2012 Hyundai Sonata: adaptive cruise control problems

Filed Nov 26, 2024 · Electrical, Engine · 125,000 miles · TX · fire

The contact owned a 2012 Hyundai Sonata. The contact stated that various functions on the steering wheel including the horn, cruise control, and other electrical functions; all failed to operate as needed. The vehicle was taken to an independent mechanic where the contact was informed that a warranty had been placed on the vehicle for the clock spring which they linked to the failure. The steering wheel also began to stick soon after the diagnosis. The dealer was notified of the failure; however, the dealer could not provide an appointment until months out. The contact then stated that while driving at 65 MPH, the vehicle began to hesitate upon the depression of the accelerator pedal. The contact began to pull over as the EPS(Electrical Power Steering) and several other warning lights appeared on the instrument panel. As the contact opened the door, a fellow motorist had also pulled over to alert the contact that the vehicle was on fire. Soon after exiting the vehicle, the entire vehicle quickly became engulfed in flames. The fire department quickly arrived on the scene and extinguished the fire. The contact was not injured, no other occupants were inside the vehicle, and the contact was unsure if a fire or police report was filed. Some of the grass and trees in the area had caught fire as a result of the failure. The remains of the vehicle was towed to an independent tow yard. The dealer nor the manufacturer had yet to be notified of the failure. The vehicle was completely destroyed. The failure mileage was approximately 125,000.

Filed Oct 26, 2022 · Acceleration · NV

Approx july 2022 My sonata began to malfunction, first the steering wheel buttons stopped working intermittently off and on unable to turn on and set cruise control, unable to use hands free phone options as well as unable to navigate cluster features, as the time goes on the problem gets worse and eventually do not function ever. I replaced the steering wheel buttons which fixed the issue temporarily only now the vehicle will engage cruise control, accelerate dramatically and continue to gain speed. I am unable to disengage cruise control via the brake pedal, or cancel option or steering wheel. If I depress the brake pedal it will begin to decelerate but once I let off the brake pedal the engine will revv high and gain speed again. Buttons begin to function in a reverse order meaning press cancel, cruise turns on, press set button, cruise will set, press set button cruise will disengage etc. The only way to disengage cruise and rapid acceleration in this dangerous scenario is to Press the on off cruise control button. Immediately stopped vehicle had it towed to dealership, they stated that they could not replicate the problem, however their diagnosis for the problem was due to incorrect brake fluid put in the vehicle and suggested to completely replace the entire brake system of the vehicle I declined as I felt that was not the problem in fact bizarre diagnosis. Only hyundai dealership has ever put any brake fluid in my vehicle... this is completely dangerous as when vehicle suddenly accelerated I was unable to turn it off I almost rear ended a vehicle on the freeway going 70 mph. I no longer feel safe in the vehicle and it sits collecting dust while I make monthly payments.

Filed Aug 11, 2021 · Brakes · NV

After driving one day, I noticed the brake lights on without anybody in the car, they would not turn off whatever I tried. The next symptom was the traction control turned off and would not function via dashboard button. the next symptom was, while driving, cruise control turned on without myself doing so, set it's speed and maintained, I was approaching a 4 way stop and depressed the brake expecting cruise control to disengage, it did not, I pressed the brake again this time holding it down while the car continued to revv, the engine continuing to attempt to speed up while pressing the brake. The only thing stopping the car was the on and off button on the steering wheel. I finally came to a screeching halt half way into the intersection, the brakes were locked up and vehicle would not move, the dealership claims no responsibility in anything and blames it in fact on myself putting the wrong brake fluid into the vehicle. I had not put anything into the vehicle, the dealership was the last to touch it when they did a complete engine replacement in Jan 2021. Vehicle is currently in their possession and available for inspection. No warning lights came on and vehicle began to function normally after, and I have not driven it since. I do not feel safe any longer in the vehicle. Dealership wants me to pay for all new brakes, rotors, brake light switch and brake flush, all which I feel is dancing around the real issue of the brakes and the cruise control. This is a real serious safety issue to anyone with this same vehicle and the potential for a serious possibly fatal accident, dealership doesn't seem to think it's a serious issue, and instructed me to drive the vehicle home, I did not!!!!!

Filed May 17, 2021 · Electrical · CA

When I learned my right brake light was out and upon further investigating I found that the socket for brake bulb was melted as well. I now need to replace the socket and wiring so the bulb will hopefully work properly. When I took my car in for an oil change recently, I was told the brake socket had melted the brake light assembly. Also which will now need to be replaced as well (Quoted $150 plus labor). Next thing is a little hard to explain, but short time later I was driving on freeway and my car will suddenly stop accelerating and start slowing down. Then will kick back up again like nothing happened, car didn't lose power during this. All power was sill on radio, lights ect.. The first time this happened it was so quick I didn't know what to think. Not long after that my daughter was driving this time and it did it again repeatedly will stops accelerating (on off on off on off). To the point we were slowing down quite a bit and had to put the flashers on, as suddenly as it started it stopped. Again no loss of power or steering ect. The only light that came on was my traction control light and wouldn't go off even when pressing the button. Since there wasn't any check engine light showing on instrument panel I have no clue what could be the problem. Side note I have had issues with my cruise control not wanting to work or occasionally will work. Two days later after this incident my daughter told me that all my lights we're on and doors were unlock. Car wasn't dead at that point. Turned them all the way off just in case but another day or so later car is unlocked and completely dead took a very long time to get started back up. At this point I have to disconnect the battery so that the lights won't go on and kill the battery. Outside of these issues I've had no problems with the car absolutely love my car. But am very concerned.

