Engine And Engine Cooling Problems of Hyundai Sonata - part 2

Was driving car and it went completely hot. Towed to a dealership and they said was not drivable and that the radiator support and radiator hose needs replacing and eventually the drive cv left and front will need replacing or I will be stranded on side of road.

See all problems of the 2015 Hyundai Sonata 🔎.

My 2017 Hyundai Sonata hybrid has a permanent and recurring dtc p1326 (knock signal range/performance) from the knock sensor detection system (ksds), indicating potential connecting rod bearing wear in the nu 2. 0l engine. The vehicle enters limp mode (reduced power, limited acceleration/speed) on the highway under load, with hard engine vibration, tinkling/knocking noise from under hood, and significantly reduced mpg. These symptoms create a serious safety risk: sudden loss of power at highway speeds (e. G. , 50+ mph) makes it difficult to maintain speed, merge, or avoid hazards, increasing crash risk or stranding in traffic. In rare cases, bearing wear can lead to engine seizure or failure. The problem first appeared summer 2024 at approximately 115,000 miles. The check engine light illuminates (cristmass tree), and limp mode triggers during highway driving. I have an obd scan showing confirmed, pending, and permanent p1326, plus related hybrid communication codes (u0293, u1004) likely secondary to the protection mode. The vehicle has been inspected multiple times (four visits) by a Hyundai dealer. Each time they scanned the code, performed basic checks, but stated “engine is working normal, no road vibration, nothing” and did not resolve the issue. The code returns immediately after clearing. I replaced the knock sensor, engine mounts, spark plugs, ignition coils myself—did not fix it. Dealers did not perform the full bearing clearance test or follow TSB 22-01-023h (service campaign t6g) procedure as required for this known issue (related to recall 209 and campaign 966). The component (engine/connecting rod bearings) is still in the vehicle and available for inspection. No police, insurance, or other parties have inspected it beyond the dealer. This matches a widespread known defect in 2011–2019 Sonata hybrids (bearing wear triggering p1326/limp mode).

See all problems of the 2017 Hyundai Sonata 🔎.

This car is becoming more of a headache than it’s worth. Turned the car on, my car started shaking and my check engine light came on. Then I got this message “a possible condition with your engine control system has been detected on a 2017 Hyundai Sonata”.

Component/system failed: engine – connecting rod bearing failure consistent with Hyundai theta ii engine defect subject to federal recalls and consent orders. The vehicle previously received recall campaign 953 (ksds software update), intended to detect premature rod bearing wear. The engine is currently knocking and has been diagnosed as requiring replacement. The vehicle and engine are available for inspection upon request. Safety risk: rod bearing failure can cause sudden engine seizure or stall while driving, creating a significant crash risk due to loss of power steering and braking assist. Engine failure did occurr despite prior recall software update, indicating potential recall remedy ineffectiveness. Sudden stalling in traffic placed myself and others at risk of collision. Dealer confirmation: Hyundai of north charleston confirmed through warranty history a prior engine replacement request (PA) was submitted by a previous owner but denied. The recall repair was never performed. Current diagnostic findings indicate engine failure consistent with known recall defect. However, Hyundai has refused to perform further inspection or goodwill repair solely due to the vehicle’s salvage branding. Inspection history: the vehicle has been inspected by a Hyundai dealership. No engine replacement was completed. Hyundai customer care has updated case notes but is declining remedy based on title status rather than mechanical condition. Warning lamps/symptoms: the vehicle previously received ksds software update. Engine knocking developed consistent with rod bearing wear. The software did not provide effective prevention of engine failure. The engine now requires replacement. Hyundai is refusing recall-related remedy due to salvage title (predates my wonder ship by many years), despite federal recall obligations applying to the vehicle VIN. This complaint concerns potential failure of recall remedy effectiveness and denial of defect-related inspection.

Engine completely seized while driving.

The car is burning a quart of oil a week.

