Every safety complaint, recall and defect investigation the US government
holds on this vehicle.
Owners have filed 55 safety complaints
about the 2021 Hyundai Sonata Hybrid with the US government. Of those, 1 describes a crash, 2 people were injured and no death is recorded. No recall campaign has been matched to this year, make and model.
The most complained-about system is the electrical system,
named in 25 complaints, 45% of the total.
Compiled from NHTSA's complaint, recall and investigation files
· Covers October 2021 to September 2026 · How this is counted
What is on file
55 complaints on file
55
Complaints
1
Describe a crash
0
Mention fire
2
People injured
0
Deaths
A complaint is an unverified account by the person who filed it, not a
finding of fault. One complaint is one ODI number, which is how NHTSA counts
them.
Complaints halved year on year: 6 in the twelve months to 2026-Q2, against 17 in the twelve before.
No recall campaign was matched to this year, make and model. That is not
the same as a clean vehicle: recalls are issued against production
ranges, and the only reliable check is your own VIN.
Which system owners named
Complaints naming each system
ELECTRICAL SYSTEM 25 · 45%
25 45%
ENGINE 21 · 38%
21 38%
UNKNOWN OR OTHER 7 · 13%
7 13%
FUEL/PROPULSION SYSTEM 5 · 9%
5 9%
POWER TRAIN 4 · 7%
4 7%
ENGINE AND ENGINE COOLING 3 · 5%
3 5%
FORWARD COLLISION AVOIDANCE 3 · 5%
3 5%
STRUCTURE 1 · 2%
1 2%
TIRES 1 · 2%
1 2%
VISIBILITY/WIPER 1 · 2%
1 2%
01223
One complaint can name several systems, so these add up to more than 55.
When the complaints arrived
By the year NHTSA received them
By the year NHTSA received them, which is not the year the failures
happened. They peaked in 2024 at 22.
24 18 12 6
212021232023242024252025262026
This is the year the complaint was filed, not the year the failure
happened. The range runs from 2021 to 2026, the last of them a part year, which is why its column is drawn faint.
Crash test ratings
NHTSA New Car Assessment Program
NHTSA crashes a car into a barrier and a pole and measures what
happens to the dummies inside. This is what it awarded the 2021 Hyundai SONATA HYBRID, and it is a separate
question from what owners report going wrong later.
Test
4 DR FWD
Overall
Frontal crash
Frontal, driver
Frontal, passenger
Side crash
Side barrier
Side pole
Rollover
Chance of rollover
9.7%
Stability control standard Forward collision warning standard Lane departure warning standard
A dash means NHTSA did not rate that test for this vehicle.
Defect investigations
1 on file
An investigation means NHTSA has decided a pattern is worth examining. A
preliminary evaluation is often closed with no action; an engineering
analysis is the stage that usually precedes a recall.
Pedestrian alert sounds
DP22005
Closed defect petition · opened January 27, 2023 · closed August 7, 2023 · led to recall 22V063000
the electrical system
NHTSA received a petition on or about July 18, 2022, requesting that Federal Motor Vehicle Safety Standard (FMVSS) 141 be applied to all electric and hybrid vehicles operating in the United States. The petition can be reviewed at NHTSA.gov under ODI Number 11486072. FMVSS 141 establishes performance requirements for pedestrian alert sounds for motor vehicles. The standard applies to hybrid and electric vehicles that have a gross vehicle weight rating of 4,536 KG or less or are defined as low-speed vehicles. The standard became fully applicable to all such vehicles manufactured on or after March 1, 2021.On January 27, 2023, NHTSA opened Defect Petition (DP) 22-005 to evaluate the subject matter described in the petition. On June 24, 2023 and as supplemented on June 25, 2023, the petitioner notified NHTSA he was withdrawing his petition. The petitioner indicated that, based on his review of data, there is no justification for asserting potential benefits that could be derived from actions sought by my petition. Based on the petitioner's withdrawal, DP22-005 is closed. Closure of this DP does not represent a determination by NHTSA regarding the subject matter of the petition.
In owners’ own words
Quoted from the complaint file
Quoted from NHTSA's complaint file. These are unverified accounts by the
people who filed them, not findings of fault.
FORWARD COLLISION AVOIDANCE: WARNINGS
2 injured · crash · towed
The forward collision warning, automatic emergency braking and adaptive cruise control failed as the first 2 activated when there were no oncoming collisions in front of me and the nearest cars around me were 1/4 of a mile away. The cruise control failed as it turned back on after the vehicle veered off the highway and into the rest stop. My safety and the safety of a lot of other people in the rest stop were put at risk because the system malfunction and tripped when no other cars were present that would have led to a collision. The vehicle led me off the highway into the rest stop where others could have been fatally hurt. I ended up with a shattered left foot that required a major …
NHTSA complaint 11508517, quoted in part. Filed by an owner and not verified by NHTSA or by us.
