2018 Hyundai Sonata Electrical System Problems
Owners have filed 60 complaints with NHTSA about electrical system problems on the 2018 Hyundai Sonata, 16% of all complaints for this model year. Half of the reports with a mileage happened before 21,250 miles. The words owners use most often: “knock sensor” (12% of reports).
- 60electrical system complaints
- 21,250median miles at failure
- 3mention a crash
- 2mention an injury
- 0related recalls
- 52%of reports with a speed happened at 50+ mph
What owners describe
Phrases that appear unusually often in these complaints compared with complaints about other cars.
- Knock sensor: mentioned in 7 of 60 complaints (12%)
- Wiring harness: mentioned in 6 of 60 complaints (10%)
At what mileage do electrical system problems happen?
Based on 26 complaints that reported the odometer reading.
How serious are the reports?
Of 60 complaints, 3 mention a crash, 4 a fire, 2 an injury.
Hyundai Sonata electrical system complaints by model year
| Model year | Electrical System complaints | Share of that year | Median miles |
|---|---|---|---|
| 2025 Sonata | 1 | 6% | — |
| 2024 Sonata | 18 | 39% | 9,000 |
| 2023 Sonata | 12 | 14% | — |
| 2022 Sonata | 17 | 18% | 70,000 |
| 2021 Sonata | 17 | 13% | — |
| 2020 Sonata | 40 | 22% | 10,000 |
| 2019 Sonata | 12 | 7% | 32,000 |
| 2018 Sonata | 60 | 16% | 21,250 |
| 2017 Sonata | 65 | 8% | 24,598 |
| 2016 Sonata | 89 | 12% | 85,200 |
| 2015 Sonata | 167 | 15% | 57,321 |
| 2014 Sonata | 135 | 18% | 78,000 |
| 2013 Sonata | 261 | 14% | 84,000 |
| 2012 Sonata | 234 | 15% | 80,000 |
| 2011 Sonata | 443 | 13% | 58,000 |
| 2010 Sonata | 16 | 5% | 55,122 |
| 2009 Sonata | 61 | 13% | 80,248 |
| 2008 Sonata | 32 | 8% | 79,500 |
| 2007 Sonata | 51 | 7% | 98,000 |
| 2006 Sonata | 86 | 8% | 78,000 |
| 2005 Sonata | 19 | 12% | 69,000 |
| 2004 Sonata | 17 | 8% | 98,000 |
| 2003 Sonata | 19 | 10% | 45,000 |
| 2002 Sonata | 23 | 7% | 75,500 |
| 2001 Sonata | 9 | 4% | 44,001 |
| 2000 Sonata | 37 | 13% | 90,000 |
| 1999 Sonata | 11 | 9% | 70,000 |
| 1998 Sonata | 4 | 8% | 62,500 |
| 1997 Sonata | 5 | 10% | 108,000 |
| 1996 Sonata | 5 | 22% | — |
| 1995 Sonata | 8 | 12% | — |
When owners reported it
Related recalls (0)
No safety recall lists electrical system for the 2018 Hyundai Sonata. A pattern of complaints does not always lead to a recall.
What owners report
Short excerpts of recent complaints, with personal details removed. Full reports are on NHTSA.gov.
We think thereâs an issue with the abs module and wheel speed sensor because we started having a problem where the brakes wouldnât 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 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…
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…
Frequently asked questions
Do all 2018 Hyundai Sonatas have electrical system problems?
No. NHTSA has 60 owner complaints about electrical system for the 2018 Hyundai Sonata (16% of the 374 complaints for this model year). Complaint data shows that the problem is reported, not how many of all cars sold are affected.
Was there a recall on the 2018 Hyundai Sonata electrical system?
No recall currently lists electrical system for this vehicle.
At what mileage do electrical system problems start?
The median reported mileage is 21,250 miles: half of the reports with a mileage came before that.
What do owners say about electrical system problems on the 2018 Hyundai Sonata?
The most frequent phrase is “knock sensor”, in 7 of 60 complaints, followed by “wiring harness” (6).
Other 2018 Hyundai Sonata problems
- Engine problems (212)
See all 2018 Hyundai Sonata problems or electrical system problems across all Sonata years.