2015 Hyundai Sonata

Problems, recalls and owner-reported issues

Engine is the leading concern among 1,144 owner complaints filed for this model year. This is the 4th highest complaint count among 26 Sonata model years with reports.

Complaints by model year
  1. 1,144

Of the 2015 reports, 34 involved a crash and 48 involved a fire. 32 people were injured and 2 people died.

Primary concernEngine623 reports · 54% of complaints
Owner complaints1,144Filed with NHTSA
Recall relationship9 safety recallsNHTSA campaign records

What owners report most often

  1. Engine623
  2. Electrical system167
  3. Other or unspecified164
  4. Power train134
  5. Service brakes76
  6. Fuel/propulsion system75
  7. Steering74
  8. Vehicle speed control61

Recalls and investigations

  1. Exterior lighting, turn signalSep 24, 2021

    Hyundai Motor America (Hyundai) is recalling certain 2015-2017 Sonata, 2016-2017 Sonata Hybrid, and Sonata Plug-In Hybrid vehicles. The Smart Junction Box (SJB) software logic may not properly interpret the signals received from the multifunction switch, which could cause the turn signal to activate in the opposite direction of what the driver intended.

    A turn signal that activates in the opposite direction of what was intended by the driver increases the risk of a crash.

    Dealers will update the SJB software, free of charge. Owner notification letters were mailed November 19, 2021. Owners may contact Hyundai customer service at 1-855-371-9460. Hyundai's number for this recall is 210.

    Campaign 21V749000 on NHTSA.gov

  2. Parking brake, indicator lightJun 5, 2017

    Hyundai Motor America (Hyundai) is recalling certain 2015-2016 Sonata and Genesis vehicles. In the affected vehicles, the warning light to indicate that the parking brake is applied may intermittently not illuminate in the dash due to corrosion in the switch.

    If the parking brake indicator is not illuminated when the parking brake is applied, the driver may operate the vehicle with the parking brake partially engaged, increasing the risk of a crash.

    Hyundai will notify owners, and dealers will replace the parking brake switch, free of charge. The recall began on August 4, 2017. Owners may contact Hyundai customer service at 1-855-671-3059. Hyundai's number for this recall is 164.

    Campaign 17V359000 on NHTSA.gov

  3. Visibility, sun/moon roof assemblyOct 11, 2016

    Hyundai Motor America (Hyundai) is recalling certain model year 2015-2016 Sonata Hybrid vehicles manufactured December 8, 2014, to August 18, 2015, and Hyundai Sonata vehicles manufactured May 28, 2014, to March 18, 2016, equipped with the panoramic sunroof option. Due to a bonding issue with the sunroof wind deflector, the sunroof panel on the affected vehicles may detach while driving.

    If the sunroof detaches from the vehicle it could become a road hazard, increasing the risk of a crash.

    Hyundai will notify owners, and dealers will repair the wind deflector anchor plate, free of charge. The recall began December 2016. Owners may contact Hyundai customer service at 1-800-633-5151. Hyundai's number for this recall is 152.

    Campaign 16V726000 on NHTSA.gov

  4. Air bags, frontalApr 21, 2016

    Hyundai Motor Company (Hyundai) is recalling certain model year 2015-2016 Sonata vehicles manufactured May 29, 2014 to February 11, 2016, 2017 Elantra vehicles manufactured January 12, 2016 to February 22, 2016, and one 2016 Sonata Hybrid vehicle manufactured October 15, 2015. In these vehicles, the driver's frontal air bag may be missing a chemical enhancer required for the second stage air bag deployment, resulting in the second stage not deploying in certain crashes. The primary stage will deploy as intended.

    An air bag that does not inflate increases the risk of injury.

    Hyundai will notify owners, and dealers will replace the driver's frontal air bag module, free of charge. The recall began on May 5,2016. Owners may contact Hyundai customer service at 1-855-371-9460. Hyundai's number for this recall is 144.

