Power Train Problems of Hyundai Sonata - part 2

My 2022 Hyundai Sonata hybrid started blowing white smoke from the exhaust. Took it to the dealership and was advised the valve that controls antifreeze failed and leaking antifreeze in exhaust. This caused the engine to overheat and would cause the engine to blow up. My car has 83,000 and was told the manufacturer warranty only covered to 80,000 and extended warranty would not cover the part. Was told it would cost 2659 to fix. This is part of the hybrid power train and should be covered under the 100,000 Hyundai warranty. I have seen the same issue with other Sonata hybrids on the internet that is doing the same as mine. Hyundai needs to recall for this since it is a needed component for the engine.

See all problems of the 2022 Hyundai Sonata 🔎.

While driving with my family on a busy freeway at approximately 70 mph, our vehicle suddenly displayed a loud, urgent warning: “hybrid system warning – safely stop and do not drive!” at the same moment, the car lost the ability to accelerate without any prior signs of trouble. We were extremely fortunate to have enough momentum to coast to the shoulder and shut the vehicle off, unsure of how serious the issue might be. Being stranded without warning on a high?speed highway put my entire family in a dangerous situation. After a few minutes, we restarted the car to see if we could at least get it off the freeway. The warning had disappeared, and the vehicle drove normally, allowing us to take back roads home. The lack of any prior symptoms makes this even more concerning. Losing acceleration at highway speeds with no warning is a major safety hazard. We took the vehicle to a dealership immediately, but because the warning light was no longer active, they were unable to diagnose the problem. A few days later, the same warning appeared again—this time only a couple minutes from home. I turned around immediately for safety, parked the car, and once again the warning disappeared as soon as the vehicle was shut off. At this point, we have a car sitting in our driveway that we do not feel safe driving. The dealership cannot identify or repair the issue unless the warning is active, & even then, they cannot guarantee that a diagnostic code will appear. After researching this problem online, it’s clear that many other Hyundai owners are experiencing the same issue, often spending thousands of dollars without a definitive fix. Despite how common & dangerous this problem appears to be, there are no recalls & no consistent guidance from dealerships. This situation is unacceptable from a safety standpoint. A vehicle that can suddenly lose power at highway speeds—with no warning and no reliable way to diagnose the cause—poses a serious risk to everyone and needs to be investigated.

See all problems of the 2014 Hyundai Sonata 🔎.

I own a 2021 Hyundai Sonata 1. 6t, which has an open NHTSA safety recall (25v796000) related to fuel tank pressurization and fire risk. I brought the vehicle to an authorized Hyundai dealership due to a check engine light, reduced performance, and dtc p14ee, which aligns with the recall condition. The dealership refused to treat the concern as recall-related unless I paid a diagnostic fee and later attempted to reclassify the issue as a customer-pay fuel pump repair. During this visit, the dealership replaced a fuel system sensor without my authorization, which I did not approve or consent to. The dealership has not provided documented test results explaining how the recall condition was ruled out and has not documented recall inspection on the repair order. I expressed that I do not feel safe driving the vehicle due to the fuel system recall and drivability issues. The dealership also refused to provide alternate transportation. I am concerned the recall is not being handled in compliance with NHTSA requirements and that unauthorized repairs were performed while attempting to shift a recall-related condition to the customer. I am requesting review of recall handling and dealer compliance.

See all problems of the 2021 Hyundai Sonata 🔎.

Oil pressure sensor failure caused oil to leak into the injector harness damaging components and engine shutdown. Because this was a sudden engine shutdown and safety-related loss of motive power caused by an oil pressure sensor failure this presents a safety risk.

See all problems of the 2016 Hyundai Sonata 🔎.

Vehicle without warning will start to jerk then go into “limp” mode. Pressing on gas pedal makes the revving noise but with not physical movement made. This has happened on multiple occasions (13 times in 4 months) including in the snow and on the interstate while driving at 70mph where no shoulder is available to pull over. Car was taken to dealership 3 different times with no actual diagnosis, tests were ran all 3 times with nothing. Eventually the 3rd time at the dealership I was told the transmission was being replaced although they were not sure what actually caused the issue (this is written in the service report by the rep/mechanic). Car remains unsafe and unreliable. Livelihood of myself, family and other drivers is at risk everytime I put the car in drive due to this mechanical issue. No warnings no power no fix.

