FaultScore

2021 Hyundai Sonata driver assist problems

11 of the 180 complaints about the 2021 Hyundai Sonata are about the driver-assist systems — 6% of everything reported for this model year.

F

11

Complaints

2

Crashes

0

Fires

1

Injuries

Exactly what failed

Warnings 4 36.4%
Assist 2 18.2%
Automatic Emergency Braking 2 18.2%
Blind Spot Detection 1 9.1%
Forward Collision Avoidance 1 9.1%
Adaptive Cruise Control 1 9.1%

Driver Assist & Collision Avoidance across every Hyundai Sonata year

2012 11 8.3%
2015 21 15.8%
2016 12 9.0%
2018 14 10.5%
2020 21 15.8%
2021 11 8.3%
2022 15 11.3%
2023 14 10.5%
2024 14 10.5%

What owners said

Filed with NHTSA, in their own words.

Lakeland, FL

LANE DEPARTURE: BLIND SPOT DETECTION

Will be driving the car and suddenly hear a beep. Then the dashboard will flash with the ABS light engine light tire pressure light check Blindspot sensors, forward collision sensors. once all the lights appear on the dashboard, I can no longer accelerate. i’ve cleaned the throttlebody. I’ve replaced the gas pedal and it’s still kicking back the same code it still does it the same identical thing. It’s given out on me three times since December with an infant in the car. We are now in February.

NHTSA complaint #11714874 — an unverified report by a vehicle owner.

Lakeland, FL

FORWARD COLLISION AVOIDANCE: WARNINGS

Will be driving the car and suddenly hear a beep. Then the dashboard will flash with the ABS light engine light tire pressure light check Blindspot sensors, forward collision sensors. once all the lights appear on the dashboard, I can no longer accelerate. i’ve cleaned the throttlebody. I’ve replaced the gas pedal and it’s still kicking back the same code it still does it the same identical thing. It’s given out on me three times since December with an infant in the car. We are now in February.

NHTSA complaint #11714874 — an unverified report by a vehicle owner.

Deatsville, AL

LANE DEPARTURE: ASSIST

Engine makes rattling and knocking noises. Transmission hesitates and jerks Suspension front struts and rear shocks are bad. Possible the isolators. Having horrible back pain when riding in car. Starter intermittently doesn't work Lane keep assistance goes over small bump in road will make car drive in opposite lane into on coming traffic. Took car to Tameron hyundai in Birmingham on the 29th of December 2025. Told them everything thats going on with the car. They did nothing about any of the issues. Car has 55,000 miles on it as that is when all problems have incurred. 60000 mile Warranty expires in February of this year.

NHTSA complaint #11709919 — an unverified report by a vehicle owner.

Woodway, TX Crash 7 injured

FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING

During a front end collision the car did not auto brake and the air bags did not deploy. The car has been totaled and is currently at a dealership for insurance appraisal.

NHTSA complaint #11679381 — an unverified report by a vehicle owner.

Orange, CT

FORWARD COLLISION AVOIDANCE: AUTOMATIC EMERGENCY BRAKING

Was driving in reverse out of garage and ABS brakes were applied like I hit a patch of ice stopping the car. Released when applied pressure to brake. Then while on highway going 60 miles an hour the emergency brake system went on for no reason applying pressure and red light came on the dash with a left facing arrow. System released within a few seconds but scared me and I still have to drive this car on highway.

NHTSA complaint #11639354 — an unverified report by a vehicle owner.

Dothan, AL

FORWARD COLLISION AVOIDANCE

The contact owns a 2021 Hyundai Sonata. The contact stated while driving at an undisclosed speed, the vehicle lost motive power. Additionally, the Forward Collision Avoidance failed to function as intended. The contact stated that the sensor was braking prematurely. The vehicle was taken to the dealer; however, the failure was not duplicated. The contact stated while driving out of the driveway, the vehicle lost motive power. The vehicle failed to restart. The dealer was contacted and made aware of the failure. The vehicle was not diagnosed or repaired by an independent mechanic or the dealer. The manufacturer was not made aware of the failure. The failure mileage was unknown.

NHTSA complaint #11615411 — an unverified report by a vehicle owner.

Elkhorn, NE Crash

FORWARD COLLISION AVOIDANCE: WARNINGS

Vehicle in front of me stopped. Six car lengths between us. I applied brakes, nothing, I even put my left foot on top of my right foot. There was plenty of time to stop but brake peddle wouldn’t go down, Felt like it was locked. Automatic Brake Sensor didn’t work either. Still waiting for inspection from manufacturer , 3 weeks. Never had any problems prior to this, After accident my warning came on about front collision failure .

NHTSA complaint #11520558 — an unverified report by a vehicle owner.

Las Vegas, NV

FORWARD COLLISION AVOIDANCE: WARNINGS

My car barely has 11,000 miles and just the other day it had about 20miles left of gas but as I was driving on the road it started to feel and seem like it was about to die on me, Also the front Wipers are not well restrained with the vehicle you can tell by the way it moves when Wipers are on....Also most of the Signals be It if something is in front of me and the signal goes off BUT THERES NOTHING THERE ...ALSO WHEN IM BACKING UP SOMETIMES the car itself will Force stop as if something is in the way ...BUT AGAIN NOTHING IS THERE AT ALL ...IT HAPPENS EVERY FEW DAYS ....I JUST PURCHASED THIS CAR ..AND REALLY THINKING IT WAS WORST MISTAKE W ALL THESE ISSUES ALREADY

NHTSA complaint #11509258 — an unverified report by a vehicle owner.

Astoria, NY

FORWARD COLLISION AVOIDANCE: WARNINGS

I leased a 2021 Sonata, and the Car has been a nightmare. My Car has been serviced by the dealership twice for a steering wheel that will not stop making noises. I am very concerned for my safety in this Car. The Wheel becomes hard to move. Also, last year, the Car was in the shop for four months while the forward collision sign needed to be fixed. The Car stopped twice. I am terrified to drive this car; it only has 9,200 miles.

NHTSA complaint #11496631 — an unverified report by a vehicle owner.

Chandler, AZ

FORWARD COLLISION AVOIDANCE: ADAPTIVE CRUISE CONTROL

Unknown

NHTSA complaint #11474182 — an unverified report by a vehicle owner.

Chandler, AZ

LANE DEPARTURE: ASSIST

Unknown

NHTSA complaint #11474182 — an unverified report by a vehicle owner.

Other 2021 Hyundai Sonata problems

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