Showing the 2021 Sonata Blue. NHTSA's VIN data shows it with a 2.0 L engine, but that may not be every version of it, so the numbers below cover every version of this model year. Every version
Owner complaints, recalls, fuel economy and safety ratings from public NHTSA and EPA data, updated Oct 17, 2026.
Fuel economy
27–52 mpgcombined; city 23–50, highway 33–54; every version of this model year
Five years of fuel
$6,250–$12,030U.S. average; Ohio $5,580–$10,750 at local prices; every version of this model year; fuel only, not other costs of owning it; 15,000 miles a year, at EIA fuel prices for the week of Oct 12, 2026
NHTSA's VIN data lists these trims for the 2021 Sonata. A trim's engine and numbers are shown as its own only where EPA names versions after the trim and no other version could be it; "seen with" means a source shows that engine on the trim, not that it was the only one. Recalls and complaints cover the whole model year: whether a recall applies to a car depends on its VIN, on NHTSA's recall lookup.
Owners have filed 189 complaints with NHTSA about the 2021 Sonata. These are unverified owner reports, counted by the part of the car they name; one complaint can name several parts. Counts aren't adjusted for how many were sold, so they don't show how reliable a car is.
Complaints by part of the car
Part
Complaints
Crashes
Fires
Injuries
Engine
55
1
0
0
Electrical system
42
0
0
0
Unknown or other
39
3
0
5
Power train
29
0
0
0
Fuel/propulsion system
26
1
0
5
Fuel system, gasoline
13
0
0
1
Forward collision avoidance
12
3
0
9
Visibility/wiper
9
0
0
0
Structure
5
0
0
0
Air bags
4
2
0
7
Engine and engine cooling
4
0
0
0
Visibility
4
0
0
0
9 more parts
Lane departure
3
0
0
0
Service brakes
3
1
0
0
Seat belts
2
0
0
0
Seats
2
0
0
0
Steering
2
0
0
0
Vehicle speed control
2
0
0
0
Parking brake
1
1
0
0
Suspension
1
0
0
0
Tires
1
0
0
0
Complaints by model year
Newer years have had less time to collect complaints, and counts aren't adjusted for sales, so a shorter bar doesn't mean a more reliable year.
NHTSA lists 4 recall campaigns for the 2021 Sonata over its history. Campaigns are matched by model and year, so each one may apply to a given car, and its repair may already be done: check a VIN on NHTSA's recall lookup for the open recalls on that exact car.
Hyundai Motor America (Hyundai) is recalling certain 2020-2023 Sonata vehicles. A damaged check valve can allow air to enter the fuel tank, causing it to expand and contact hot exhaust components, melting the tank.
Risk: A melted fuel tank can leak, increasing the risk of a fire.
Remedy: Dealers will inspect and replace the check valve. The fuel tank assembly will be inspected for damage and replaced if necessary. Additionally, dealers will inspect and update the engine control unit software. All repairs will be performed as necessary, free of charge. Owner notification letters were mailed beginning March 13, 2026. Owners may contact Hyundai customer service at 1-855-371-9460. Hyundai's number for this recall is 286. Vehicle Identification Numbers (VINs) involved in this recall became searchable on NHTSA.gov on November 19, 2025.
Hyundai Motor Company (Hyundai) is recalling certain 2021-2022 Santa Fe, Sonata, Veloster N, 2022 Santa Cruz, Elantra N, and Kona N vehicles. The vehicle's "fail-safe" limited-mobility drive mode may be impaired, when prompted by a transmission oil pump malfunction, which can result in a complete loss of drive power.
Risk: Loss of drive power increases the risk of a crash.
Remedy: Dealers will inspect and replace the transmission, as necessary. Dealers will also update the transmission control unit software. All repairs will be performed free of charge. Owner notification letters were mailed January 10, 2023. Owners may contact Hyundai customer service at 1-855-371-9460. Hyundai's number for this recall is 236.
Hyundai Motor America (Hyundai) is recalling certain 2020-2021 Santa Fe, 2021 Sonata, and Elantra vehicles. During manufacturing, the windshield may not have been properly bonded to the vehicle, allowing it to detach in a crash.
Risk: A windshield that detaches from a vehicle during a crash can increase the risk of injury.
Remedy: Dealers will remove and reinstall the front windshield panel, free of charge. Owner notification letters were mailed June 20, 2022. Owners may contact Hyundai customer service at 1-855-371-9460. Hyundai's number for this recall is 216.
Hyundai Motor America (Hyundai) is recalling certain 2021-2022 Santa Fe and Sonata vehicles equipped with 2.5L turbocharged engines. Fuel may leak at the pipe connection between the high-pressure fuel pump and fuel rail.
Risk: A fuel leak increases the risk of a fire.
Remedy: Dealers will inspect and tighten, or replace the fuel pipe as necessary, free of charge. Owner notification letters were mailed on September 3, 2021. Owners may contact Hyundai customer service at 1-855-371-9460. Hyundai's number for this recall is 207.
Carmakers sent NHTSA 109 service bulletins and notices that cover the 2021 Sonata, the latest on Oct 8, 2026. They tell dealers how to fix known issues.
The parts they mention most: power train (33), engine and engine cooling (26), electrical system (24), equipment (9), engine (8).
NHTSA defect investigations
Opening an investigation isn't a finding of a defect. Outcomes are as NHTSA's summary states them. A recall is shown as an investigation's outcome only where NHTSA's summary names it; other recalls NHTSA's file lists with it are marked as listed, not caused.
Investigation
Part
Opened
Status
Defect petition DP22005 Pedestrian alert sounds · covers 43 makes
The owner's manual gives the oil and how often to change it. We show oil facts only once we've checked them against the manual, and we haven't yet for the 2021 Sonata.
These are searches on those sites; we don't copy or check their listings. Your ZIP is used for these links and never kept.
Specs
EPA class: large cars. EPA greenhouse gas score: 6–9 out of 10. Each version EPA tested:
Swipe the table sideways for more columns.
Version
Engine
Transmission
Fuel
City / hwy / comb
Sonata Front-Wheel Drive
2.5 L, 4 cyl
Automatic (S8)
Regular Gasoline
28 / 38 / 32
Sonata Front-Wheel Drive
2.5 L, 4 cyl
Automatic (S8)
Regular Gasoline
27 / 37 / 31
Sonata Front-Wheel Drive
1.6 L, 4 cyl, turbo
Automatic (S8)
Regular Gasoline
27 / 37 / 30
Sonata Front-Wheel Drive
2.5 L, 4 cyl, turbo
Automatic (AM-S8)
Regular Gasoline
23 / 33 / 27
Sonata Hybrid Front-Wheel Drive
2.0 L, 4 cyl
Automatic (AM-S6)
Regular Gasoline
45 / 51 / 47
Sonata Hybrid Blue Front-Wheel Drive
2.0 L, 4 cyl
Automatic (AM-S6)
Regular Gasoline
50 / 54 / 52
Sources and dates
U.S. EPA fuel economy data, file of Sep 29, 2026
NHTSA owner complaints, file of Oct 17, 2026
NHTSA recalls, file of Oct 17, 2026
NHTSA manufacturer communications, file of Oct 17, 2026
NHTSA defect investigations, file of Oct 17, 2026
NHTSA 5-Star Safety Ratings, file of Aug 7, 2026
U.S. Energy Information Administration, file of Oct 12, 2026
Fuel cost: EPA mpg with fuel prices for the week of Oct 12, 2026 and electricity prices for Jul 2026. Source: U.S. Energy Information Administration (Oct 2026). Complaints are unverified reports owners filed with NHTSA. About the data