Hyundai Sonata warning lights comes on

Filed Nov 2, 2026 · Driver assistance, Electrical · UT

My 2020 Hyundai Sonata has a recurring electronic system malfunction that causes multiple dashboard warning lights to illuminate, including the Forward Collision-Avoidance Assist System warning. When this occurs, the vehicle can suddenly lose the ability to accelerate. Most recently, this happened while driving in rainy conditions, creating a serious safety hazard. The vehicle has undergone multiple unsuccessful repairs at Hyundai dealerships, including an extended four-week repair involving Hyundai's technical specialists in 2025. The same problem has now returned, and I am concerned about the vehicle's safety and reliability.

Filed Oct 24, 2026 · Electrical, Lights · IN

Was driving with the wife on the highway and all of the lights and the dashboard turned off for about 3 seconds then came back on When the lights did come back on the seat belt light was illluminated then went out again We were safe but scary going 60 mph then all of a sudden total darkness

Filed Jul 15, 2026 · Engine · VA

As I was merging onto the interstate I put my foot on the gas pedal to give it a little more gas then usual to get pulled out and all of a sudden all the lights on the dash board illuminated and it slowly lost all power I was able to move it out of the road ... There was no loud ,knocking or ticking noises prior to this happening there was no type of any kind of warning .. my car is the push start button so after the car died completely I hit the push button and all the lights on the dash came on the radio worked and everything else seemed to be working it was when I went to put my foot on the brake to start it it would do nothing it would not start at all .. I was still able to put it in neutral even after the incident happened . I had it towed t Hyundai of Bristol to have it inspected well they did verifi that the engine was locked up but failed to give me any information on the test they ran or how they keep it was locked up and what locked it up so then they have my car over a week and they tell me I need a new engine but then contact me to tell ke that HMA refused to replace the engine on warranty and I had the campaign 953 completed the knox sensor thing before my car broke down so then I had to pay for towing once again out of my pocket to go pick the car from their dealership so when I got there to get my car the service was not that great and my car was in a mess very uncalled for the battery to the car was completely dead with that being said we had to use another battery to just get it turned on to even put it in neutral well then fuel started spraying from the fuel line , the engine cover was left off right along with engine mount was taken off and they even took the belt off there were bolts laying all over my hood of my car and I'm pretty sure we lost a few transporting the car back ..their service they provided was not business/professional behavior and very disrespectful at that .. returning my car in that condition was very unnecessary

Filed Jun 6, 2026 · Engine · VA

Vehicle experienced sudden loss of motive power while merging onto interstate I accelerated to enter traffic and all dashboard warning lights illuminated at once. Engine shut off immediately with no prior knocking,smoke, or warning. Car coasted to shoulder with complete loss of power steering and power brakes. After incident vehicle will not crank or restart , push -button start activates accessories but engine does not turn over when brake is pressed. Vehicle has Campaign 953\Knock Sensor Detection system update completed on October 14 2020. This failure matches the federal safety agency PE-18-003 and Hyundai TSB 22 -EM-003H for Theta II Engine connecting rod bearing failure.This is a known safety defect causing sudden engine stall at highway speeds .. Dealer inspection is pending Vehicle is currently inoperable...

Filed Jun 5, 2026 · Engine · VA

While merging onto the interstate my vehicle suffered sudden loss of motive power. All dash lights illuminated ,engine shut off instantly with no prior knock or warning.vehicle will not crank or restart.push button start activates accessories only .This matches TSB 22-EM-003H for connecting rod bearing seizure.No crash occured because I was able to coast to shoulder but loss of power steering/brakes at highway speed created a dangerous situation.

Filed Apr 29, 2026 · Brakes, Driver assistance · FL

Automatic Emergency Braking Blind Spot Warning/Blind Spot Detection Forward Collision Warning Antilock Brake System/ABS Lane Departure Warning Lane keeping Assistance I bought this vehicle last month from a dealer and two days later all the warning lights start popping up on the dashboard so I contacted the dealer and told them what was going on with the car they told me to bring it in so that the technician can check to see what’s wrong with it they told me that there’s nothing wrong with the vehicle so I went back home and the same day all the warning lights came back on so now I’m concerned about my daughter’s safety because she use the vehicle to drive to and from school and you never know when the brakes might fail, again I just bought this vehicle a month ago just one month not even a year and it’s having all this problem even though it’s a pre-owned vehicle I shouldn’t have to take it to the shop after one month please help… thank you

Filed Feb 7, 2026 · Driver assistance, Electrical · NY

While driving the dashboard headlights and all safety systems shut off for a brief period and then reset and if driving at night this leaves you completely in the dark till the system resets. All lights exterior and interior all the safety sensors, adaptive cruise control everything shuts off. Anything tied to the electrical system shuts off. The only thing that remains running is the engine.

Filed Feb 1, 2026 · Driver assistance · FL

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.

Filed Dec 17, 2025 · Engine · GA

Hyundai replaced my engine under warranty due to their oil consumption in mid October. About 2 weeks later all warning lights came on and they said need new battery. They put in new battery in November. 15 miles after new battery a burning smell and smoke came from under hood with visible smoke. Took to dealer following day and no smoke. Got car back and next day it’s smoking and burning smell. Got it back to dealership and they had it a while and said no smoke and I got car back. They can’t find a reason and it’s not smoking .About a week later (tonight) burning smell and smoke from under hood at the engine.

Filed Nov 9, 2025 · Electrical · CA

I was sold a 2024 Hyundai Sonata SEL and while driving on the road multiple times the car completely shut off. By this all lights inside AND outside the car turned off (Headlights, interior lights and all) car was still rolling and I pulled over each time as all systems rebooted. It claimed that all seatbelts were off with the warning sign. Had to unbuckle and buckle all seatbelts for this warning to go away. Since the car completely shut off this put other drivers, my passengers, and myself at danger due to visibility. Luckily there was no traffic at the time but this keeps happening and it is worrying me.