2021 HYUNDAI SONATA HYBRID

0 recalls — 66 complaints — 43 TSBs — 5/5 safety rating

No recalls found for this vehicle.

Complaint Statistics

66 total complaints 3 crashes 6 injuries

Top Reported Components

Component	Complaints
ELECTRICAL SYSTEM	22
ENGINE	20
UNKNOWN OR OTHER	7
FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING	3
FUEL/PROPULSION SYSTEM	3
POWER TRAIN	3
FORWARD COLLISION AVOIDANCE: WARNINGS	1
FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL	1
ENGINE AND ENGINE COOLING:ENGINE:OIL/LUBRICATION:SUMP/TANK:DRAIN PLUG	1
ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL:GAS RECIRCULATION VALVE (EGR VALVE)	1

Incident date: Apr 10, 2025

Owned car since 09/2024 with 64K miles. Battery system (12V/hybrid system) has shut down and died 47 times since 04/2025 - no shut downs before then. Car with ~69K miles at that time. Dealer had car six weeks (05/17 to 07/05/2025) and it died “a number” of times and report that Hyundai claims t... Read more

Incident date: Jul 19, 2025

This is on my 2021 Hyundai Sonata Hybrid Limited - for the 7th time the vehicle has been completely dead and unresponsive. I have had to gain entry to the vehicle using the manual key and press the "jump" button to get the vehicle to start. The Hyundai dealership ran a bunch of battery updates to th... Read more

Incident date: Jul 9, 2024

What component or system failed or malfunctioned, and is it available for inspection upon request? RANDOM TOTAL ELECTRICAL FAILURE (DOORS WON'T UNLOCK, CAR UNRESPONSIVE) How was your safety or the safety of others put at risk? DIFFICULT TO GAIN MANUAL ENTRY TO CAR, PARTICULARLY IN DARK SITUATIONS Ha... Read more

Incident date: Jun 29, 2025

Every day the car is dead, have to take the manual key out pop door cover off unlock car manually push the 12v reset button and hold fob to start/stop button for car to work again. Happens daily.

Incident date: May 27, 2025

12v battery dying randomly

Incident date: Apr 15, 2025

Air flow check engine light alerted and source was faulty fuel injector which required replacement of 4 fuel injectors.

Incident date: Feb 12, 2025

Overheated engine alarm came on while I was on the freeway on a rainy day. Vehicle was towed to Hyundai dealership in which service technician found that the part preventing water from leaking into the muffler was broken. Hyundai dealership has ordered replacement part but it is on backorder. The... Read more

Incident date: Jan 22, 2025

Coolant system leaks in to the engine or exhaust system, which is evident in white smoke exhaust and coolant level dropping. In my situation, I required an entire container of coolant to perform a daily commute, and the reservoir was empty by the time I made it to the dealership. Car is rendered und... Read more

Incident date: Jan 19, 2025

My 2021 Hyundai Sonata Hybrid seems to be leaking coolant into the exhaust system. Various reports online indicate that this is a consistent issue with 2020-2022 Hyundai Sonata Hybrid models. A lot of the reports indicate that owners have tried getting theirs cars repaired for the same issue I have ... Read more

Incident date: Jan 19, 2025

Incident date: Jan 13, 2025

EHRS Coolant Leak- problem started in [XXX] when engine overheated. The weather in Michigan in inclement and being stranded in the intense cold can lead to loss of life. I had it towed to a Hyundai dealership that was unable to find the problem and in attempting to "find a leak" used the incorrect ... Read more

Incident date: Dec 5, 2024

the car randomly goes into dead or limp mode and unable to start. need to jump start it to come alive. No codes shown once its jumstarted. it has happened at random on several occasions.