Filed Mar 3, 2021 · Acceleration, Electrical · 145,000 miles · NC

Brake light switch plunger does not retract as it should when the brake pedal is not being pressed, car looses acceleration and looses power. When driving on cruise control, break will depress and turn cruise off and on in dash.

Filed Dec 21, 2020 · Engine, Fuel system · 84,750 miles · AZ

My engine threw a rod at approx. 85000 miles (10/2019). Hyundai replaced the short block but since then I continue to have issues with my car. After they replaced the short block and I picked my car up, the car seemed to be running like it is not getting consistent fuel like it is supposed to. I have had it in the shop 4 times because the check engine light has come on. While I am driving, the car seems to lurch at random times and this issue has gotten so bad that this (what I call lurching) makes the cruise control shut off. One time I was using the cruise control to accelerate onto the freeway and the warning bells and whistles went off, the car stalled, then restarted itself with no check engine light on. The most recent time (10/26/20 - 11/10/20), they had my car for 6 weeks, they did not fix it. They put 337 miles on my car while they had it and I experienced the same issues I have been complaining about to them since the beginning, after I drove it 38 miles. They cannot seem to find what is wrong with my car or fix it. 10/2019 threw rod - replaced short block see attached 1/3/2020 replaced hsg belt - did not fix issue see attached date unknown - check engine light went off before they could run codes.unable to find issues - did nothing no paperwork 7/3/2020 - unable to duplicate concerns, provided software updates. 8/20/2020 I called san tan hyundai and told them I continued to have the same issues. I told them I needed a loaner car as I have no other means of transportation. I was advised they did not have one available but would call me when they did. They never called. The check engine light came on again on 10/25 while I was out of town so I took it to them 10/26. I have paid for 2 rental cars now while trying to get this issue resolved. 10/26/20 trans reset recycle cleared codes - did not fix issue see attached

Filed Jul 29, 2020 · Electrical, Lights · 135,000 miles · AL

Multiple parts have been replaced on my front end from what mechanics thought were the problem but my wheel still sticks/pull to the left while driving even after multiple front end work and alignments. Also, I've replaced head lights, tail lights, breaks and reverse lights numerous times because something keeps blowing them. When I press the volume button on the steering it changes the screen on the radio. I'm assuming it's something with wiring malfunctioning. The cruise control on the wheel doesn't always work as well

Filed May 15, 2019 · Acceleration · 116,000 miles · NC

While driving at any speed with the gas pedal depressed, the car will suddenly slow down when I hit a pothole or bump in the road. It does the same thing when using cruise control. For example, I'll be driving 50mph and I'll hit a bump in the road and my RPM and speed will drop. If I take my foot off of the gas then re press it, it re engages and accelerates again.

Filed Jul 13, 2018 · Acceleration · 70,500 miles · VA

When attempting to initiate cruise control on the highway only the on/off button will work, show with the illumination of the cruise light on the dash console. The set and resume buttons will only work approximately 30% of the time and the cancel button never works. When the system is allowing me to set it the only way to disengage it is via the brake.

Filed Jul 3, 2018 · Acceleration, Driver assistance · 55,000 miles · FL

When the headlights are in use, the car randomly loses power, headlights turn off, entire car just shuts down without warning, then after several seconds, powers back on. The lights, engine, everything turns off. Also, when headlights are in use, cruise control and stability do not work. The vehicle is in motion and this has happened on highways and city streets. I have taken my vehicle to the two nearest dealers and they refused to fix the vehicle. Generally, this happens when braking, using turn signals, changing to hi beam/low beam, but has also happened for no reason at all.

Filed Sep 21, 2016 · Electrical, Engine · 77,000 miles · PA

I purchased my vehicle 1/21/15 certified pre-owned w/ 39,011 4/10/15 as I was driving on a town road doing approximately 45 MPH, the vehicle shut off on me and turned itself back immediately. The heat was not on prior to the shutdown, but when the car turned back on, the blowers came on full blast. I explained to the dealer it was like my car was possessed. Mechanic only tested the battery at this time, battery is fine, cause is unknown. 8/3/15 engine seized with while driving approximately 60 on a state highway. Engine was replaced and later a recall was announced by the manufacturer. 9/18/16 vehicle shut off again while driving on an interstate doing approximately 80 MPH while switching lanes. Lost power steering briefly and the vehicle came right back on, all lights illuminated on the dash, radio came back on blasting (was not like that prior to shutting off). Maybe it was a coincidence or not, but the second I turned my left turn signal on, is when the vehicle shut off. It came back on maybe 3 seconds later. Original dealership claimed a loose connection with the battery caused it, however, they did no further testing or investigating. It is currently at another hyundai dealership getting assessed. From 2/20/15 until present, I have also been experiencing the controls on the steering wheel not functioning properly: ex. The mode button will mute the volume, the channel changer and volume will start making calls on my bluetooth call log or activate the voice controls. Volume will sometimes changes the channel or will increase instead of decrease and vice versa. Sometimes the channel changer will control the volume or mode, they do what they want to when they want to. Cruise control is inoperable most of the time. I have multiple videos and have shown the mechanics, but they claim to never be able to duplicate the problem. Cause, still unknown.

Filed Aug 6, 2016 · Brakes, Electrical · 86,000 miles · IL

Car will not shift out of park- was parked and went to shift into reverse and it would not shift, called mechanic used shift release button to get out of park, brake lights do not work, cruise control doesnt work, ecs light stays on. Took car in for recall, they sold us the brake padal switch that I thought was the recall but they said would solve the problem and it did not solve the problem!!! This is my 17yr olds car and I am very nervous to have her drive this car now, but it can not be until we figure out brake lights!!