really awful
Crashes / Fires:
1 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
115,333 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2004 Hyundai Sonata engine problems

engine problem

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2004 Hyundai Sonata Owner Comments

problem #3

Sep 232013

Sonata 4-cyl

  • 130,000 miles


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.

- Sierra Madre, CA, USA

problem #2

Mar 052013


  • 85,000 miles
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

- Battle Creek, MI, USA

problem #1

Mar 082013

Sonata 6-cyl

  • 131,000 miles
The right side of the engine cradle broke (due to corrosion); the result of this broke the right front half axle, and detroyed right front tire.

- Portage, MI, USA

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