Incident date: Sep 28, 2024

When the vehicle is turned off the 12v Lithium battery will die. This is a intermittent occurrence that has happened approximately 7 times since [XXX]. Today is December 12, 2024. The car is currently at All Start Hyundai dealership in Pittsburg, CA. This dealership initially denied the car had a pr... Read more

Incident date: Nov 5, 2024

On three separate occasions, while going very fast (60-78 mph), the automatic emergency braking system turns on. The warning lights flash and there is some type of warning noise. I don't even know if it starts to break because it scares me so much, I just press the gas. It turns off within a couple ... Read more

Incident date: Nov 5, 2024

Incident date: Sep 16, 2024

The BMS module within my cars hybrid system failed causing a parasitic drain on the hybrid battery. The dealership where the work was performed would have to be contacted for pictures. The hybrid battery system swole to a dangerously inflated level and did not produce any codes for an OBD reader t... Read more

Incident date: Sep 23, 2024

The contact owns a 2021 Hyundai Sonata Hybrid. The contact stated that the key fob was inoperable and after using the key to manually open the door. The contact stated that the vehicle failed to start while pressing the START/STOP button. The vehicle was towed to the local dealer, but the cause of t... Read more

Incident date: Aug 27, 2024

On three separate occasions over the last two months, while driving, an alert comes on that says check hybrid system then the vehicle powers off. When this happens, you lose the ability to accelerate break steer, and I have been lucky each of those three times and that I was in a situation where the... Read more

Incident date: Aug 27, 2024

Incident date: Feb 20, 2023

Coolant leak acting like blown head gasket. Coolant was leaking into the exhaust system. Defective EHRS system

Incident date: Aug 12, 2024

The car randomly loses power and stalls on the expressway and it states that something is wrong with the hybrid system

Incident date: Mar 15, 2024

The vehicle, after parking, is nonresponsive to the key fob, nor will it start. This can happen at anytime and anywhere. Dealer said "It is possible the integrated 12v battery into the hybrid battery may be faulty. No codes or tests can confirm the issue. The dealer said the key fobs tested ok." My ... Read more

Incident date: Mar 15, 2024

Incident date: Apr 4, 2024

My battery has died twice, so dead that I can’t even unlock to car with the remote. The first time I had it jumped and took it to the dealership where they were unable to find anything wrong with it and they told me if it happened again to have it towed in so they could diagnose it while the batte... Read more

Incident date: Jun 28, 2024

Randomly the car will get a message when driving starting “ Check Hybrid system. Turn engine Off” and the car isn’t able to accelerate when this happens. When you cut the engine off the car is unable to start again until it is jumped. I’ve confirmed the battery isn’t the issue however some... Read more

Incident date: Feb 20, 2024

215/55R17 94V BSW. . Contacted Michelin about two (2) of the four (4) tires DO Not have the date of manufacture on side wall. These tires are direction specific. They should known that. Maybe the date of manufacture is on the inside wall but they should known the the tire is DIRECTIONAL and be ... Read more

Incident date: Jun 16, 2024

Driving 70 mph, warning lights and alarms "Hybrid System Failure" "Vehicle shutting down" and then it does. No lights, no hazards, no power. Push button battery restart starts it again with no visible issues. Driving 30 mph, warning lights and alarms "Hybrid System Failure" "Vehicle shutting down" ... Read more

Incident date: Jun 11, 2024

Driving on the freeway when we got a notice on the dash that we needed to pull over and the vehicle shut down due to a fuse,/battery issue.

Incident date: Jun 3, 2024

My car will power off randomly, or will seem as though there is no power. I have to revert back to the manual key to enter the vehicle and hit the 12vlt reset to power it back on. This happened at least 3 times. Once while operating the vehicle, and twice while the vehicle was left parked. This is n... Read more

Incident date: Jun 3, 2024

Incident date: May 21, 2024

Integrated 12v battery in hybrid system keep draining out. I have to manually open the car and reset it every time in order to be able to drive.

