Huge win for car owners! All TSBs to be made public. The Center for Auto Safety just made the NHTSA (US Government) make public the full text of all TSBs from now on. They are the same organization that has petitioned the NHTSA & filed lawsuits to protect car owners over exploding gas tanks & other major safety issues. Whenever you drive in your car, you are safer thanks in part to a lot of work over the years by this small but very effective consumer advocacy group.

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really awful
Crashes / Fires:
3 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
64,173 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 XG350 engine problems

engine problem

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2004 Hyundai XG350 Owner Comments

problem #9

Dec 232013

XG350 6-cyl

  • 136,000 miles


I was driving and rusted subframe collapsed control arm & right axel broke also power steering belt broke. I was able to get over nearly having an accident. I had my car repaired in 2010 as per recall yet I tried to push for sub frame replacement over repair at that time with no luck. I believe these sub frames that were repaired should be replaced. This is an extremely dangerous situation I could have been killed!

- Bayshore, NY, USA

problem #8

Nov 082013


  • 89,000 miles
I own a 2004 Hyundai xg350L that is having accelerator issues. On several occasions, while stopped / idling, or slowing down, the vehicle will suddenly accelerate. This is while the brake is being applied. I can be setting at a stop light or stop sign with foot on the brake, not the accelerator, ( I do not drive with both feet like some people incorrectly do : ) and suddenly the car will rev up and try and accelerate forward. In other cases, I can be slowing down with brake applied, and again, the vehicle will accelerate forward. I have to really "mash" the brake to prevent the car from accelerating forward. Once I bring the car to a stop, and the car is still trying to accelerate, I will have to put the shifter into neutral, and turn the car off. I can let the car sit for several minutes, restart it, and it will usually be back to normal. Luckily, I have not had any accidents as a result of this issue, as some of the other people who have posted complaints have......yet. On several other occasions, it has been just the opposite..........I will be driving down the road at any given speed, and suddenly the car will just stop accelerating & go to an idle. You can press the gas petal to the floor, and the accelerator will not respond. The car will remain running, but will only idle. I once had to drive approx. 8 miles, in the emergency lane, at an idle speed of about 5-10 mph to reach my destination : ( these where once sporadic occurrences, but now happens on a daily bases. I just recently replaced the throttle position sensor, and this did not fix the problem. I have learned that it could be caused by the "accelerator petal position sensor"; Hyundai pn:35357-3B011. There is obviously a serious issue w/ accelerator problems w/ the XG350, sonata & Santa Fe, that Hyundai needs to address. I have read of cases w/ Hyundai acceleration problems that have caused deaths.

- Nicholasville, KY, USA

problem #7

Jan 112013


  • 106,000 miles
I have a 2004 Hyundai XG350. Many times when I leave the car overnight (or for a few hours) and then start it back again, the gear does not engage when I put it in drive. When I press the accelerator, after a few seconds, the gear engages suddenly and the car lurches forward. The problem persists for the first few minutes while I am driving. So when I am making a turn, again the car has to start from zero, so it wouldn't move for the first few seconds and just jump forward. This can be very risky at times, especially on turns. Once the engine is heated up, there is no problem. I have also found other people facing same issue but not fix for this problem yet. I wish a class action lawsuit could be filed against Hyundai.

- Columbus, OH, USA

problem #6

Feb 102011


  • Automatic transmission
  • 38,000 miles


The contact owns a 2004 Hyundai XG350. The contact stated that while driving 15 mph the rpms increased excessively and the vehicle tried to accelerate. While depressing the brake pedal and shifting the vehicle in park, the vehicle did not move forward. The vehicle was taken to the dealer who performed a diagnostic test, a road test drive and found nothing wrong with the vehicle. The manufacturer was contacted and a claim number 54264 was filed. A representative from the manufacturer inspected the vehicle and found nothing wrong with it. The failure mileage was 38,000. Updated 03/31/11 updated 04/22/11

- Staten Island, NY, USA

problem #5

Nov 282010

XG350 6-cyl

  • 50,000 miles
We have a 2004 Hyundai xg 350, on at least a half a dozen occasions, while coming to a stop, the car would suddenly accelerate and would not stop while pressing on the brake, luckily we were able to avoid any accidents. We took it to our local Hyundai dealer on 10/20/10, they told us it was the throttle position sensor, they replaced it, said it was fixed. Yesterday, 11/28/10, it did the exact same thing again, only this time we weren't as lucky. My husband tried to stop as he pulled into our driveway, the car suddenly accelerated, and he ran into the front of our house. The front bumper of the car has minimal damage, our house has a huge dent in the front of it. Needless to say, it could have been much worse, he wasn't injured, but he or someone else could have been. The car is currently at our local dealership again, they called today and said they couldn't find a problem with it and Hyundai says they have no record of this problem on this model of car, so imagine my surprise to find several complaints on the NHTSA website. Someone is covering up this problem somewhere, I hope it doesn't take someone getting seriously injured or killed for something to be done about it.

- Vienna, WV, USA

problem #4

Jan 152006


  • 15,948 miles
Hyundai XG350 year 2004 model had unintended acceleration problem. The car jumped the curb when pulling into a parking spot. My foot was on the brake as evidence by my daughter. I tried to break numerous times, and finally the car got caught up on a bush. It was as if the gas pedal was stuck. The car just would not stop, and it was slightly damaged. Hyundai replaced the car, but rewrote the loan with the 10 K original down payment getting lost in the paperwork. Reporting this because I did not know of this forum back then. Contacted an attorney, but they said there was nothing that could be done with the matter.

- Las Vegas, NV, USA

problem #3

Jan 262010


  • 91,000 miles


While at slower speed trying to slow down by applying brakes, car accelerated on its own..seems like brake had no effect to slow down the I was about to hit car in front of mine, I shifted auto transmission stick of my car in parking mode while feet on brake..I was scared hell..never had happened like this ever driving.

- Peoria , IL, USA

problem #2

Feb 162007

XG350 6-cyl

  • Automatic transmission
  • 30,000 miles
- the contact owns a 2004, Hyundai XG350. The contact stated that a number of times when he applied the brakes the vehicle accelerated. The contact stated that on 02/16/2007 when he applied the brakes the vehicle kept accelerating and he hit the vehicle in front of him. The vehicle struck the bumper of the second vehicle and there was no damage, a police report was not filed. The contact stated that the roads were slick and wet and he was going uphill. The contact stated that there was slush on the road, and he was slowing down for a turn doing 5 mph. The contact stated that mechanic believed the failure was in the computer that controls how much gas flows into the engine. The current and failure mileage were both 30000.

- Niskayuna, NY, USA

problem #1

Nov 212005

XG350 6-cyl

  • Automatic transmission
  • 21,608 miles
The contact complained about sudden acceleration. The problem occurred when slowing down or after the vehicle came to a complete stop. The vehicle was involved in an accident. The contact was pulling into a parking space when the vehicle accelerated and ran into a building. The only damage to the vehicle was to the front bumper cover. Upon impact, the airbags did not deploy. The consumer was wear his seat belt. No injuries were sustained. The contact took the vehicle to the dealership. They could not duplicate the problem and no repairs were done. Updated 1/11/2006 -

- Waukesha, WI, USA

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