There are 5 stored owner reports matching the engine leading-label group for the 2004 Hyundai Sonata in our NHTSA-sourced dataset. These are unverified consumer reports and may not reflect confirmed defects.
This group counts stored reports whose component label starts with one of this site's matching prefixes, ignoring case. Each matching report counts once within the group. Components mentioned later in the label or only in the narrative are not searched. How component counts work
Loaded 5 of 5 matching reports.
Open the full vehicle complaint log (all categories)THE CAR STARTED LOSING SPEED AND STALLED A COUPLE OF TIMES. THE CAMSHAFT SENSOR AND CRANKSHAFT SENSORS WERE REPLACED. THE PROBLEM HAPPENED 6 MONTHS LATER. *TR
2004 HYUNDAI SONATA GLS DIES RANDOMLY WHEN STOPPED AT A RED LIGHT OR TURNING AT A LOW RATE OF SPEED, THEN STARTS RIGHT UP AND MAY NOT DO IT AGAIN FOR A MONTH OR A FEW DAYS. CHECK ENGINE LIGHT DOES NOT COME ON AND VEHICLE RUNS GREAT BESIDES DYING IN TRAFFIC WHICH COULD CAUSE A CRASH. *TR
WHILE DRIVING MY 2004 HYUNDAI SONATA AT LOW SPEED, THE ENGINE SUDDENLY DIED. THIS CAUSED ME TO LOSE POWER STEERING AND POWER BRAKES. FORTUNATELY THERE WAS SPACE FOR ME TO PULL TO THE CURB AND NO ONE WAS BEHIND ME. AFTER AN HOUR OR SO OF TRYING THE CAR STARTED UP AND I DROVE IT HOME. THREE DAYS LATER IT HAPPENED AGAIN ON A BUSY STREET AT ABOUT 10 MPH. AGAIN I WAS FORTUNATE AND COULD PULL TO THE CURB. THIS TIME I COULD NOT START IT AND HAD IT TOWED TO A LOCAL REPAIR SHOP. THEY DIAGNOSED IT AS A "DEFECTIVE EVAP. SOLENOID THAT WAS CAUSING ENGINE FLOODING." THIS WAS A VERY SCARY OCCURRENCE--IF IT HAPPENED ON A HIGHWAY IT WOULD BE VERY DIFFICULT TO STEER (DUE TO LOSS OF POWER STEERING) AND MY SUDDEN SLOWING COULD CAUSE REAR-END CRASH. THE OLD PART IS NOT AVAILABLE. *TR
2004 HYNDAI SONATA STALLS ON HIGHWAY. *TR
DT: THE CONTACT EXPERIENCED PROBLEMS WITH STARTING THE VEHICLE ON TWO OCCASIONS. WHEN IT OCCURRED THE FIRST TIME HE ATTEMPTED THREE TIMES BEFORE THE ENGINE TURNED OVER. THE SECOND TIME THE KEY REMAINED IN THE IGNITION FOR FOUR MINUTES BEFORE THE VEHICLE WOULD START. ALSO, THE DEALER STATED THE PROBLEM WAS INTERMITTENT, AND ONLY OCCURRED ONCE. BECAUSE THE DEALER WAS UNABLE TO DUPLICATE THE PROBLEM NO REPAIRS WERE DONE. *AK
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.
NHTSA source checks for this vehicle year
Checks are recorded separately for each dataset, not for the whole page. Dates use UTC. A missing check date does not mean no records exist.
Vehicle import recorded: Apr 28, 2026. This is the stored import date, not confirmation that every source was successfully refreshed.