    Campaign 16V232000 on NHTSA.gov

  5. Electrical system, instrument cluster/panelOct 20, 2015

    Hyundai Motor America (Hyundai) is recalling certain model year 2015-2016 Sonata vehicles manufactured May 28, 2014, to August 21, 2015. The affected vehicles are equipped with an Antilock Braking System (ABS) warning light intended to warn the driver if there is an ABS malfunction. In the event of an ABS malfunction, the Brake System warning light will illuminate, but the ABS warning light will not illuminate. Since the vehicles have ABS malfunction lights that do not illuminate, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 135, "Light Vehicle Brake Systems."

    If the driver is alerted there is a brake system malfunction, but not specifically with the ABS system, the driver may operate the vehicle unaware that the vehicle's brakes may lock up during hard braking, increasing the risk of a crash.

    Hyundai will notify owners, and dealers will update the ABS control unit software, free of charge. The recall is expected began on November 30, 2015. Owners may contact Hyundai customer service at 1-855-671-3059. Hyundai's number for this recall is 134.

    Campaign 15V678000 on NHTSA.gov

  6. Seat belts, front, buckle assemblyJun 30, 2015

    Hyundai Motor America (Hyundai) is recalling certain model year 2015 Sonata vehicles manufactured April 25, 2014, to December 4, 2014. The affected vehicles have a front passenger seat belt whose buckle latch assembly may prevent the front passenger from fastening the seat belt.

    If the front passenger seat belt cannot be latched, an occupant sitting in the front passenger seat has an increased risk of injury in the event of a crash.

    Hyundai will notify owners, and dealers will repair or replace the front passenger seat belt buckle, free of charge. The recall began on September 15, 2015. Owners may contact Hyundai customer service at 1-855-671-3059. Hyundai's number for this recall is 130.

    Campaign 15V414000 on NHTSA.gov

  7. Power train, axle assembly, axle shaftDec 9, 2014

    Hyundai Motor America (Hyundai) is recalling certain 1.6 liter model year 2015 Sonata vehicles manufactured August 29, 2014, to October 28, 2014. The affected vehicles may have been assembled with an incorrect left axle shaft which may result in the shaft separating from the transaxle differential.

    If the left axle shaft separates from the transaxle, the vehicle may stop moving, increasing the risk of a crash. Additionally, a separated axle shaft may allow the vehicle to roll away as the driver and other occupants exit the vehicle or anytime thereafter. A vehicle rollaway increases the risk of injury to exiting occupants and bystanders.

    Hyundai will notify owners, dealers will inspect and replace the axle shaft, as necessary, free of charge. Owners may contact Hyundai customer service at 1-800-633-5151. Hyundai's number for this recall is 126.

    Campaign 14V784000 on NHTSA.gov

  8. Service brakes, hydraulic, foundation components, disc, caliperDo not drive until repairedJun 24, 2014

    Hyundai Motor Company (Hyundai) is recalling certain model year 2015 Sonata vehicles manufactured April 25, 2014, through June 16, 2014. Due to a manufacturing error, one or both of the front brake calipers may fracture.

    If a brake caliper fractures, brake effectiveness would be reduced, lengthening to distance required to stop the vehicle, increasing the risk of a crash.

    Hyundai contacted the affected owners on June 19, 2014 and instructed them not to drive their vehicles. Hyundai dealers will replace the affected brake calipers, free of charge. The recall began on September 12, 2014. Owners may contact Hyundai customer service at 1-800-633-5151. Hyundai's number for this recall is 120.

    Campaign 14V368000 on NHTSA.gov

  9. SteeringDo not drive until repairedJun 12, 2014

    Hyundai Motor Company (Hyundai) is recalling certain model year 2015 Sonata vehicles manufactured May 2, 2014, through May 23, 2014. A poor connection within the vehicle's wiring harness may result in a reduction of steering assist from the vehicle's motor driven power steering system or the inability to move the vehicle's shifter from the Park position.