See all problems of the 2023 Hyundai Sonata 🔎.

Subject: excessive engine oil consumption – 2016 Hyundai Sonata I am reporting an ongoing and excessive engine oil consumption issue with my 2016 Hyundai Sonata that I believe may represent a safety defect or other significant reliability concern. The engine is burning oil at a rate far beyond normal expectations (requiring frequent top-off well below recommended mileage intervals), resulting in dangerously low oil levels while driving. I have maintained the vehicle per manufacturer recommendations and documented oil add-ins and dealer visits, but the problem has worsened over time. Despite presenting this problem to my Hyundai dealership, they have declined to authorize engine cleaning or further corrective action due to the mileage. I am struggling with high oil consumption and potential risk of engine failure while driving. This issue is not unique to my vehicle — numerous similar complaints exist in Hyundai forums and in other owners’ submitted complaints (e. G. , reports of more than 1 quart consumed every ~500–1,000 miles and sequences of denied repairs) which suggests a broader pattern of oil consumption failures for this model year. Auto safety +1 I believe this may represent a safety defect because loss of engine oil can lead to engine seizure or failure without warning, increasing the risk of a crash or injury. Please review this complaint, add it to the NHTSA vehicle database, and contact me if further information is needed.

While driving on the highway, my 2018 Hyundai Sonata experienced sudden loss of engine power and became undrivable. The failure occurred without warning at approximately 86,500 miles. At the time of the incident, there were two children in the vehicle, and the breakdown occurred at night in cold temperatures (approximately 20°f). An authorized Hyundai dealership later diagnosed zero compression in cylinder 3 and confirmed a cracked piston, recommending full engine replacement. The sudden loss of power while driving created a safety risk due to traffic conditions and environmental exposure.

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2022 Hyundai Sonata n line, VIN [xxx] , purchased August 15, 2025 with low mileage under original manufacturer warranty. Within 3 months, recurring transmission and drivability failures began. Six repair visits since November 2025; 71+ cumulative days out of service within 8 months. Visit 1 (11/24/25, 14,748 mi): hesitation/failure to accelerate from stop. Could not duplicate. Visit 2 (12/4/25, 14,800 mi): same concern. Fault codes found; auxiliary pump and relay replaced. Visit 3 (1/19/26, 15,982 mi): check engine light, jerking. External oil pump leaking; replacement required. Visit 4 (1/30/26, 16,025 mi): check engine light. Tcu update, dct learning performed; declared resolved. Visit 5 (2/19/26, 16,119 mi): check engine light returned. Transmission oil pump failed; replaced. Visit 6 (4/14/26, 16,945 mi — open 44+ days): post-repair lurching, infotainment failure, ongoing jerking. On 5/28/26, the service manager at mcdonough Hyundai (mcdonough, GA) stated the vehicle likely requires a complete transmission replacement and disclosed approximately 4 additional vehicles at the same dealership with identical unresolved issues. Hyundai motor America refuses to authorize repairs or techline escalation unless the dealership confirms the intermittent concern — a structural barrier that prevents warranty resolution. Safety concern: repeated failure to accelerate normally from a stop creates direct risk of rear-end collision or inability to clear intersections. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

Airbags did not deploy no indicator light came on before nor after I was struck from my driver side front area and yes it is available for inspection upon request. My safety along with my sisters safety was put at risk due to the negligence and cheapness of the dealership I purchased the car from also from there misleading information and improper inspection before selling me the car car has not been reproduced or confirmed the car was inspected by a third party appraisal company for damages amounts there were no lights on at all before the accident and I am pretty certain that the dealership cleaared the codes before selling me the car.

See all problems of the 2017 Hyundai Sonata 🔎.

The contact owns a 2016 Hyundai Sonata. The contact stated that while driving and depressing the accelerator pedal, the vehicle failed to respond or exceed 30 mph. The contact stated that the speedometer reading was lagging. The contact stated that the vehicle accelerated as intended while depressing the accelerator pedal with more force. The vehicle was taken to an independent mechanic, where the camshaft position sensor was replaced. Additionally, the contact stated that the starter was previously replaced due to the engine's failure to turn over while starting the vehicle. The contact stated that upon switching to sport mode and driving 40 mph, the vehicle jerked and lost motive power. The contact shifted to neutral(n) and was able to pull to the side of the road. The vehicle was able to restart the vehicle, but the vehicle was undrivable. The vehicle was towed to an independent mechanic, where it was determined that the failure could be an electrical failure or that an engine replacement was needed. The vehicle was not repaired. An unknown dealer was notified of the failure, but the vehicle was not diagnosed or repaired due to the cost. The manufacturer was not notified of the failure. The failure mileage was approximately 152,000.