Incident date: Mar 24, 2024

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. T... Read more

Incident date: Mar 24, 2024

Incident date: Feb 1, 2023

the car keeps randomly dying (not during driving "yet") it happens at least once or twice a week of where i go to ride my car and it is completely dead, i have to unlock the door using the key fob manually and push the "Reset 12v battery button" inside the car. i have tried to have Hyundai service... Read more

Incident date: Mar 6, 2024

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 h... Read more

Incident date: Mar 6, 2024

Incident date: Mar 5, 2024

Integrated 12V battery dies with no warning and requires manual keyed process to get in to the vehicle. Once inside, the battery reset button needs to be pressed to have the solar battery start the vehicles electric system. After a few minutes the engine takes over to start charging the battery. ... Read more

Incident date: Jan 9, 2024

Initially had loss of cabin heat. Later, vehicle randomly overheated. Repair shop replaced EGR due to finding confidant buildup of water/coolant mix. Within one week, problem returned. Dealer notified me that while replacing another part they found a TSB for coolant leakage into exhaust that was... Read more

Incident date: Dec 20, 2023

Hyundai 2021 Sonata Hybrid. Blown head gasket. Reported 1,000 miles after warranty expired. Car was in the shop for Hybrid battery issues. Repair completed. 2 weeks later smoke coming from the exhaust. Hyundai says blown head gasket - will not honor warranty as I was just a few thousand miles ... Read more

Incident date: Dec 26, 2023

Antifreeze is coming out of the exhaust. Heater is only blowing cold air. Repair shop said it is a common problem with the Hyundai hybrids. Was told I had to take it back to the dealership. The y repair shop said this is very common and is wondering why a recall has not been issued by the NTHSB.... Read more

Incident date: Dec 26, 2023

Incident date: Sep 30, 2022

The vehicle has been turning completely off after use for over a year now. At first it would happen every now and then at the beginning and all you'd have to do was restart the car manually. Now every time the car is turned off it needs to be restarted manually now. The car will also shut itself o... Read more

Incident date: Dec 18, 2023

My vehicle's heat stopped working suddenly. A short while later, I received and overheat warning for the engine. I had to stop repeatedly on the shoulder of the highway to allow the car to cool so I could move it to a safe space at the next exit. The dealer has confirmed that the coolant was leak... Read more

Incident date: Sep 30, 2022

Incident date: Nov 25, 2023

While driving, engine alerted that it was overheating. Pulled over and coolant was very low, so I refilled it and then while driving to my family's garage to use the lift, saw white exhaust smoke. Took it to an independent mechanic, and in the ~10 mile trip there, over a quart of coolant had been bu... Read more

Incident date: Nov 25, 2023

Incident date: Jun 15, 2023

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

Incident date: Jul 10, 2023

My 2021 Sonata Hybrid Limited has been in the shop for over 3 months. At least 4 times while driving on city streets, I'd receive an error stating problem with hybrid system please turn off vehicle. Car would go into limp mode giving me just enough power to pull off to the side of the road (if possi... Read more

Incident date: Jul 10, 2023

Showing 50 of 66 complaints.

NHTSA Safety Ratings — 2021 HYUNDAI SONATA HYBRID

2021 Hyundai Sonata Hybrid 4 DR FWD

Category	Rating
Overall Rating	5 / 5 ★★★★★
Frontal Crash	4 / 5 ★★★★☆
Frontal Crash — Driver	4 / 5 ★★★★☆
Frontal Crash — Passenger	5 / 5 ★★★★★
Side Crash	5 / 5 ★★★★★
Side Crash — Driver	5 / 5 ★★★★★
Side Crash — Passenger	5 / 5 ★★★★★
Rollover	5 / 5 ★★★★★
Rollover Risk	9.7%

Safety Technology

Feature	Status
Electronic Stability Control	Standard
Forward Collision Warning	Standard
Lane Departure Warning	Standard

Source: NHTSA 5-Star Safety Ratings Program. Ratings are based on crash tests conducted by the National Highway Traffic Safety Administration.

