for open recalls at nhtsa.gov/recalls, ask a dealer about technical service bulletins (TSBs) or extended warranty coverage, then have the system diagnosed.
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
No sourced cost range for this issue. Get a written quote after diagnosis.
Typical parts (search links, no affiliate codes)
AutoZone · O'Reilly · Advance · RockAuto
Sources
Page last updated .