Problems · NHTSA complaints
1999 Hyundai Sonata problems
Owners filed 170 complaints about the 1999 Hyundai Sonata with NHTSA between Aug 1999 and Jul 2015. The most-cited component is structure (71).
Complaints
170
Filed with NHTSA
Crashes
13
Reported by owners
Fires
3
Reported by owners
Injuries
25
People reported injured
Deaths
7
Reported to NHTSA
Complaints by component
One complaint can cite several components
- Structure71
- Air bags36
- Suspension28
- Engine and engine cooling27
- Power train17
- Electrical system11
- Steering8
- Service brakes, hydraulic6
- Tires6
- Seat belts6
- Visibility4
- Vehicle speed control3
- Wheels2
- Exterior lighting2
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.
Data from NHTSA Complaints API · synced Nov 10, 2026NHTSA vehicle page
When complaints were filed
Does it get worse with age? Complaints per calendar year filed
4
17
11
11
12
8
10
7
12
42
13
11
3
2
3
2
2
View as table
| Model year | Complaints filed per calendar year |
|---|---|
| 1999 | 4 |
| 2000 | 17 |
| 2001 | 11 |
| 2002 | 11 |
| 2003 | 12 |
| 2004 | 8 |
| 2005 | 10 |
| 2006 | 7 |
| 2007 | 12 |
| 2008 | 42 |
| 2009 | 13 |
| 2010 | 11 |
| 2011 | 3 |
| 2012 | 2 |
| 2013 | 3 |
| 2014 | 2 |
| 2015 | 2 |
Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.
Top problems in owners’ words
Verbatim from NHTSA complaints, newest first
Structure
71 reports1 crash
“TL* THE CONTACT OWNS A 1999 HYUNDAI SONATA GLS. WHILE MAKING A LEFT TURN AT A TRAFFIC LIGHT, THE FRONT PASSENGER SIDE SUSPENSION SEPARATED FROM THE VEHICLE. THE VEHICLE WAS TOWED TO AN INDEPENDENT MECHANIC. THE VEHICLE WAS INCLUDED IN NHTSA ACTION NUMBER: EA08016 (STRUCTURE, SUSPENSION). THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 150,000.”
Air bags
36 reports11 crashes2 related recalls
“L WAS STOPPED ON TRAFFIC ON HIGH WAY ,AND SOME ONE, HIT ME ON THE BACK ,THE GUY WAS SO FAST PROBLEM MORE THAN 75 MPH ,THAN MY CAR FLOAT 20 FOOT ,AND HIT THE CAR ON MY FRONT AND MY AIR BAGS DID NOT DEPLOY OR OPEN , SO THE QUESTION IS HYUNDAI SONATA 1999 USUALLY HAVE THIS PROBLEM , ???? *TR”
Suspension
28 reports1 related recall
“I WAS DRIVING HOME FROM WORK ON JAN 30TH, 2015 AND THE CAR STARTED PULLING TO THE RIGHT. THE NEXT DAY, SAT THE 31ST, I JACKED UP THE RIGHT FRONT OF THE CAR TO SEE WHY THE CAR STEERED TO THE RIGHT. I FOUND THE LOWER WHEEL ASSEMBLY ATTACHMENT TO THE FRAME HAD COME LOOSE. THAT WAS BECAUSE THE FRAME HAD THREE OF FOUR SIDES RUSTED THRU. THE CONDITION COULD HAVE CAUSED A MORE SEVERE ACCIDENT IF THE ATTACHMENT TO THE FRAME HAD PULLED COMPLETELY APART. I WILL CHECK WITH HYUNDAI TO SEE WHAT THEY CAN DO ABOUT IT. THANKS FOR LISTENING. [XXX] *TR”
Engine and engine cooling
27 reports3 crashes1 fire