POWER TRAIN
My Lincoln Nautilus (~9,180 miles) logged 6 "Powertrain Malfunction / Reduced Power" alerts in the [XXX] telematics system between XXX (XXX at 7:59 PM and 8:16 PM; XXX at 1:07 PM and 1:39 PM; XXX at 11:16 PM; and XXX at 10:56 AM). Out of the 6 logged events, I experienced severe loss of motive power during two of them. On XXX, while driving 70 mph on I-95, the vehicle completely lost all propulsion. Coasting without power, I was unable to pull fully onto the shoulder, leaving the car partially stuck in active traffic and narrowly escaping a high-speed collision. Once stopped, the vehicle failed to recognize that it was in Park, causing the electronic parking brake to lock without …
NHTSA complaint 11765198, quoted in part. Filed by an owner and not verified by NHTSA or by us.
FUEL/PROPULSION SYSTEM
The vehicle was brought to an authorized Hyundai dealer to have Service Campaign TBH and 94B completed. These campaigns were explicitly designed to prevent known mechanical defects (cracked EHRS assemblies and high-voltage battery errors). The software patches failed to protect the vehicle. The physical hardware has now catastrophically failed exactly as predicted by the campaign, resulting in extreme engine overheating and a physically swollen high-voltage battery pack. Hyundai is refusing to cover the cascading physical damage caused by their own failed campaign remedy, leaving me with an active safety and fire hazard. FUEL/PROPULSION SYSTEM" and explicitly state that the vehicle …
NHTSA complaint 11765311, quoted in part. Filed by an owner and not verified by NHTSA or by us.
ELECTRICAL SYSTEM
The vehicle experiences sudden, complete electrical power loss while driving at speed on highways and city streets or on the parking. All digital displays turn off, the engine shuts down, and power-assisted steering and braking are instantly lost without prior warning, presenting an extreme collision risk. The issue first occurred in August 2025 at approximately 48,000 miles and was taken to an authorized Hyundai dealer in Michigan for warranty repair. The dealer held the vehicle for over 30 days but failed to correct the defect. The identical power failure has continued and recently escalated to daily occurrences. A second Hyundai dealer (Pacifico Hyundai, Philadelphia, PA) diagnosed an …
NHTSA complaint 11755133, quoted in part. Filed by an owner and not verified by NHTSA or by us.
ELECTRICAL SYSTEM
I purchased this vehicle pre-owned approximately two years ago and have since developed concerns about its reliability, particularly related to the electrical and hybrid systems. In hindsight, I suspect these issues may be part of the reason the original owner traded it in to a CarMax dealer. Shortly after purchasing the vehicle, I began experiencing recurring problems with the 12V battery, including frequent instances requiring battery resets. Interestingly, these issues were significantly less frequent during colder weather. More recently, as temperatures have increased, the problem has worsened considerably. For about the past month, the vehicle loses power and dies immediately after …
NHTSA complaint 11745618, quoted in part. Filed by an owner and not verified by NHTSA or by us.
ELECTRICAL SYSTEM
The vehicle’s 12-volt electrical system repeatedly loses power within about 1 hour of sitting. The car becomes completely unresponsive (cannot unlock or start) and requires use of the built-in 12V battery reset button to restore power. This occurs frequently and makes the vehicle unreliable and potentially unsafe, as the car may become inoperable without warning. This appears to be an electrical system defect or parasitic power drain. The issue has been ongoing.
NHTSA complaint 11739503. Filed by an owner and not verified by NHTSA or by us.
ENGINE AND ENGINE COOLING
See attached document for complaint.
NHTSA complaint 11730136. Filed by an owner and not verified by NHTSA or by us.
If this is your car and a dealer keeps failing to fix it, your state's
lemon law may require the manufacturer to replace it or buy it back. How
many repair attempts it takes, and how long you have to file, is set by
the state you bought in and by nothing on this page.
Complaints: NHTSA's ODI
complaint file, published October 2, 2026. One
complaint is one ODI number, which is how NHTSA counts them.
Recalls: NHTSA's recall
campaign API, no campaign on file for this vehicle.
Investigations: NHTSA's ODI
investigation file, published October 2, 2026.
A complaint is one owner's account and has not been verified by NHTSA or by
us. A vehicle with more complaints is not necessarily worse: models that
sold in larger numbers collect more of them. How this is counted.
G
Compiled and maintained by guarledes Independent developer and analyst