    The reduction of power steering assist can increase the steering effort needed, increasing the risk of a crash.

    Hyundai notified dealers to suspend sales of affected Sonata vehicles and has published recall bulletin 14-01-024 providing a service procedure to repair the affected vehicles. On June 7, 2014 Hyundai began to contact the affected retail customers. Owners may contact Hyundai customer service at 1-800-633-5151. Hyundai's number for this recall is 119.

    Campaign 14V325000 on NHTSA.gov

Representative owner complaints: fuel/propulsion system

75 reports, newest first. Show all

  1. Engine, Fuel/propulsion system, Apr 29, 2023, fire

    While driving on a highway, I heard a rattling sound, which could best be described as tying cans to the car and dragging them along the road. I had never heard this noise before. No safety indicator lights turned on to alert me of any issue. With minutes of first hearing the sound, a very loud pop noise could be heard, followed by immediate engine power failure. I was able to navigate off of the highway, into a more residential area. Upon the vehicle coming to a stop on its own (I was not able to apply the brakes at all), a dark cloud of smoke starting coming from underneath the hood. Seconds later, it burst into flames. I was able to safely exit the vehicle with my dog, but if traffic were any heavier, there would have been no safe way for me to get off the road and to a safe location

  2. Engine, Fuel/propulsion system, Mar 17, 2023

    I have a used 2015 Hyundai Sonata that I purchased from a Hyundai dealership in December 2021 (due to the chip shortage, I had to purchase used). A few months later In June 2022 I was driving on the freeway and my car felt like it was losing acceleration. I was already planning to exit the next exit to go to my destination and as I was exiting and came to stop at the red light before I could then turn right .. my car started to violently shake. Ultimately, after going to my own car place the following day and them determining that the fuel injectors and the computer were not talking, I had it towed to Hyundai where after another 4 days they also determined it was that problem and they replaced the computer under warranty. Well today I was again on the toll road / freeway and I was in the fast lane, I suddenly felt a strong jolt and my malfunction light came on and it was blinking on the dash, I knew not to drive it based on the light and as I steered to the right shoulder to slow / stop and call AAA I could feel my car just lightly shaking again. My car is now at the same Hyundai dealership where I purchased it and I’m waiting for diagnostics on the problem. Before this all happened, the first time in 2022 I was having sporadic issues with pressing the start button and there was a bit of a delayed start at times, even after the computer was replaced I’ve still had hiccups with the start button at times but it’s been very sporadic and it has never been a starter issue (had my car place already check that). So I’m now waiting to hear if the computer indeed failed for a second time. They cannot assess my car until Monday or Tuesday at the dealership (today was a Friday, my car was towed there at about 11am today). If the computer did fail again, it lasted about 14,000 miles before it just died again. Quite frustrated at the moment. I already contacted Hyundai corporate and opened a second case today regarding all of this.

  3. Electrical system, Service brakes, Fuel/propulsion system, Feb 26, 2023

    Sensors lights would indicate an issue and would disappear sometimes without any reason (mainly Check Engine and Tire Pressure Sensors). Indicators would trigger the opposite direction (indicate right and the left indicator would turn on). Burning more fuel than expected. Primary fuel pump stopped working resulting in car stopping in the middle of the road.

  4. Fuel/propulsion system, Feb 1, 2023

    Please refer to prior complaint #11505068 I want to add the fact that this vehicle's engine was replaced on or around Sept 1, 2019. This dealer asked me who replaced the fuel pump, and I responded it was replaced by Rick Case Hyundai where the car was brought to with the seized engine.

  5. Fuel/propulsion system, Feb 1, 2023

    I reported a fuel leak while the vehicle is in motion to the dealer on 9/12. They had the vehicle 3 days and could not find the leak although the service manger agreed he smelled fuel when the vehicle was brought in. They released the car without repair.

