2021 Hyundai Sonata Hybrid

No clear pattern

0% of complaints about the 2021 Hyundai Sonata Hybrid arrived in its first year of service. That is an unusual figure for a 2021 vehicle, but with only 71 complaints on record the sample is too small to call it a pattern — the margin of error covers the range where ordinary vehicles sit. The figures below are reported without a verdict. The most-reported system is electrical system (26 complaints), typically at 3.8 yr or about 24,000 miles.

Complaints: 71
Median age at failure: 3.5 yr
Median mileage: 32,547 n=2
Crash / fire / tow: 4.2% of reports
Safety recalls: 0

In owners’ own words

Electrical system mileage not reported 3.5 yr in service

The Battery dies randomly (like I have to open the car with they physical key to access the car dead) there isn't a pattern. I have taken it to the dealership and they can't diagnose it because they cant replicate the issue and say nothing is wrong. Sometimes the car dies while I'm INSIDE and just having lunch while the car is off.

Electrical system mileage not reported 3.5 yr in service

The Battery dies randomly and requires the physical key to unlock the door. It is a hybrid, so it has a 12 volt battery button that jumpstarts the car. While driving the vehicle, the battery meter on the dashboard will show a near-full battery and then a near-empty battery within a few minutes. This vehicle was bought brand new from a Hyundai dealership and for the first 2 years, there wasn't an issue. The past few months, the battery issue started.

Electrical system mileage not reported 3.5 yr in service

The Battery dies randomly and requires the physical key to unlock the door. It is a hybrid, so it has a 12 volt battery button that jumpstarts the car. While driving the vehicle, the battery meter on the dashboard will show a near-full battery and then a near-empty battery within a few minutes. This vehicle was bought brand new from a Hyundai dealership and for the first 2 years, there wasn't an issue. The past few months, the battery issue started.

Engine mileage not reported 2.8 yr in service

the coolant reservoir has been dropping showing levels below min even after topping it off

Other Sonata Hybrid model years

How to read this

This is what owners reported, not a reliability rating. People file with NHTSA about alarming failures, not routine ones, and complaint volume tracks how many cars were sold.
Failure ages come from the incident date on each complaint, populated on about 83% of records. Mileage is shown where reported — NHTSA’s 2021 system change cut mileage capture to roughly 15%, so it thins out sharply after MY2020.
Every rank compares this vehicle only against others of the same model year. A 2025 car has not had time to accumulate five-year failures, so comparing early-failure share across years is meaningless.
Fourteen make-months distorted by media storms and mass recalls — Toyota in February 2010 ran 11× normal volume across 33 models — are excluded.
Recalls are manufacturer actions and authoritative; complaints are not. A recall listed here may already have been performed on any individual car. Check a specific VIN at nhtsa.gov/recalls.

2021 Hyundai Sonata Hybrid

When each system is reported — middle 50% of complaints

In owners’ own words

Other Sonata Hybrid model years

How to read this