My 2015 Hyundai Sonata experienced service campaign tx3, TSB# 15-01-022, with an error code of p0010. My car was in the repair shop from Thursday, February 19th, until Thursday, February 26th, being repaired. This cost me roughly $2,300. 00 out of pocket. When I attempted to file for reimbursement through Hyundai, I was told they were not reimbursing me. My car experienced failure the first of February. When my mechanic investigated what had happened, it was in fact, due to the service campaign.

I had gotten an engine back in 2021 because of a recall, and now the newer engine is burning all my oil up.

See all problems of the 2014 Hyundai Sonata 🔎.

My 2011 Hyundai Sonata experienced sudden engine failure and the engine is now locked up. The vehicle became inoperable and had to be taken to a Hyundai dealership. The dealership confirmed the engine is locked and not drivable. Hyundai denied the engine replacement claim stating the vehicle has a04/a08 branding indicating the engine originates from a scrapped or rebuilt vehicle. However, Hyundai refused to provide any documentation supporting this claim. They also refused to verify the engine serial number against the VIN to confirm whether the engine is original to the vehicle. A nmvtis vehicle history report shows the title status as active with no salvage, junk, or rebuilt branding. Despite this, Hyundai continues to deny the claim without documentation. This vehicle contains the Hyundai theta ii engine that has been the subject of recalls and settlement actions related to premature engine failure. The failure pattern in this case matches the known defect where engines seize or lock up unexpectedly.

See all problems of the 2011 Hyundai Sonata 🔎.

My 2012 Hyundai Sonata recently had an engine replacement completed under a Hyundai recall. Immediately after the recall repair, the vehicle began shaking while driving, produced a burning smell, and the air conditioning stopped working, none of which occurred prior to the recall repair. These symptoms started immediately after the engine replacement, indicating a possible improper or unsafe installation. I believe the vehicle is unsafe to drive due to the burning smell and shaking. I contacted Hyundai customer service and was told the issue must be resolved with the dealership. However, the dealership has refused timely inspection, has dismissed my safety concerns, and has declined to provide a rental or loaner vehicle, leaving me without safe transportation. This is a post-recall safety issue, and I am concerned about the risk of fire or mechanical failure due to the burning smell and vehicle instability. I am requesting this issue be formally investigated.

See all problems of the 2012 Hyundai Sonata 🔎.

My 2013 Hyundai Sonata has a replacement 2. 0t theta ii engine. Recently, it developed a fuel leak that identically matches the description of Hyundai recall recall 22-01-047h (NHTSA #22v-312). I have attached a description of my fuel leak as assesed by a Hyundai dealership alongside a . Pdf of the NHTSA safety recall report to demonstrate that the issue is identical. Hyundai corporate is refusing to acknowledge that this is an identical issue and that my exact VIN group for 2013 Sonatas should be included in this recall. This issue represents a serious risk to life and property that Hyundai is refusing to officially address. They have refused to cover repairs for this issue. Additional info: my car has 124,047 miles on the odometer, but this replacement engine only has about 26,000 miles on it.

See all problems of the 2013 Hyundai Sonata 🔎.

P0471 code before 55k miles even after repair is made.

See all problems of the 2021 Hyundai Sonata 🔎.

The vehicle developed a progressive engine failure beginning in early 2024, including loud knocking noises at cold start and visible white/gray/black exhaust smoke. The condition worsened over time. In February 2026, the failure escalated to active oil discharge from the exhaust pipe while the engine was running. Oil exiting through the exhaust indicates internal engine failure (such as piston rings, cylinder walls, or valve seal failure), not an external leak. This creates a safety risk including potential loss of power while driving, risk of engine seizure, and possible fire hazard due to oil in the exhaust system. The condition has been documented on video multiple times and was shown to dealership personnel. The vehicle was taken to a Hyundai dealership for evaluation and remains available for inspection. Despite this, no written diagnostic findings or repair determination have been provided. The issue has been persistent, progressive, and reproducible, and represents a potential defect affecting engine integrity and safe operation of the vehicle.

See all problems of the 2018 Hyundai Sonata 🔎.

