There are 4 owner-reported speed control & cruise complaints for the 2004 Hyundai Sonatain NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
BACKING INTO THE GARAGE, MY FOOT ON BRAKE, THE ENGINE SUDDENLY REVVED TO HIGH RPM, THE CAR SHOT BACKWARDS, PROPELLING A HEAVY RUBBER MAT ON WHICH THE CAR IS NORMALLY PARKED OUT OF THE GARAGE AND INTO THE DRIVEWAY. THE VEHICLE THEN IMPACTED AND CRASHED THROUGH THE REAR GARAGE WALL BEFORE COMING TO A STOP. I MANAGED TO PRY THE GEAR LEVER OUT OF REVERSE, HIT DRIVE INSTEAD AND SENT THE CAR, WHEELS STILL SPINNING AND LAYING DOWN RUBBER, FORWARD OUT OF THE GARAGE. ON ITS WAY OUT THE CAR SWIPED ALONG THE RIGHT SIDE THE GARAGE DOOR POST BEFORE FINALLY COMING TO A STOP IN THE DRIVEWAY. FINAL RESULT, SERIOUS DAMAGE TO BOTH THE CAR AND THE GARAGE. FORTUNATELY THIS DID NOT OCCUR IN TRAFFIC OR WITH PEDESTRIANS IN THE AREA. ON-LINE RESEARCH HAS SINCE SHOWN ME THAT THERE HAVE BEEN NUMEROUS OTHER SIMILAR INCIDENTS WHERE HYUNDAI SONATAS HAVE SUDDENLY ACCELERATED ON THEIR OWN. SEE HTTP://WWW.CARPROBLEMZOO.COM/HYUNDAI/SONATA/CAR-ACCELERATES-ON-ITS-OWN-PROBLEMS.PHP. *TR
TL* THE CONTACT OWNS A 2004 HYUNDAI SONATA. THE CONTACT STATED THAT WHILE DRIVING APPROXIMATELY 5 MPH, SHE APPLIED THE BRAKES AND THE VEHICLE SUDDENLY ACCELERATED FORWARD. THE VEHICLE CONTINUED TO ACCELERATE UNTIL CRASHING INTO THE WALL OF A BUILDING. THE AIRBAGS ONLY DEPLOYED ON THE PASSENGER SIDE. THE POLICE WERE NOTIFIED AND A REPORT WAS AVAILABLE. BOTH THE DRIVER AND PASSENEGER SUSTAINED MINOR BRUISING AND WERE TRANSPORTED TO THE HOSPITAL VIA AMBULANCE. THE VEHICLE WAS TOWED TO AN INDEPENDENT MECHANIC AND WAS PENDING AN INVESTIGATION. THE MANUFACTURER WAS NOTIFIED VIA EMAIL AND THE CONTACT HAD YET TO RECEIVE A RESPONSE. THE FAILURE AND CURRENT MILEAGES WERE APPROXIMATELY 30,000.
VEHICLE STALLED ON TWO SEPARATE OCCASIONS WHILE DRIVING 45-50 MPH. VEHICLE WAS TOWED TO THE DEALER, WHO REPLACED THE THROTTLE SENSOR THE FIRST TIME, BUT PROBLEM RECURRED. VEHICLE WAS TOWED BACK TO THE DEALER. CONSUMER HAD A CONCERN OF PICKING THE VEHICLE UP. *AK
AFTER STARTING THE VEHICLE, IT ACCELERATED FORWARD. THE CAUSE WAS NOT DETERMINED. PLEASE PROVIDE MORE INFORMATION. *JB
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 25, 2026