On November 10, 2025, my 2016 Hyundai Sonata hybrid (VIN [xxx] , approximately 150,000 miles) experienced a sudden loss of power while I was turning right and accelerating into traffic. The vehicle immediately entered limp mode with flashing warning lights and audible alerts. The vehicle lost normal propulsion and could not accelerate properly, creating a dangerous situation as it was blocking a traffic lane. I was forced to limp the vehicle into a nearby parking lot to get out of traffic. The vehicle was not safely drivable afterward and was towed home. A few days later, the vehicle was towed to murdoch Hyundai in lindon, utah, for diagnosis. The vehicle was found to have diagnostic trouble code p1326, which Hyundai identifies as activation of the knock sensor detection system (ksds) related to connecting-rod bearing wear. This condition is part of Hyundai’s known engine defect and safety recall/warranty extension programs. During inspection, the dealer observed that the valvetrain did not show signs of neglect or sludge, which is inconsistent with oil starvation or severe maintenance neglect. This further supports that the failure is consistent with the known connecting-rod bearing defect addressed by Hyundai’s ksds safety recall, rather than a maintenance-related issue. This is a safety issue because sudden loss of propulsion or reduced power while entering traffic creates a high risk of collision. Hyundai customer care has been unwilling to open a new case number or escalate review, and the dealer has indicated possible denial of engine replacement coverage based on incomplete oil-change records, despite the vehicle exhibiting the ksds safety condition. I am requesting NHTSA review of this safety-related defect and the manufacturer’s handling of ksds/p1326 failures. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The vehicle experienced an engine and power train failure while driving on the highway, resulting in sudden loss of power. The electrical system also failed after the dealer visit, causing the battery to die every morning. Yes, the vehicle is available for inspection upon request. My car suddenly lost power on the highway and would not accelerate, forcing me to pull over on the shoulder with traffic moving around me. This created a serious risk of a rear-end collision or crash. Additionally, after the dealer visit, the electrical system began failing and the vehicle has been completely dead every morning, leaving me stranded with a child and unable to reliably start the car. The problem has not been reproduced because the check engine code cleared itself after the incident; however, the symptoms absolutely remain. The dealer refused to diagnose the loss-of-power event because the code was cleared, and they returned the vehicle to me with a dead battery. The electrical issue (car dying every morning) has been happening consistently since the dealer visit. The vehicle was taken to a Hyundai dealership immediately after the incident, but they refused to diagnose the loss of power due to the code being cleared. A mobile mechanic scanned the code at my home before the tow, but the code disappeared afterward. The electrical failure began after the dealer visit and has not been properly inspected by Hyundai. Yes. While driving on the highway, the check engine light came on and the car immediately lost power and would not accelerate. After the dealer visit, the car has been completely dead every morning and requires a jump to start. These symptoms began on the same day as the highway incident and continued after Hyundai serviced the vehicle.

The engine/powertrain on my 2015 Hyundai Sonata (VIN: [xxx] ) has failed due to extremely low compression in all four cylinders, causing severe misfires, hard starting, loss of power, and intermittent rattling noises, and the vehicle is currently available for inspection at the Hyundai dealership. This failure created a safety risk because the engine hesitates, struggles to start, and can stall or lose power during driving, which could lead to a loss of control or an inability to accelerate in traffic. The problem has been confirmed by both an independent mechanic and the Hyundai dealership, who documented low compression across all cylinders. The vehicle has been fully inspected by the dealership on Hyundai’s behalf after I opened a case with the manufacturer. Prior to the complete failure, the car showed warning symptoms such as repeated cylinder 4 misfires, rough starting, reduced power, rattling noises on startup, and the check engine light appearing several times beginning earlier this year. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