EPA Fuel Economy — 2021 HYUNDAI SONATA HYBRID

Trim / Engine	City MPG	Highway MPG	Combined MPG	Fuel Type	Annual Fuel Cost
2.0L 4-cyl, Automatic (AM-S6) (Front-Wheel Drive)	45.0	51.0	47.0	Regular	$1,250

CO2 Emissions: 189.0 g/mile (Large Cars)

Source: U.S. Environmental Protection Agency (EPA). Actual fuel economy may vary based on driving conditions.

Technical Service Bulletins — 2021 HYUNDAI SONATA HYBRID

43 manufacturer communications from 28 unique bulletins. TSBs describe known problems and recommended fixes from the manufacturer.

Most Affected Components

Component	Bulletins
100000 POWER TRAIN	10
060000 ENGINE AND ENGINE COOLING	8
110000 ELECTRICAL SYSTEM	5
010000 STEERING	4
350000 EQUIPMENT	3
355200 EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL	2
130000 VISIBILITY	2
356000 EQUIPMENT ADAPTIVE/MOBILITY	1

130000 VISIBILITY/WIPER (PWS)

This bulletin contains information about the proper removal of the windshield wiper blade protective cover on all models. If the protective cover is not removed correctly, there is a possibility of the rubber insert and rail spring becoming

130000 VISIBILITY

110000 ELECTRICAL SYSTEM

Some vehicles equipped with the AVN 5th Gen Wide system may exhibit a condition where the radio app crashes frequently when entering radio mode and/or displays a message that reads a??Uneven Road Ahead, Drive carefullya?? on the cluster alo

060000 ENGINE AND ENGINE COOLING

This bulletin provides the procedure to update the Hybrid Control Unit (HCU) and Dual Automatic Temperature Control (DATC) software to help improve coolant flow to the Exhaust Heat Recovery System (EHRS).

100000 POWER TRAIN

Certain 2020-2023MY Sonata Hybrid (DN8 HEV) vehicles may exhibit coolant leakage, engine overheating, and white smoke from the exhaust due to an internal leak at the Exhaust Heat Recovery System (EHRS) portion of the center muffler assembly

060000 ENGINE AND ENGINE COOLING

110000 ELECTRICAL SYSTEM

100000 POWER TRAIN

This TSB provides information to diagnose the push button shifter operation.

060000 ENGINE AND ENGINE COOLING

This bulletin provides important checkpoint guidelines when performing engine oil and filter change services.

100000 POWER TRAIN

This bulletin provides information related to the Engine Control Module (ECM) software update and coolant replacement for 2020-2023MY Sonata Hybrid (DN8 HEV) vehicles to improve the coolant filling mode by discharging air bubbles.

061600 ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM)

100000 POWER TRAIN

This TSB provides information to diagnose the push button shifter operation. If you are servicing a vehicle with any symptoms listed below or DTCs (listed on Page 2) , follow the Service Procedure on Page 3. SYMPTOMS: a?? a??Shifter System

103000 POWER TRAIN:AUTOMATIC TRANSMISSION

110000 ELECTRICAL SYSTEM

This Service Information bulletin provides information on how to update the Apple Carplay software from Hyundaia??s Navigation Updates page. The current version of Google Maps has 10 times the data transmission compared to the previous vers

353610 EQUIPMENT:ELECTRICAL:INFOTAINMENT:SOFTWARE

162000 STRUCTURE:BODY

Hyundai applies a Paint Protection Film (PPF) on new vehicles before delivery to dealerships. It provides a barrier between the paint and contaminants, such as rail dust, acid rain, and industrial fallout. In rare cases, the paint can becom

130000 VISIBILITY

This bulletin provides information regarding condensation related to the accumulated moisture in the headlamp, rear combination lamp, daytime running lamp (DRL), or fog lamp. This TSB illustrates the various causes of condensation inside th

100000 POWER TRAIN

If you are servicing an applicable vehicle with a a??Check Enginea?? light on and one or more of the DTC listed below, follow the Service Procedure and replace the valve body internal harness and the input/output speed sensor.

060000 ENGINE AND ENGINE COOLING

Follow the guidelines outlined in this bulletin to inspect and clean or replace certain components of the engine intake system accordingly during engine short block or sub-assembly replacement.