Hi, I recently bought my car with a savage title, the inside of the engine in my 2013 Hyundai Sonata is making a knocking noise, it has the engine light on and when I scanned it, it shows code p1326, I did some research and found out that Hyundai issued a safety recall 162 back in 2017. In the Hyundai recall webpage records it shows the recall as complete on 8/7/2020. However the engine is making the knocking noise. I took the car to the dealer (oxmoor Hyundai in louisville) to have it checked for that safety recall on 2/2/2026 and it was not checked until 2/12/2026 and they told me that they applied for an engine replacement that day, then on 2/18/2026 dealer reached out to me saying that my engine replacement was approved and that they were waiting for the engine to be delivered between 5 to 7 business days. Then on 2/19/2026 I received a call from the dealer and they told me that the engine replacement was not approved due to the title being savage, I asked why was that if it was a safety recall and she responded back saying that it was not a safety recall, it was just an extended warranty, I asked for more explanations on why if it was already approved why did it change the next day and they told me that I had to call the Hyundai customer service. I called the Hyundai customer service line on 2/20/2026 and they told me that they were going to reach out to the dealer about this issue. I haven't had any updates after that.

I have noticed puddles under/near rear side door/tire, the smell of gas after filling up tank. And a reduced mpg lower than normal with same driving habits.

See all problems of the 2022 Hyundai Sonata 🔎.

Unknown what system failed. The vehicle is at an impound lot and can be inspected on request. Police and fire department were on the scene. Police did provide a report # , and fire department provided a fire rescue case number. Safety of driver was put at risk due to the fire and potential for burning or even death. Other drivers could have been at risk if traffic had not allowed for quick movement to side of the road. No warning lamps had been on prior to the drive and none prior to fire. First indication was a burning smell while driving. As pulling over, another driver honked to alert to fire he could see from rear of CA,. Before I noticed the flames. Upon getting out of car first flames I saw appeared to be coming from under passenger side of car. The fire department arrived about 15 minutes after pulling to side of the road. The car was fully engulfed in flames. They then extinguished the fire. Police saw vehicle and insurance will examine. Apparently this is a known issue in Hyundai of which this vehicle had no open recalls pertaining to such.

My 2016 Hyundai Sonata (2. 0t/2. 4l engine) has been experiencing loss of motive power and severe engine stumbling at stoplights, creating an unreasonable risk of a crash in traffic. The check engine light is on with dtc p0010. Upon inspection, the internal oil seal plug at the intake camshaft e-cvvt has become unseated, causing an active oil leak. This matches the exact defect and symptoms (elevated idle of 1,200–1,400 rpm and power reduction) described in Hyundai service campaign tx3 (TSB 15-01-022-1). While that campaign only applied to 2015 models, my 2016 vehicle has suffered the identical failure. I am requesting that this safety-related defect be investigated for 2016 models to prevent potential engine fires from oil leaks or accidents from sudden power loss.

See all problems of the 2016 Hyundai Sonata 🔎.

Once the car gets slowed down and reaches 20 mph of speed by applying the brake or not. It gives a sudden jerk, which causes immediate reduction in speed.

See all problems of the 2009 Hyundai Sonata 🔎.

On I believe 1/14/26, my check engine light came on. Scheduled appt. For 1/16/26 for diagnostic. Several things were wrong. I decided to come back due to not having the money at the time. Over the wked, I remembered a recall notice I received around November that I asked about in November during my oil change & was told the parts aren't in & they'd give me a call. Upon viewing the recall it seemed some things I was told on 1/16/26 could be a result of the recall. I called my service person linda on 1/20/26, she spoke to her supervisor & they informed me some of the issues seem to stem from the recall. Linda gave me the manufacturer recall contact information. I contacted them on 1/20/26. She explained there was indeed a recall, there wasn't a remedy yet, it was safe to drive & if something changes, to call back. On 1/28/26 around 5:30am I left home for work & my car all of a sudden experienced a loss of power. It wouldn't go past 30mph. I returned back home & called out of work. I called the manufacturer recall & informed them. She made an appt. To take my car in the follow day, 1/29/26. I decided to drop it off that same day, 1/28/26. I had someone follow me being I could only go 30mph on a flat road & 10mph on a slight hill. I found out my service person linda was no longer employeed there. I spoke with another employee. He said they would have to do another diagnostic. I left my car. I called the dealership on 1/29/26 for an update, they had not looked at my car. I called the manufacturer recall, they assigned a case manger to my case. Jay from the nca, called me on 1/30/26 I believe. We've communicated several times without me receiving a adequate update. He's saying the issue seems to be steamed from the recall, there is now remedy yet, & they are still investigating. I've been without a car since 1/28/26, still making payments, missing work, haven't been offered a loaner & have no idea when or if I will get my car back.