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During multiple dealership visits in 2025, my 2018 Hyundai Sonata limited 2. 0t was repeatedly returned in unsafe condition. Southern Hyundai installed both front cv axles and torqued them incorrectly. The right axle was later confirmed under-torqued by about 50 ft-lbs, and the left axle was later found over-torqued 40ft-lbs priority Hyundai later identified and corrected the under-torqued right axle, which briefly improved symptoms but did not resolve the underlying issue. When I returned for a follow-up on October 29, 2025, for a documentation-only appointment due to an active corporate case, the dealer ignored my instructions and altered evidence by loosening and re-torquing the left axle nut without consent. They recorded the torque at 250 ft-lbs in the repair order but failed to capture the required photos or before/after readings and referenced the wrong vehicle’s torque specification (Hyundai elantra) in the documentation. Since then, the vehicle has continued to show steering pull, vibration, and instability at speed. Several visits showed only 0–3 miles of verification driving after safety-critical repairs involving brakes, suspension, and driveline components. Aftermarket parts were installed when oem parts were promised, and uneven tire wear developed quickly. Safety risks include wheel-bearing damage, steering loss, and driveline separation due to repeated improper torque and altered evidence. Independent firestone and Honda technicians have verified these issues. The matter remains under active Hyundai corporate case #[xxx]. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The contact owns a 2021 Hyundai Sonata. The contact stated that while driving at 30 mph and depressing the accelerator pedal, the vehicle failed to respond and lost power. The vehicle was coasted over to the right side of the road, turned off, restarted, and returned to normal functionality. An independent mechanic was contacted. The vehicle was taken to an independent mechanic to be diagnosed; however, the diagnosis was unknown. The vehicle was not repaired. The contact related the failure to NHTSA campaign number: 22v746000 (power train); however, the VIN was not included in the recall. The manufacturer was not notified of the failure. The failure mileage was 35,000.

High engine oil consumption 2 qts every 1k miles.

Good day, please note that most of my communication with Hyundai has been over the phone. I sent one an email shortly after the event, and after following up on the phone, I received this following string separately. I can forward you more along the way, but Hyundai is in possession of the call recordings. I was hoping they would cover my repairs, my engine had a lifetime warranty, but during this process I learned that there was a recall for this car that I was never aware of as the new owner. I needed a software update to get any repairs covered. Please reach out to me for more info!.

See all problems of the 2011 Hyundai Sonata 🔎.

Vehicle stalled while driving.

See attached document for complaint.

See all problems of the 2024 Hyundai Sonata 🔎.

The contact owns a 2024 Hyundai Sonata. The contact stated that while attempting to accelerate to overtake another vehicle at approximately 60 mph, the vehicle unintendedly decelerated to approximately 20 mph instead. The contact pulled over to the side of the road, turned off the vehicle for approximately 20 minutes, before restarting and continuing to drive. There were no warning lights illuminated. The failure had occurred three times. The vehicle was taken to a certified mechanic, who diagnosed that the transfer case had failed and referred the contact to the dealer for assistance. The vehicle was taken to the dealer, who was unable to determine the cause of failure. The vehicle was repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 16,500.

On [xxx] iwas driving coming back home from [xxx] by exit [xxx]. The engine turn off and didnt turn back on. I had to get a town to take me out of the highway and pay $141. 00 becide that my engine seized. Now I dont have a car and the car didn't gave me any notification that something it was going on with the engine. If I had any light on the car I wil take it to the mechanic, know I loss my source of income because Hyundai problems with engine. And to get another engine it cost $5000. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

The contact stated that while driving at various speeds, the vehicle would jerk upon depression of the accelerator pedal without warning. In addition, the contact stated that on multiple occasions while turning into a parking lot, the vehicle's collision avoidance system would engage while in the vicinity of another vehicle as a warning chime would emit from the vehicle. The vehicle was taken to a dealer where they initially could not diagnose or duplicate the failure. The contact was asked to come and drive the vehicle herself and she was able to duplicate the failure. The dealer eventually diagnosed the vehicle with a failed transmission and remained in the dealer's possession. The manufacturer was notified of the failure. The contact was later informed that they would not replace the vehicle but would replace the transmission. The vehicle had yet to be repaired and remained in the dealer's possession. The failure mileage was approximately 50.

See all problems of the 2025 Hyundai Sonata 🔎.