190000 TIRES

Effective June 2, 2008, Federal Motor Vehicle Safety Standard 110 (FMVSS 110) established a threshold for correcting load carrying capacity information indicated on tire placards when vehicle weight has been increased before retail sale

060000 ENGINE AND ENGINE COOLING

If you are servicing an applicable vehicle with a a??Check Enginea?? light on and one or more of the DTC listed below, follow the Service Procedure and replace the related solenoid and harness.

010000 STEERING

Certain vehicles may develop a bearing noise within the Motor Driven Power Steering (MDPS) column worm shaft assembly. If bearing noise is heard, follow the procedure in this bulletin to replace the worm shaft bearing.

010000 STEERING

060000 ENGINE (PWS)

If you are servicing an applicable vehicle with a a??Check Enginea?? light on and one or more of the DTC listed below, follow the Service Procedure and replace the harness with an integrated oil temperature sensor.

355200 EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL

100000 POWER TRAIN

This TSB provides a procedure to diagnose the push button shifter operation. If you are servicing a vehicle with any symptoms or DTC listed below, follow the Service Procedure, Page 2.

010000 STEERING

100000 POWER TRAIN

This TSB provides a procedure to diagnose the push button shifter operation.

100000 POWER TRAIN

If you are servicing an 8-speed front-wheel-drive vehicle with the DTC or symptoms listed below, refer to the Service Procedure to diagnose the condition. i?? DIAGNOSTIC TROUBLE CODES: i?? P070500 - Transmission range sensor circuit malfu

100000 POWER TRAIN

This bulletin describes the procedure to update the Shift Control Unit (SCU) for Shift-by-Wire vehicles (SBW). The update improves the display in the cluster.

350000 EQUIPMENT

This bulletin provides the service procedure for engine connecting rod bearing clearance testing. Perform the procedure outlined in this bulletin to fulfill the Bearing Clearance Test inspection requirements to determine next required steps

060000 ENGINE AND ENGINE COOLING

030000 BRAKES (PWS)

This bulletin provides best practice recommendations when performing brake service procedures.

356000 EQUIPMENT ADAPTIVE/MOBILITY

This bulletin provides best practice recommendations when performing brake service procedures.

350000 EQUIPMENT

This bulletin provides best practice recommendations when performing brake service procedures.

350000 EQUIPMENT

This bulletin provides the inspection procedure and repair guidelines for certain vehicles listed below.

060000 ENGINE AND ENGINE COOLING

This bulletin provides the inspection procedure and repair guidelines for certain vehicles listed below.

355200 EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL

This bulletin describes the procedure to update the radio software to help reduce the disconnection occurrences.

110000 ELECTRICAL SYSTEM

This bulletin describes the procedure to update the radio software to help reduce the disconnection occurrences.

110000 ELECTRICAL SYSTEM

When using Wireless CarPlay, the system may intermittently auto disconnect. When Wireless CarPlay is disconnected, a pop up message a??Phone Not Responding. Please reconnect it and try againa?? will appear on the radio screen. This bulletin

HYUNDAI SONATA HYBRID — All Years Overview

Complete safety history for the HYUNDAI SONATA HYBRID across all model years (2011–2026).

67 Total Recalls

1,129 Total Complaints

0 Investigations

67 Reported Crashes

34 Reported Fires

0 Reported Deaths

HYUNDAI SONATA HYBRID — Year by Year

Compare recalls and complaints across model years. Click any year to see full details.

Year	Recalls	Complaints
2026	8	0	View
2025	0	11	View
2024	0	12	View
2023	0	23	View
2022	0	30	View
2021 (current)	0	66
2020	2	21	View
2019	0	5	View
2018	1	15	View
2017	4	121	View
2016	9	183	View
2015	5	79	View
2014	4	40	View
2013	8	166	View
2012	13	213	View
2011	13	144	View

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ACCENT	64	2,745	View
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