There are 2 stored owner reports matching the speed control & cruise leading-label group for the 2004 Kia Optima 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 2 of 2 matching reports.
Open the full vehicle complaint log (all categories)WHILE DRIVING ON A HIGHWAY WITH CRUISE CONTROL ACTIVE, I WAS UNABLE TO TURN OFF THE CRUISE CONTROL WITH THE STEERING WHEEL CONTROL BUTTONS. THE CANCEL AND SET BUTTONS HAD NO EFFECT WHEN PRESSED. THE CAR REMAINED TRAVELING AT THE SET SPEED. TAPPING ON THE BRAKE PEDAL DID CANCEL THE CRUISE CONTROL.
TL*THE CONTACT OWNS A 2004 KIA OPTIMA. THE CONTACT STATED WHILE DRIVING 30 MPH WITH THE BRAKES ENGAGED THE VEHICLE ACCELERATED AND CRASHED INTO SOME TREES. THE VEHICLE WAS DESTROYED. NO ONE WAS INJURED. THE CONTACT DID NOT CALL THE MANUFACTURER. THE CONTACT STATED THAT THE VEHICLE HAD ALWAYS BEEN UNSAFE TO DRIVE. THE FAILURE MILEAGE WAS 40,000.
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.