“I PURCHASED MY 1999 SONATA FROM A USED CAR DEALER & HAVE HAD NUMEROUS PROBLEMS WITH THE CAR, ITS BEEN A NIGHTMARE, ONE PROBLEM AFTER ANOTHER!!!! THE CRANKSHAFT SENSOR HAD TO BE COMPLETELY REPLACED BECAUSE THE COMPONENT HAD SEVERELY MELTED, ISSUES WITH THE TRANSMISSION, ABS/AIRBAG WARNING LIGHT ON, & HAVE HAD TO CHANGE OUT THE HALF SHAFT ON BOTH DRIVERS/PASSENGER SIDE, NUMEROUS TIRES, BRAKES BUT THE MOST SEVERE OF ALL THE PROBLEMS WHICH PUTS MY SAFETY, MY 12 YR OLD SON & FIANCE'S SAFETY, ALONG WITH FAMILY/FRIEND'S SAFETY AT RISK IS THE COMPLETE CORROSION OF THE SUBFRAME I TOO TO A MECHANIC TODAY & HE TOLD ME TO NOT DRIVE THIS CAR FOR ANYTHING BECAUSE IT WILL RESULT IN AN ACCIDENT WHERE I CAN POTENTIALLY END UP HURTING MYSELF OR OTHER INNOCENT BYSTANDERS BECAUSE HYUNDAI MADE A DEFECTIVE SUBFRAME ESPECIALLY FOR US THAT LIVE & DRIVE IN HAZARDOUS CONDITIONS OF THE WINTRY/ICY ELEMENTS FOR 5+MONTHS OUT OF THE YEAR IN UPSTATE NEW YORK!!! I WILL BE CALLING HYUNDAI'S CUSTOMER ASSISTANCE CTR & FUCCILLO HYUNDAI(LOCAL DEALER)& THE ATTORNEY GENERAL FOR NEW YORK. I CANNOT IMAGINE WHAT COULD'VE HAPPENED IF I DROVE OVER A POT HOLE RESULTING IN MY TIRE(S) FALLING OFF ESPECIALLY…”
Power train
17 reports1 crash
“VEHICLE HAD DEVELOPED A FRONT END ALIGNMENT PROBLEM, AND I SCHEDULED AN ALIGNMENT. THE MORNING BEFORE THE SCHEDULED ALIGNMENT, I WAS PULLING OUT OF MY DRIVEWAY TO GO TO WORK WHEN THE RIGHT INNER CV JOINT DISINTEGRATED. INVESTIGATION REVEALED SEVERE SUBFRAME CORROSION RESULTING IN THE CONTROL ARM MOUNT SEPARATING FROM THE SUBFRAME, CAUSING THE CV JOINT TO FAIL AND THE VEHICLE TO BECOME INOPERABLE. NHTSA AND HYUNDAI ISSUED A RECALL IN 2009, CAMPAIGN ID NUMBER: 09V124000. HOWEVER, THE STATE I RESIDE IN (NEBRASKA) IS NOT LISTED AS A "SALT BELT" STATE AND IS NOT COVERED BY THE RECALL. NEBRASKA DOES INDEED USE SALT ON THE ROADS, AND THE DESCRIPTION OF THE FAULT AND POTENTIAL RESULTS MATCHES EXACTLY WITH THE RUST AND CORROSION ON MY VEHICLE'S SUBFRAME AND THE RESULTS. I BELIEVE IT LIKELY THAT THERE ARE OTHER MOTORISTS IN THE STATE OF NEBRASKA WHO ARE DRIVING THESE VEHICLES WITH THIS HIDDEN AND POTENTIALLY VERY DANGEROUS FAULT. THE HYUNDAI DEALER HAS BEEN UNABLE TO HELP ME SO FAR WITH A FAULT RESOLUTION PER THE RECALL. *TR”
Electrical system
11 reports1 crash2 fires1 related recall
“DT: CONSUMER OWNED A 1999 HYUNDIA SONATA. CONSUMER HAD TAKEN VEHICLE TO THE DEALER BECAUSE IT WAS OVERHEATING. THEY FLUSHED RADIATOR, CLEANED THE INSIDE AND OUTSIDE, AND REPLACED THE COOLANT. ALSO, PUT A NEW DRAINING PLUG IN THE RADIATOR. THE DEALER SAID THAT THERE WAS NOTHING WRONG WITH THE COOLING FAN. THIRTEEN DAYS LATER ON 6-28-05 WHILE VEHICLE WAS PARKED AT A STORE IT CAUGHT ON FIRE. WHEN THE CONSUMER TOOK IT TO THE DEALER, THEY TOLD HIM THAT ALTHOUGH HE WAS NO EXPERT IT WAS THE BATTERY THAT BLUE OUT. THE CONSUMER BELIEVED THAT IT WAS THE COOLING FAN THAT CAUGHT ON FIRE. THE BATTERY WAS STILL PARTIALLY THERE AND THE COOLING FAN MELTED. HE CONTACTED THE MANUFACTURER, THEY TOLD HIM IT WOULD BE UP TO THE DEALER TO DETERMINE WHAT HAPPENED. THE CONSUMER SAID THAT HE COULD NOT EVEN GET A FIRE MARSHAL TO INSPECT THE DAMAGE. THE VEHICLE IS CURRENTLY AT THE DEALERSHIP. THE FIREMEN THAT CAME TO PUT FIRE OUT DID MAKE A REPORT. TO THE BEST OF THE CONSUMER'S KNOWLEDGE THERE WAS NO DAMAGE TO ANY OTHER VEHICLE. *AK *TT”
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 10, 2026
Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.