  6. Electrical system, Fuel/propulsion system, Nov 25, 2022

    This is the third time this has happened. The car just starts to beep and stops working wherever it is. Its died on the highway and another busy road during rush hour causing a dangerous backup in which the police needed to be called. The car just beeps and flashes on the dash "Hybrid System Warning! Safety Stop and Do not Drive". Also, "check charging system". The car just stops and basically dies on the road when this light comes. When this happens the steering wheel does not really work and the gas/breaks have limited function. This could cause a major accident on a major highway or even off of a highway. I am quite surprised that there has not been a recall for this serious safety concern.

  7. Fuel/propulsion system, Oct 20, 2022

    Strong odor of gasoline noticed after driving vehicle and smell remained present for a few hours after ending the drive. Found out that many drivers for the Hyundai Sonata and Kia Optima have had same complaints and the issue is a component of the fuel pump that is cracked. Traced it back to my vehicle, and that in fact is the problem. Since gas is combustible, this is a seriously dangerous defect.

  8. Electrical system, Engine, Fuel/propulsion system, Sep 29, 2022, fire

    While I was driving, my check engine light came on. It wasn’t flashing so I was going to continue driving to a parts house (because the dealerships around me were closed) and have them check the codes that were present. Immediately after I had that thought, I noticed the car was smoking and the battery light and the traction control light had come on, so I proceeded to pull over and shut the vehicle off. I got out and noticed the hood had soot on the edges. I called 911 and watched the car go up I’m flames. This all happened in less than a mile. I noticed a fluid of some sort had sprayed out of my vehicle onto the road and the underneath the vehicle was coated in the fluid. This is still being investigated but I know of a lot of Hyundai/Kia vehicles have caught on fire while driving. I’m not 100% sure of the cause yet, but I want to document that this did happen to my vehicle. I would love to update as soon as we figure out what has caused the car to catch fire while I was driving.

  9. Power train, Electrical system, Fuel/propulsion system, Sep 16, 2022

    This is yet another incident of a Sonata Hybrid hybrid flashing a warning to the driver and the the engine shutting down. This time it was Sep 7, 2022 in Morristown, TN. A brief internet search led to this: https://www.tsbsearch.com/Hyundai/17-HC-003-1 indicating that the issue is known to Hyundai. This is definitely a safety issue, this is a known problem, why was no recall issued?

  10. Vehicle speed control, Engine, Fuel/propulsion system, Sep 12, 2022

    My daughter was driving on the interstate when the car went into limp mode and the engine light was flashing. We had it towed to hyundia dealership where they did an engine update. Had it for 3 months when it did the same thing to her again. Had it towed again to same dealership where they are telling me it needs a new engine.

  11. Air bags, Engine, Fuel/propulsion system, Jul 29, 2022

    Engine burns 2 quarts of oil a week. Took it in for oil consumption tests and Hyundai figures out ways to not replace these faulty GDI Engines. Also car has a strong gas smell inside car. Maybe gas leaking. Airbag warning light has been on for years. Took it to the dealer in the past they said it's ok(Hub Hyundai Katy TX) but I don't feel confident.

  12. Power train, Engine, Fuel/propulsion system, Jul 25, 2022

    The vehicle is slow to accelerate and as its accelerating it often will jerk or hesitate roughly. There have also been times when accelerating, such as getting on a highway, that the whole (what I assume to be) throttle system will almost stop and it feels like the car is just going to stop right there on the highway. It's very dangerous as cars behind me are also accelerating and not expecting my vehicle to just stop. The vehicle is available for inspection. There are no warning lights, messages, or symptoms prior to the issue. It has not been inspected by anyone yet.