I have been dealing with issues with the turbo that cost over $3k out of pocket to get "fixed" only to have a part go bad and needed to be replaced. Now the engine is bad and needs to be replaced. The dealership is horrible at being honest and treat me as if that's not my only vehicle. I ask for a loaner car and thery never respond!!.

While driving my 2015 Hyundai Sonata, the vehicle suddenly lost power and entered limp mode. A loud engine knocking noise was present, and acceleration was severely limited, creating a safety risk in traffic. The check engine light illuminated at the time of the failure. An independent mechanic confirmed diagnostic trouble code p1326, related to the engine knock sensor detection system designed to detect early engine bearing failure. The condition occurred without warning. The vehicle is currently not being driven to prevent further damage and is available for inspection upon request. Sudden loss of power while driving poses a serious safety hazard. This appears to be a known engine defect affecting similar vehicles.

On January 21, 2026, while driving on I-495 at highway speeds (e. G. 50-60 mph) in heavy traffic, my car made a "clunk" sound and I suddently was unable to accelerate. There were no warning lamps, messages, or other symptoms prior to the failure, but immediately when it happened several warning indicators, including the check engine light, oil light, and tire pressure indicator, lit up. The electrical systems and brakes appeared to still work, but the best I could to was coast onto the nearest shoulder and call for an emergency tow. I waited on the shoulder of a busy highway, in the dark, for over an hour. My car apparently has a type of engine that is known for catastrophic failure, so I assume that is what happened. I had the car towed to a Hyundai dealership and they confirmed that the engine needs to be fully replaced.

Please see the attached paperwork and I have more if needed. I am not receiving any help from the local Hyundai dealership in which I purchased the car, and I have reached out to the main headquarter. This is the 2nd Hyundai I purchased, and I was not made aware of the oil consumption issue.

I had recall 162 - engine replacement completed in 2024 , now I have fuel leak at high pressure fuel pump, the pump that is a component of the engine has now failed which was installed during the engine replacement which can cause a major fire.

My vehicle has a documented excessive oil?consumption defect. After a 1,000?mile oil?consumption test performed by a Hyundai dealership, the engine was found to have consumed 2. 8 quarts of oil, which is far above normal and poses a safety risk. The dealer referenced TSB 23?em?008h and recommended a chamber cleaning but could not guarantee it would resolve the issue. Hyundai motor America declined to cover the repair and refused to escalate my case. This level of oil consumption is consistent with known theta ii engine defects that have led to engine seizure, stalling, and fire in other vehicles. I am reporting this as a safety concern due to the risk of sudden engine failure while driving.

While driving on the freeway, my vehicle experienced a sudden and catastrophic engine failure. The check engine light began flashing, the vehicle lost power, and I almost lost control of the car. I barely had time to pull over to the shoulder to avoid an accident. The vehicle was towed to a Hyundai dealership. The engine does not start and the engine block is cracked. Hyundai denied coverage stating that a software update (campaign 953) was not installed. Campaign 953 is only a detection update and does not repair or prevent internal engine failure. This is a serious safety issue.

