2009 Hyundai Sonata Electrical Problems

Passenger seat belt doesn’t click in. Miss fire Poor acceleration Exhaust leak Power lost Mechanic can’t find the problem Check engine light on

NHTSA ID

11715187

Incident

Feb 1, 2026

Brakes seize up while driving and then cannot move the vehicle. This causes a dangerous situation while driving and then breaks lock up and cannot move car even though vehicle is on and then stopped for a stop light. Car must then be turned off and sit for about 30 minutes so it can unseize and when that happens, you can then resume driving and then check engine light comes on. Brake lights were staying on even when vehicle is shut completely off. ABS and ESC lights stay on consistently and never turn off. Vehicle brake switch was replaced at Carolina Hyundai of high point, NC. So break lights have been repaired. They had to order the stop switch lamp replacement for recall as it was never done and will be fixed in next week. 3 door handles fell off and cannot open the rear driver side door at all. Window electric system won’t let windows go up and down and had to make a latch pull string to open driver door. Passenger door will not open at all and no handle and is a dangerous situation. Break switch not being replaced would have cause an electrical fire and is a complete dangerous vehicle even after being inspected less than a week ago

NHTSA ID

11709161

Incident

Dec 1, 2025

Oil Leak on Alternator Engine leaking oil from the front cylinder bank’s valve cover or from the valve cover’s gasket onto the alternator. An unknown amount of oil damaged the alternator resulting in illumination of the charging system warning lamp and disablement of the charging system. If the vehicle is continually driven with a disabled charging system, the engine can shut off, increasing the risk of a crash.

NHTSA ID

11684677

Incident

Aug 23, 2025

Engine leaking oil from the front cylinder bank’s valve cover or leaking from the valve cover’s gasket onto the alternator. A sufficient amount of oil could damage the alternator resulting in illumination of the charging system warning lamp and disablement of the charging system. If the vehicle is continually driven with a disabled charging system, the engine can shut off, increasing the risk of a crash.

NHTSA ID

11684675

Incident

Sep 18, 2019

The contact owns a 2009 Hyundai Sonata. The contact stated that while her daughter was driving 60 MPH, the vehicle lost motive power. The contact was able to pull to the shoulder of the roadway, where the vehicle failed to restart. After calling AAA, the technician determined the vehicle had run out of gasoline however, the instrument panel was reading a half tank. No warning lights were illuminated. The vehicle was towed to the dealer, who diagnosed a failure with the instrument panel. The vehicle was not repaired. The manufacturer was notified of the failure but offered no assistance. The failure mileage was 184,500.

NHTSA ID

11543818

Incident

Jun 30, 2023

Mileage

184,500 mi

I see that the manufacturer has an "Open Service Campaign" on their Sonata's shark fins. I've taken mine to the local dealership and they want a min. $700 to replace the shark fin. It just came off somewhere (a couple of years ago) and, now, my car has to be jumped off if I let it sit more than two days. I have had it inspected by the dealer and an individual garage. No one would tell me what was draining my battery. I am a senior citizen and fear I will get stranded on the road somewhere. The missing fin lets water into my car, soaking the carpets, etc. Finally, it was suggested that the car cover I keep on it touches the exposed fin components and that's what was draining my battery. It seems that the manufacturer was aware enough of this faulty part to want to prevent complaints by voluntarily replacing problematic parts (thus the service campaign). And, there are a lot of videos on YouTube from DIY folks who've suffered through replacing the shark fins (many different models) themselves. It seems, however, the manufacturer only notified dealers with said "open service campaign," not the public, as in a proper Recall process. That way, they get to make more money off the public when the part falls off? Please advise how one might get the dealers to do the right thing. Thank you.

NHTSA ID

11533647

Incident

Jul 20, 2023

Valve cover gasket leaks and oil leaks on to the alternator which can cause the alternator to fail and the battery to not maintain a charge and the car can stall and then not start. This is the same exact problem problem that is in your recall on 2007-2012 Veracruz Recall number 20V705000 & 14V415000 And 2007-2009 Santa Fe vehicles have the same issue and Service Campaign 936 SB-10058931-4495 (TSB# 15-01-031).