  13. Other or unspecified, Engine, Fuel/propulsion system, Jul 24, 2022

    Vehicle suddenly lost power while in operation. Vehicle was in motion approaching an intersection. When left turn indicator was activated, all lights on the instrument panel illuminated, the engine shut off, and power steering was lost all while the Vehicle was in motion approaching a intersection with stop sign. Vehicle was able to stop before entering the intersection, but would not start again and we were stranded in the middle of the road. Electrical systems appeared to be working. Battery and alternator are functioning normally. After Vehicle sat for 20min, it then was able to start and moved out of the road to a safe location. Vehicle was towed to mechanic that confirmed Battery health and alternator functioning. Vehicle was then taken to dealership for recall 210 safety repair. Dealership service unable to determine cause for loss of power while Vehicle in operation. No explanation, offer of additional service, or remedy has been offered despite requests. I do not feel it is safe to operate this vehicle in the absence of information related to the sudden loss of power during normal operation. Had this occurred in another setting with more traffic or less room for safely coasting to a stop, serious injury or worse could have resulted. The vehicle is still eligible for the 10yr 100k mile powertrain warranty and I am the original owner. We do not feel we can safely operate this vehicle and need guidance on how to proceed with pursuing a remedy to the situation from the vehicle manufacturer.

  14. Fuel/propulsion system, Jun 22, 2022

    While driving POV from work, I began smelling fuel in the air conditioning system from external intake. Upon further discovery, the high pressure fuel pump was found to be dislodged from the engine, due to a sheered bolt. This allowed fuel to spill out on the manifold and engine, also reducing power for acceleration. This issue could have caused a vehicle fire that could have engulfed the cabin if ignited.

  15. Electrical system, Engine, Fuel/propulsion system, May 26, 2022

    2 days ago my car had red orange like engine light came on while i am driving on [XXX] near [XXX] . next to [XXX] my car stopped running so I pull over and I call my local mechanic who sold me the car. JS AUTO In SANTA ANA, CA. He came in a towing truck. [XXX]. ALSO [XXX]. THEY WORK IN JS AUTO REPAIR MECHANIC SHOP. HE ALSO PUT A ENGINE IN MY SONATA HYBRID AND REDID THE MILEAGE ODOMETER IT WAS 49000 but the DMV REGISTATION PAPER SAID 146900 any way. I went to the mechanic shop last week complaining about engine light and they swap the something near the fuel hose entrance area. then 2 days my engine light came back on and [XXX] CAME TO ME ON [XXX] with towing truck ,he was asking what happening, and he ask for the KEY FOB. HE start the sonata and told me follow me in my towing truck to JS AUTO SANTA ANA TUSTIN SHOP SO I DID> I SPEND 5 hours not having lunch and break fast. I mention to him about LEMON LAW FOR PURCHASE USED CAR. HE TELL YELLED AT ME> I SAID I GAVE U COMPANY CASHG CHECK FOR 10,000. don't tell me what I can say can not say in front of your customers. he said go talk to TUSTIN HYUNDAI NEAR YOU> AND I LET LEFT THE SHOP AT 445pm because shop closed at 5,pm I thanked MANAGER [XXX] for buying LUNCH AT REDHILL CAFE STEAK CHEESE STREAL 12 inch sub sandwich. then I came home and google search on EVAP LEAK. because MANAGER [XXX] TOLD IT WAS EVAP LEAK ERROR ON THE MACHINE BECAUSE THEY BRING THE EVAP LEAK TESTER FROM JS AUTO GARDEN GROVE LOCATION< PLEASE GOOGLE JS AUTO GARDEN GROVE SO ANY FAULTY EQUIPMENT THEY ARE USING AND ANY BAD FINANCIAL DEALING THEY ARE DOING < I THINK THEY MIS CALCULATED MY USED CAR> I SHOULD PAY MAYBE 8500 or 7500 US DOLLARS> INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

  16. Fuel/propulsion system, May 13, 2022

    The vehicle has a very strong smell of gasoline and has been taken to the repair shop after spark plug flooding. Vehicle still smells like gas after repair but runs now.

  17. Power train, Fuel/propulsion system, Mar 23, 2022

    At low idle (stopping) car stalls out when stepping on gas. The RPMs run extremely high and very low at idle causing panic. The vehicle also stalled at full speed on highway but all electrical was still working. Car tends to sputter and jump while shifting.