2021 Hyundai Sonata with approximately 39,000 miles. On 8/21/2025, the dashboard displayed the following message "shifter system malfunction! service immediately" when the warning appeared, the vehicle shifter button would not function, creating a traffic safety risk. History: dealer service history shows the transmission was replaced on the vehicle under warranty on 08/30/2021 with 2,212 miles with no campaign/recall issued. Dealer states there is no recall campaign on this vehicles specific VIN # and NHTSA currently shows no open recalls for this vehicle. However, Hyundai advertises an 8-speed dct safety recall for the same year, make and model, and describes this identical issue, but has left this vehicle's VIN# out of scope for this recall, which is continuing to demonstrate the same issues. Current dealer/manufacturer response: on 9/4/2025, the dealer declined warranty or recall repair unless the fault was active on their diagnostic scan at the moment the scan was performed. A photo was provided to the mechanics of the dashboard showing the transmission service warning, with current mileage. The dealer advised there were no diagnostic log history showing the transmission error code even with photographic proof and attempted to return the vehicle to me. I have rejected the return of the vehicle and advised that this needs to be escalated, because if logs are not appearing, this is even a bigger cause for concern and that the vehicle is a safety hazard. Concern: because this vehicle required an early transmission replacement and is now exhibiting new transmission/shifter warnings, I am concerned the failure relates to the known transmission/shifter recall on this model and that the recall scope and/or remedy is incomplete for the affected vehicles including my VIN #. It is also possible the dealership is attempting to run out the warranty which expires in 3 months. Vehicle, photo of the warning, and service records are available for inspection.

While driving about 45 miles per hour the gas engine shut off and the electric engine lost power, were able to coast a few miles under low power under electric engine and then engine shutdown completely and would not start, had car tolled to nearest mechanic, he confirmed eninge damaged by rod bearing failure, he tried to get a new engine to replace the damaged one and Hyundai told him they could not sell him and engine.

Not sure . The car has been regulaurly maintenced and one day the emgine complagely seized up going down the road .

The contact owned a 2018 Hyundai Sonata. The contact stated that while driving at an undisclosed speed, the vehicle sputtered, jerked and lost motive power. The check engine warning light was illuminated. The vehicle was able to restart but made an abnormal ticking sound. The vehicle was taken to the dealer, but was not diagnosed or repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 72,000.

What component or system failed or malfunctioned, and is it available for inspection upon request? the engine in my 2017 Hyundai Sonata sport is defective. Oil pressure failed testing, oil contamination was found on the oil pressure sensor and connector, and the vehicle has experienced excessive oil issues. The engine is still in my possession and available for inspection upon request. How was your safety or the safety of others put at risk? the vehicle has gone into limp mode on the highway, which caused a sudden loss of power and created a dangerous situation in traffic. The car also shakes, misfires, and loses power unexpectedly, which could lead to stalling or loss of control at highway speeds. I do not feel safe driving the car. Has the problem been reproduced or confirmed by a dealer or independent service center? yes. Multiple Hyundai dealerships have inspected the car. One confirmed low oil pressure and oil contamination at the sensor. Previous visits dismissed the oil warning and charged me for oil replacement instead of identifying the underlying defect. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? yes. The vehicle has been inspected by Hyundai dealers multiple times. I also have two inspection reports from the same dealer just two weeks apart with contradictory findings the first showing no oil issue, the second confirming oil contamination and failed oil pressure. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? yes. The oil warning light and check engine light have both come on. The vehicle has gone into limp mode, and symptoms have included shaking, misfiring, rough idling, and loss of power. These issues began months ago and have continued despite repeated service visits.

While driving on the highway, the motor all of a sudden lost all power and the brakes locked causing a collision. I've never had any problems until then. My car was in tip top shape with no issues until the engine / motor decided to defect. Hyundai she recall this engine issue before someone gets killed.