NHTSA ID

11513832

Incident

Nov 1, 2022

We purchased this vehicle used 9/2022. A week later it began to jump upon accelerating and slowing down. We took it in and they said it was the power train control module and our warranty would not cover it. So it would cost us around $1600. We can’t afford that. We have only driven it a few times since. We were parked in front of a curb and the car accelerated us into a curb. Now, the ESC OFF, ABS, and engine light are illuminated. This is not a. It also wear and tear issues, as I’ve seen many others posting similar experiences. Our car is an ‘09 with almost 90,000 miles on it.

NHTSA ID

11472208

Incident

Sep 30, 2021

All car systems flashed and car went completely dead. Nothing worked. First time it happened mechanic said alternator and battery had to be changed. A year and a half later exact same thing happened and again new mechanic says the alternator needs to be changed. BIG SAFETY ISUUE AS CAR DIED IN THE MIDDLE OF HIGHWAY WITH CARS GOING ALL AROUND ME TRYING TO AVOID ME. This is Second time the alternator has to be replaced with only 2000 miles on the car after the alternator was replaced the first time.

NHTSA ID

11418571

Incident

May 24, 2021

WAS DRIVING ON ACCESS ROAD AND THE ESC OFF LIGHT CAME ON AND THE CAR STARTED TO STALL- UNABLE TO ACCELERATE. HAD TO PULL TO SIDE OF THE ROAD ON WURZBACH PARKWAY. TOOK IT TO SHOP AND HAD CAM SHAFT, CRANKSHAFT SENSORS REMOVED AND REPLACED. HAD $700 OF OTHER WORK DONE AND CAR WORKED GREAT FOR 2 WEEKS. UNFORTUNATELY TODAY WHILE DRIVING HOME FROM ESC OFF LIGHT CAME ON AND CAR WAS UNABLE TO ACCELERATE. LUCKILY I GOT TO SAFETY BUT COULD'VE BEEN KILLED IF I WASN'T SO LUCKY... PRETTY RIDICULOUS PROBLEM TO HAVE ESPECIALLY AS SO MANY PEOPLE ARE REPORTING THE SAME PROBLEM...

NHTSA ID

11364712

Incident

Oct 16, 2020

Mileage

152,000 mi

CAR WON'T START, NOT EVEN MAKING SOUND OF IGNITION. THIS HAPPENED 3-4 TIMES AND TODAY ITS TOTALLY SHUT OFF. BATTERY LOOKS GOOD AND RADIO , LIGHTS AND ALL WORKING FINE BUT CAR NOT STARTING AT ALL. I READ ONLINE AND LOOKS LIKE THIS IS COMMON PROBLEM FOR ALL HYUNDAI SONATA 2008-2011 CARS.

NHTSA ID

11302671

Incident

Jan 28, 2020

Mileage

145,000 mi

CHECK ENGINE LIGHT IS ON. HECU INTERNAL FAILURE. ACTIVE DTC PRESENT: C1237 PRIMARY PRESSURE SENSOR SIGNAL. SENSOR FAILURE INSIDE THE ABS CONTROL CYCLE. VALUES AT PRESSURE SENSOR CHANGED FROM 0.3 BAR TO 78.0 BAR; NO CHANGE IN SUPPLY VOLTAGE. SUPPLY VOLTAGE CONSTANTLY AT 14V. HYUNDAI HAS MENTIONED THAT THERE ARE NO ACTIVE RECALLS AND THAT THIS PART IS LIFE THREATENING IF IT FAILS - BUT SINCE THE WARRANTY HAS EXPIRED THEY ARE SHYING AWAY. ONLINE THERE ARE SEVERAL KNOWN ISSUES WITH HYNDAI AND HECU. SPECIALLY FOR MODELS BEFORE 2009. ITS HARD TO BELIEVE THAT HYUNDAI IS NOT AWARE OF THIS PROBLEM AND SEEMS LIKE THEY ARE AVOIDING THEIR RESPONSIBILITY AND PLAYING WITH HUMAN LIFE. WOULD APPRECIATE IF THE GOVERNMENT CAN DO SOMETHING.