  18. Electrical system, Engine, Fuel/propulsion system, Jan 3, 2022, fire

    The car caught fire. I only had the car for 3 weeks. I had just started the car for work. There were no warning lights on. If some unknown guy have not told me to get out my car i would had died.

  19. Fuel/propulsion system, Dec 20, 2021

    I took my vehicle to the dealership to have recommended service completed which included the fuel tank air filter. To complete this operation, the mechanic performed an M.P.I which showed that the fuel pump was leaking. I'm not an expert on anything, but I can't imagine a time that fuel leak is good. What's really concerning is that if I hadn't had the vehicle in for routine maintenance, this problem wouldn't have been found which could have led to catastrophic issues. I find it hard to believe that it's typical that a fuel pump fail with under 60,000 miles on the vehicle- who knows how long the fuel pump had been leaking. My tech at the dealership told me that they have seen this same problem with other 2015 Sonatas so I am certainly not the only one to experience this issue. I had to return the car to the dealership a few months ago for a recall that involved a fuel leak. I wonder if all of the fuel leak issues have been dealt with, fuel leak wise, with this vehicle. The sub total for this repair was $817.66. Thank you, [XXX] INFORMATION Redacted PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6).

  20. Fuel/propulsion system, Sep 23, 2021

    Heavy odor of gas in backseat and truck. Noticed odor in garage while parked and when driving had to roll down windows! I took to mechanic. He found a crack in fuel tank. My Hyundai had been at the dealership that week with them changing the oil and rotating tires but they did not acknowledge it! Mechanic informed me that this could be a very dangerous situation and should not be driven. Dealership no help.

  21. Electrical system, Engine, Fuel/propulsion system, Dec 14, 2020

    VEHICLE DRIVER RECEIVED AUDIO AND VISUAL ALERT WHILE DRIVING AT HIGH RATE OF SPEED THAT THE "HYBRID WARNING FAILED AND TO CHECK HYBRID SYSTEM-TURN ENGINE OFF" AND TO PULL OVER SAFELY. HOWEVER, THE VEHICLE LOCKED AND LOST ALL POWER MAKING IT IMPOSSIBLE TO SAFELY EXIT THE INTERSTATE ALMOST INSTANTLY AFTER THE ALARM. UPON RESEARCH, I MANAGE A LARGE VEHICLE FLEET, WE HAVE MULTIPLE OTHER SONATA'S WITH THE SAME ISSUE-AND THERE IS A TSB FOR THIS KNOWN SAFETY FAILURE (17-HC-003-1).

  22. Electrical system, Engine, Fuel/propulsion system, Jul 22, 2020

    WAS DRIVING ON SUNRISE HIGHWAY DOING ABOUT 55 MPH WHEN ALL OF A SUDDEN MY CAR START LOSING ALL POWER ACCELERATION AND WOULD NOT GO PASS 20/30 MPH. WAS ABLE TO GET TO SIDE OF HIGHWAY. BUT NOW CAR HAS ISSUES PICKING UP ACCELERATION. COULD HAVE CAUSED A MAJOR ACCIDENT.

  23. Fuel/propulsion system, May 1, 2020

    TL* THE CONTACT OWNS A 2015 HYUNDAI SONATA. THE CONTACT STATED WHILE DRIVING VARIOUS SPEEDS, THERE WAS AN ABNORMAL ODOR OF GASOLINE INSIDE THE VEHICLE. THE CONTACT DROVE TO RESIDENCE WITH THE WINDOW ROLLED DOWN. THE VEHICLE WAS TAKEN TO HYUNDAI OF LAS VEGAS LOCATED AT 7150 W. SAHARA AVE, LAS VEGAS, NV 89117, TO BE DIAGNOSED. THE CONTACT WAS INFORMED THAT THE FUEL INJECTORS AND FUEL PUMP NEEDED TO BE REPLACED. THE VEHICLE WAS REPAIRED HOWEVER, THE FAILURE RECURRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS APPROXIMATELY 37,000. THE VIN WAS NOT AVAILABLE.