I am leasing a 2017 Hyundai Sonata from car city in michigan. In may 2025, the vehicle received a brand-new engine replacement due to previous problems. I picked the car up on [xxx], and on the same day, the vehicle began malfunctioning. It would not accelerate properly, jerked and stalled, and multiple warning lights — including the check engine light — came on immediately. This made the car unsafe to drive. I contacted the dealer, but they told me to wait until Monday to get it looked at, leaving me with a dangerous and unreliable car. The vehicle had already been in the shop for over two months for the engine issue, and I had only driven it for six months beforehand. I believe the repair or replacement engine is defective or was not properly installed. This creates a serious safety hazard. A car that stalls while driving puts everyone at risk. I am filing this complaint so this issue can be investigated and addressed if others are affected. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

After initial startup and drive for a short time, I come to a stop. Then after vehicle doesn’t want to accelerate as it normally would. Vehicle struggles to gain speed but, the engine revs excessively. I pull off the road and come to a stop and try to accelerate again and the same thing happens. I shut the vehicle off and wait a few minutes,then restart and the vehicle accelerates normally again. There were no check engine lights the when this has happened.

The contact owns a 2020 Hyundai Sonata. The contact stated that the vehicle hesitated while depressing the accelerator pedal, with the check engine warning light illuminated on the instrument panel. The vehicle was taken to several independent mechanics and dealers to be diagnosed; however, the cause of the failure was not determined. The contact stated that one mechanic replaced an unknown sensor, but the failure returned soon after the repair. The manufacturer was notified of the failure. The vehicle was not repaired. The failure mileage was approximately 101,000.

See all problems of the 2020 Hyundai Sonata 🔎.

Vehicle's engine seized completely at 75 mph on the interstate. No warning lights or abnormal noises were present before catastrophic failure, and the car has been serviced recently. Cel came on at time of failure, throws code p1326. Car rapidly/dangerously decelerated, would have crashed if not driving in the leftmost lane of travel.

All documents are attached as it is many separate incidents that ended knock from motor and minutes later, a piston shooting through the engine block which is what made the car inoperable.

The car in recent months has twice lost power and been rendered in operable on the side of the road until it could be limped home. I had the car serviced last year for a recall of a fuel filter gasket and at that time I was informed that I also had an update done for a (k knock?) sensor prior done on the car before purchase. I inquired about what that was, and they told me at the time it was for an engine recall because that particular engine I have is known to have rod bearing failure and consume oil without any trace of where it goes and piston rattle. I told the gentleman after my fuel gasket was taken care of that I would like to look into that because I have the symptoms and would like to know. At that point in time, I was told that I may have to do an oil test to see if the car loses oil. I said well can we do that and he told me it's $300 out of pocket. I asked on average before anything ever done by Hyundai, how many times do people have to do this? he said 4 to 6 in his experience. I told him I did not have the money, but I will keep an eye on the car. Everything's been fine for six months a few months ago randomly driving to work the car shut down on me. We got the car home and my fiancé did an oil change and new spark plugs and the car worked fine. June 9th 2025 on my way to work the issue happened again in the middle of traffic. I called my fiancé and we got the car home. He performed another oil change and spark plug replacement and took pictures this time because the spark plugs are gunked up. The car now runs again. He called Hyundai of America on my behalf to just ask them if they could set up the test to see if the car was failing and they told him that they were all independent Hyundai and he would have to pay the test fees. He told them in a formal email that he doesn't believe under the federal recall he is responsible for that and they answered back that he may be reimbursed. We are contacting you because we were advised to on the issue.

The contact owns a 2013 Hyundai Sonata. The contact called to report a technical issue with a Hyundai technical service bulletin and the software that the manufacturer was reprograming for the Hyundai transmissions; TSB number: 13-at017. The contact, a certified mechanic, purchased a 2013 Hyundai Sonata from a customer due to the transmission failure. The contact attempted to order a new transmission from the manufacturer, but no transmission was available. The contact ordered a compatible transmission from kia. The contact successfully installed the transmission. The installation instructions which stated that the motor control unit and transmission control unit software needed to be reprogramed. The contact was able to successfully road test the vehicle and then had the vehicle towed to a dealer. The contact stated that after the software was reprogramed, while attempting to road test the vehicle, immediately there were several unknown warning lights illuminated. The contact checked online and determined that the TSB issued by Hyundai for the software reprograming outlined temperature values that were not the values show on the testing equipment. The contact called the dealer and was informed that using the kia transmission in a Hyundai vehicle, there was no assistance to be offered. The contact diagnosed the vehicle and determined that the Hyundai software was incorrect and wanted to notify the NHTSA of the failure. The vehicle was not repaired. The manufacturer was informed of the issue. The failure mileage was not provided.

See all problems of the 2013 Hyundai Sonata 🔎.