NHTSA ID

11301374

Incident

Jan 19, 2020

Mileage

96,500 mi

TL* THE CONTACT OWNS A 2009 HYUNDAI SONATA. THE CONTACT STATED THAT THE ELECTRONIC STABILITY CONTROL INDICATOR ILLUMINATED WHILE DRIVING 60 MPH. ALSO, THE VEHICLE JERKED AND STALLED, BUT WAS ABLE TO RESTART. ADDITIONALLY, THE ACCELERATOR PEDAL FAILED TO RESPOND WHEN IT WAS DEPRESSED. THE VEHICLE WAS TAKEN TO SEVERAL INDEPENDENT MECHANICS WHO REFERRED THE CONTACT TO HERITAGE HYUNDAI TOWSON (801 YORK RD, TOWSON, MD, 877-387-5495) WHERE IT WAS DIAGNOSED THAT THE CRANK POSITION SENSOR NEEDED TO BE REPLACED; HOWEVER, THE FAILURE RECURRED. THE MANUFACTURER WAS NOT CONTACTED. THE FAILURE MILEAGE WAS 113,000.

NHTSA ID

11231017

Incident

Jun 14, 2019

Mileage

113,000 mi

THE ALARM WILL SOUND RANDOMLY WHILE DRIVING OR PARKED. WE ARE NOT SURE WHAT IS GOING ON. IT HAPPENS DOZENS OF TIMES A DAY AND ALARMS MY TEENAGE DRIVER. THE BUTTON IS NOT PUSHED, NOTHING IS TOUCHING THE CAR. JUST RANDOM. WE WANT THIS FIXED BECAUSE IT IS A SAFETY CONCERN, ESPECIALLY WHEN SHE IS DRIVING AND THE ALARM GOES OFF FOR NO REASON.

NHTSA ID

11170389

Incident

Jan 1, 2019

Mileage

100,000 mi

WHILE DRIVING THE ESC AND CHECK ENGINE LIGHT COMES THEN IT WILL ONLY LET ME 'COAST' ABOUT 5MPH.

NHTSA ID

11111155

Incident

Jul 6, 2018

Mileage

61,000 mi

TAKATA RECALL. I WAS TOLD THAT THE ELECTRICAL MODULE IS DEFECTIVE BY AUTOZONE,. WE WERE DRIVING DOWN THE HIGHWAY WHEN ALL OF A SUDDEN THE ENGINE LIGHT CAME ON. WE PULLED OVER TO CHECK THE USUAL STUFF LIKE OIL AND ANTIFREEZE AND OTHER FLUIDS. BUT ALL OF THEM WERE OK. WE TRIED TO LEAVE AGAIN WITH NO SUCCESS. WE HAD NO POWER. THE ENGINE WOULD TURN OVER BUT WHEN WE TRIED TO PRESS THE GAS NOTHING WOULD GO. SO WE STOPPED THE CAR WAITED FOR A WHILE AND THEN THE CAR STARTED. WE COUNTINUED OUR TRIP CAREFULLY, BUT THE CHECK ENGINE LIGHT WAS STILL ON. AFTER WE ARRIVED TO OUR DESTINATION I WENT TO AUTOZONE TO CHECK THE PROBLEM. THEY SAID THE ELETRICAL AND CPU MODULES ARE DAMAGED. THAT OF COURSE HAS ME A LITTLE WORRIED. WE HAVE ONLY HAD THE CAR FOR A YEAR SO IT COULDNT BE FOR THAT REASON.