  24. Fuel/propulsion system, Feb 20, 2020

    TL* THE CONTACT OWNS A 2015 HYUNDAI SONATA. THE CONTACT STATED THAT THE FUEL DOOR FAILED TO OPEN FROM DEPRESSING THE UNLOCK BUTTON INSIDE OF THE VEHICLE. THE EMERGENCY LEVER TO OPEN THE FUEL COVER IN THE TRUCK OF THE VEHICLE WAS ALSO INOPERABLE. THE DEALER OURISMAN HYUNDAI OF BOWIE 2404 CRAIN HWY, BOWIE, MD 20716 (866) 295-4674, WAS ABLE TO FORCIBLY OPEN THE FUEL DOOR. THE CONTACT STATED THAT A PART DETACHED INSIDE THE UNLOCKING MECHANISM. THE VEHICLE WAS NOT REPAIRED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 89,000.

  25. Other or unspecified, Engine, Fuel/propulsion system, Jan 29, 2020

    THE CAR SUDDENLY LOSES THE ABILITY TO ACCELERATE MAKING IT VERY STRESSFUL TO DRIVE AS YOU ARE NOT CERTAIN WHEN THIS WILL HAPPEN. AT FIRST IT IS INTERMITTENT BUT EVENTUALLY IT SIMPLY STAYS THAT WAY ONCE THE ISSUE BEGINS WHILE YOU ARE DRIVING, HENCE THE CAR WILL HAVE AN ALMOST IMPOSSIBLE TIME RETAINING SPEED ON THE HIGHWAY OR ACCELERATING AT A LIGHT OR AS YOU MERGE ONTO HIGHWAYS. CHANGING THE DRIVER MODE TO SPORT APPEARS TO HAVE A POSITIVE EFFECT AS IT CAUSES MUCH MORE AGGRESSIVE GEAR SHIFTING BUT IT THEN STAYS IN THE SAME GEAR FOR TOO LONG REACHING RPS THAT FEEL UNSAFE FOR THE ENGINE ITSELF. THIS IS NOW THE THIRD TIE THIS HAPPENS AND IT IS ALSO THE MORE SEVERE MANIFESTATION OF THE PROBLEM,. THE FIRST TIME THE DEALER ASSERTED THEY WERE NOT ABLE TO DIAGNOSE IT BUT RETURNED THE CAR WITHOUT THE PROBLEM. THE SECOND TIME IT HAPPENED THEY APOLOGIZED AND SAID THAT IT WAS AN ISSUE WITH THE ENGINES COMPUTER ALGORITHM, THAT APPARENTLY THE COMPUTER LEARNS FROM THE WAY IN WHICH ONE DRIVES AND SO IS ADAPTIVE BUT THAT SOMETIMES IT CAN BECOME CORRUPTED. THIS THIRD TIME THE DEALER TOLD ME IT WOULD TAKE ONLY A COUPLE OF HOURS TO FIX BUT NOW IT HAS BEEN THREE DAYS AND THEY HAVE NOT CALLED ME BACK. THEY DID LEAVE A MESSAGE THAT APPARENTLY THEY ARE ORDERING PARTS AND WILL BE FIXING IT. MY ISSUE NOW IS THAT ITS A THIRD TIME AND IT IS CLEAR THAT SOMETHING IN THE CAR IS DEFECTIVE AND NOW WE ARE GOING TO BE ALMOST COMPLETELY PARANOID OF IT HAPPENING AGAIN AT A CRITICALLY DANGEROUS INTERSECTION OR MERGE AREA. WE HAVE BEEN LUCKY SO FAR BUT IT IS A FAMILY CAR AND I DO NOT FEEL SAFE IN THE CAR ANYMORE GIVEN THE REPEATING NATURE OF THIS PROBLEM AND THE LACK OF INFORMATION OUT THERE FORM THE MANUFACTURER AS TO WHAT EXACTLY IS GOING ON.