After getting on the on-ramp on the highway I shifted my manual transmission from 4th to 5th gear to accelerate to 50 mph but the gear didn't shift to 5th and the engine was inadvertently revved up to 4 on the tachometer without any increase in speed; it felt as if I stepped down on the gas pedal while in neutral. I drove the next 25 miles home in 4th gear at 45 to 50 mph.

- St. Albans, VT, USA

The contact owns a 2011 Hyundai Elantra touring. While driving 20 mph, the vehicle independently accelerated. The contact stated that the failure was intermittent. On several occasions, while the vehicle was stopped at a traffic light, the rpms revved while the brake pedal was being depressed. The vehicle was taken to herb chambers Hyundai of auburn (located at 735 southbridge St, auburn, MA 01501, (508) 832-9990) to be diagnosed. The dealer cleaned the throttle body, but the failure recurred. Additionally, the throttle body was replaced by an independent mechanic, but the failure recurred. The manufacturer was not contacted. The approximate failure mileage was 75,000.

- Worcester, MA, USA

Initial issue was automatic speed control (cruise cntrl), will not stay engaged. Cruise no longer works in any way other than to turn it on. This issue began around Jan 2017. Next issue is ESC off light intermittently comes on and will not reset without restart. Latest issue is the 3rd brake light is the only brake light working. The brake lights and ESC issue began around March 2018.

- Kennesaw, GA, USA

While driving or stationary and pressing the gas pedal sometimes the car will suddenly and unpredictably increase in acceleration or rpms, respectively, way more than intended even after releasing the gas pedal. A couple points to note: 1) the car is a manual transmission and during the described episode if you press the clutch and put the car into neutral the rpms will suddenly jump to between 6000-8000 rpms where they will stay sometimes for a 1 minute before returning to normal; 2) during this unpredictable increase in acceleration or rpms (if while in neutral), the gas pedal feels stuck as though it does not return to its normal state; 3) while in gear and driving, taking foot off gas pedal does not realize a decrease in acceleration or rpms, rather the car continues to increase at a fast speed as though the car was being pulled; 4) turning the car off alone sometimes does not resolve the issue as upon next start of the engine the rpms will immediately jump to 6000-8000; 5) this issue occurs with and without the floormats; 6) the issue occurs most frequently at start up and often resolves itself after a couple dangerous and scary minutes of monitoring the acceleration and rpms in response your toggling of the gas pedal; 7) the issue was noticed initially at roughly 90,000 miles on the odometer and occurs about 3-5 times a month; 8) I live in san francisco, California

- San Francisco, CA, USA

When accelerating, the engine does not always de-accelerate when the gas pedal is released. This is sporadic and unpredictable. Our mechanic thinks it is a fault in the throttle body. It is dangerous because after accelerating the car will continue to accelerate for up to 10 seconds after my foot is off the gas pedal. Or between shifts (manual transmission) the RPM will go dangerously high because the clutch is pushed in and briefly no load on the engine. The car does not need to be moving for this to happen. It is a throttle control issue, as determined by our mechanic. It has happened numerous times over the last year.

- Dundas, NY, USA

Was parked in a parking lot of a drug store for maybe 10 minutes. Started the car and backed out of parking space. When I put the car in drive to go forward the car accelerated to a very high speed and ran into two parked cars. With help I tried to back out of the space but when I went forward the car once again accelerated to a high speed damaging my car and the two other cars. Several years back I pulled into a parking lot to mail a letter. When I put the car in reverse to back out of the parking lot, the car accelerated at a high speed and backed into a snow bank. I thought at the time that I had accidentally stepped on the accelerator instead of the break but read the exact same experience from a Hyundai owner.

- Mansfield Center, CT, USA

I bought this car in 2010 and since then my car started giving trouble they change my transmission 3 times in 100000 mile and after that I started having trouble speed peddle. When I push my speed paddle car will drive without pushing paddle. When stop at light I have to push my brake very hard because my RPM of car is 5000 then I have to put car in neutral at that time RPM goes more than 5000. Then I went to dealer 1 rickcase Hyundai roswell Georgia.they cannot fix same problem again. So I went to other 2 dealer autonation Hyundai mall off Georgia. Iwent there for 3 time one time I drop my car for 2 day so they can find problem. My warranty is gone but I am trying to fix my problem.I call Hyundai motors at no 18006335151. Talk to person and he connect to manager and manager is telling we cannot do any thing if the dealer cannot find problem.it is very risky to drive car with this problem if you can help me out I have complain before but there is no response from your side I don't have date and time. [xxx] information redacted pursuant to the Freedom Of Information Act (FOIA), 5 U.S.C. 552(B)(6).

- Suwanee, GA, USA