NHTSA ID

11055849

Incident

Dec 19, 2017

Mileage

99,000 mi

TL* THE CONTACT OWNS A 2009 HYUNDAI SONATA. WHILE THE VEHICLE WAS STATIONARY, THE STEERING WHEEL AND THE IGNITION SWITCH SEIZED WITHOUT WARNING. THE VEHICLE WAS TOWED TO TYSINGER HYUNDAI IN HAMPTON, VIRGINIA TO BE REPAIRED, BUT THE DEALER COULD NOT FIND THE CAUSE OF THE FAILURE. IN ADDITION, THE DEALER STATED THAT A LOCKSMITH WOULD NEED TO UNLOCK THE IGNITION. THE MANUFACTURER WAS MADE AWARE OF THE ISSUE. THE FAILURE MILEAGE WAS APPROXIMATELY 80,248. UPDATED 10/18/17*LJ *TR

NHTSA ID

11016242

Incident

Aug 17, 2017

Mileage

80,248 mi

THIS IS MY SECOND OFFICIAL COMPLAINT ABOUT THIS. I DROVE THROUGH A LARGE PUDDLE AND THE BATTERY LIGHT CAME ON, THE CAR SLOWED DOWN BUT RECOVERED AFTER THE LIGHT WENT OFF. I HAVE LOOKED AROUND AND MANY HYUNDAI CUSTOMERS, WITH DIFFERENT MODELS AND YEARS COMPLAIN OF THE SAME ISSUE. IS ANYTHING BEING DONE ABOUT THIS YET? OR DO DRIVERS HAVE TO DIE FIRST. PLEASE HELP US. -[XXX]PREVIOUS COMPLAINT # 10954232 INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).'*JB

NHTSA ID

10981244

Incident

Apr 25, 2017

Mileage

85,000 mi

TL* THE CONTACT WAS REPAIRING A 2009 HYUNDAI SONATA. WHILE DRIVING VARIOUS SPEEDS, THE IGNITION WOULD INADVERTENTLY RESTART WHILE THE VEHICLE WAS IN MOTION. THE STARTER MOTOR COULD BE HEARD RE-ENGAGING. THE DRIVER WAS ABLE TO DRIFT TO THE SIDE OF THE ROAD, SHIFTED THE GEAR INTO NEUTRAL, AND RESTARTED THE VEHICLE CORRECTLY. AFTER SEVERAL MINUTES OF NORMAL OPERATION THE FAILURE RECURRED. THE VEHICLE WAS TAKEN TO AN INDEPENDENT MECHANIC AND THEN TO A DEALER WHERE IT WAS DIAGNOSED THAT A NEW KEY CYLINDER AND IGNITION SWITCH NEEDED TO BE INSTALLED. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOTIFIED. THE FAILURE MILEAGE WAS 48,000. UPDATED 04/12/17 *LJ *AS

NHTSA ID

10943923

Incident

Nov 20, 2016

Mileage

48,000 mi

SEVERAL DRIVER SIDE DOOR ELECTRONICS MALFUNCTIONS. LOCK BUTTON DOES NOT RESPOND WHEN TRYING TO LOCK DOORS. GAS CAP OPENER DOES NOT WORK. I HAVE TO MANUALLY OPEN MY GAS CAP THROUGH THE TRUNK. WINDOW AUTO CLOSE BUTTON NOT RESPONSIVE MOST OF THE TIME.

NHTSA ID

10929900

Incident

Jul 16, 2012

Mileage

75,000 mi

CHECK ENGINE LIGHT CODE READS INTAKE VALVE CIRCUIT HAS LOW VOLTAGE. NOTICED REDUCED GAS MILEAGE ECONOMY AND POOR ENGINE PERFORMANCE.

NHTSA ID

10929895

Incident

Dec 4, 2016

Mileage

146,000 mi

FRONT ENGINE VALVE COVER GASKET LEAKED OIL ONTO ALTERNATOR CAUSING IT TO BECOME DAMAGED, WHICH LED TO POOR TRANSMISSION SHIFTING AND THEN COMPLETE LOSS OF ALL ELECTRICAL POWER.

NHTSA ID

10929891

Incident

Nov 24, 2016

Mileage

146,000 mi

FRONT ENGINE VALVE COVER GASKET LEAKED OIL ONTO ALTERNATOR CAUSING IT TO BECOME DAMAGED, WHICH LED TO POOR TRANSMISSION SHIFTING AND THEN COMPLETE LOSS OF ALL ELECTRICAL POWER.

NHTSA ID

10929890

Incident

Jun 26, 2014

Mileage

145,000 mi

CAR STARTED AS USUAL AND I WAS DRIVING ON A CITY STREET GETTING READY TO GET ON THE HIGHWAY. ALL OF A SUDDEN THE CAR WOULD ONLY GO ABOUT 20 MPH AND REACH 1000 RPM. IT DIED SHORTLY THEREAFTER ON THE HIGHWAY FRONTAGE ROAD. ALL OF THE LIGHTS FOR ABS, BRAKES, CHECK ENGINE ETC. CAME ON BUT THE EMERGENCY FLASHERS WOULD NOT WORK SO I HAD TO KEEP PUMPING THE BRAKES SO NOBODY WOULD RUN INTO THE BACK END OF MY CAR. IT WOULD NOT RESTART SO I HAD TO HAVE IT TOWED TO THE DEALER. DEALER STATED VALVE COVER GASKET HAD LEAKED OIL ONTO THE ALTERNATOR AND RUINED IT. THAT IN TURN RUINED THE BATTERY. CAR WAS REPAIRED FOR $1400 INCLUDING THE TOW AND A RENTAL CAR. AFTER LOOKING AT HYUNDAI RECALLS, I NOTICED THE ONE FOR THE 2009 VERA CRUZ (NHTSA# 14V415000) IN WHICH 61,122 UNITS WERE RECALLED FOR THIS SAME PROBLEM. IN RESEARCHING THE AFFECTED VALVE COVER GASKET, I FOUND THE SAME ONE WAS USED ON MY 3.3L ENGINE THAT WAS LISTED AS DEFECTIVE ON THE 3.8L VERA CRUZ ENGINE. IF THAT PART WAS DEFECTIVE ON THAT VEHICLE, WHY WAS THE SCOPE OF THIS RECALL NOT EXTENDED TO COVER ALL POSSIBLE VEHICLES THAT COULD BE AFFECTED? I WOULD LIKE THE COST OF REPAIRS REFUNDED TO ME SINCE HYUNDAI OBVIOUSLY KNEW THIS PART WAS DEFECTIVE BUT DIDN'T ISSUE A RECALL TO COVER ALL AFFECTED VEHICLES. *TR

NHTSA ID

10920457

Incident

Oct 27, 2016

Mileage

143,000 mi

ON 10/08/2009 MY 209 HYUNDAI SONATA WENT INTO AN UNINTENDED ACCELERATION. AS SOON AS I PUT THE CAR INTO DRIVE IT BEGAN TO ACCELERATE. THE BRAKES DID NOT WORK AND I WAS ABLE TO SHIFT INTO NEUTRAL. I WAS ON A NARROW DIRT ROAD WITH LITTLE LIMITED OPTIONS AS TO WHERE TO STEER THE VEHICLE. I MISSED A BOULDER, GARAGE, AND TREE BEFORE HITTING THE SIDE OF A HOUSE. THE AMBULANCE WAS CALLED AND I WAS TRANSPORTED TO THE LOCAL EMERGENCY ROOM. I HAD A CONCUSSION, FRACTURED KNEE ALONG WITH A NUMBER OF BRUISES AND ABRASIONS. THE EMTS TOLD ME HOW LUCKY IF WAS SINCE THE AIR BAGS DID NOT DEPLOY.. AN INTERNET SEARCH, INCLUDING YOUR WEBSITE, NOTES THESE PROBLEMS GOING BACK SEVERAL YEARS. TOYOTA HAD THE SAME PROBLEM AND DID A RECALL. MY INJURIES WILL EXCEED THE LIMIT OF MY INSURANCE AND I WILL HAVE TO PURCHASE A CAR. I KNOW HOW LUCKY I WAS TO WALK AWAY. I AM SURE OTHERS HAD MORE SERIOUS INJURIES AND HIGHER EXPENSES. WHAT DOES IT TAKE TO FORCE HYUNDAI TO DO THE RIGHT THING?

NHTSA ID

10916130

Incident

Oct 8, 2016