The contact owns a 2011 Hyundai Sonata. The contact stated that while driving approximately 30 mph, the vehicle unexpectedly lost motive power. There was no warning light illuminated. The vehicle became inoperable and could not be restarted, and the vehicle was towed. The vehicle was towed to a dealer, where it was diagnosed with engine failure. The dealer stated that the failure was related to a previous recall associated with the VIN; however, the recall number was not provided. The dealer informed the contact that the engine needed to be replaced. The vehicle was not repaired. The contact was referred to the manufacturer for assistance. The manufacturer was notified of the failure but denied coverage for the repair and alleged that the engine failure was a result of negligence in the maintenance records. The approximate failure mileage was 183,000.

Engine started rough idling and knocking. Took to a mechanic who found metal particulate in the oil and the engine spun a bearing.

The vehicle suddenly lost power while driving on a public roadway. Immediately after, the vehicle began producing a large amount of smoke. The smoke quickly filled the cabin, making it difficult to breathe and creating an urgent safety hazard. My passenger and I had to exit the vehicle right away due to the amount of smoke. We were exposed to smoke inhalation and were stranded on the side of the road in unsafe weather conditions for over an hour while waiting for a tow truck. I later learned that the vehicle had an open recall related to engine issues; however, I was never notified of this recall. Regardless of recall status, the sudden loss of power combined with heavy smoke and potential fire risk created a dangerous situation that could have resulted in serious injury or death. I believe this issue represents a serious safety defect and fire hazard that could endanger other drivers.

While driving, vehicle slowed down abruptly and stopped. It was flashing “vehicle not safe to drive”. This happened before hen I got a new engine 2 years ago. Even with a new engine now it is happening again. I took it to Nissan moreno valley and paid $240 for diagnostic only to find out there a software update they had to do with a tablet. No work needed to be one just a software update hooked up to their system. Hyundai cooperate would not assist to over this fee. I like have crashed with this happening. The car just stops with no warning and it’s extremely dangerous how it cuts off while driving. Luckily I was on the streets not freeway.

The 2017 Hyundai Sonata has had an ongoing engine malfunction defect that is causing engine knocking, stalling, and smell and rapid depletion of oil. The continuous issues are concerning especially when the car is not driven on a regular basis as it is utilized as a second vehicle. This has been a noticeable issue for quite sometime now. I have taken the car to the Hyundai dealership on multiple occassions after notably heavy oil consumption in a short time period in between scheduled oil changes. I am told by the dealership that it is evident that the engine is rapidly processing and burning oil inappropriately from a possible manufacturing defect recall related to connecting-rod bearing failure that was issued by Hyundai for various Hyundai models. The damaged engine may stall, increasing the risk of a crash. In addition, oil may leak onto hot exhaust components, increasing the risk of fire.

I have a 2007 Hyundai Sonata se v6 3. 3l and on January 9th, 2026 I had an incident where on the road my charging system light on signifying alternator failure. I made it home, but the battery was dead which was recently purchased. After recharging the battery I conducted tests with a multimeter and have determined the alternator has failed. The alternator has accrued a coating of oil overtime that was unknown until my research into the matter of root cause. Hyundai manufactures a v6 engine family called lamba in which a version called lambda mpi g6db was introduced in 2007–2009 Hyundai santa fe (cm) and 2005–2009 Hyundai Sonata (nf) models. In 2023 Hyundai issued a recall for the 2007-2009 santa fe for a cylinder head cover oil leak repair where oil drips from the valve cover directly onto the alternator causing it to fail. I have a 2007 Hyundai Sonata 3. 3l v6 engine where the very same issue has occurred with photo evidence that has caused my alternator to fail and have tested the issue. This vehicle model was not included in the recall despite the engine being exactly the same as the recalled model, the year being the exact same as the santa fe, and the alternator in the exact placement where the oil drips into the alternator causing failure just like the santa fe recall. The santa fe recall with the same issue is documented with national highway traffic safety administration below: [xxx] Hyundai has yet to issue the same recall for the Hyundai Sonata brand of vehicles, despite the same issue occurring and a known issue with the lambda mpi g6db engine design effecting multiple models in the same way documented across multiple owners of these vehicles with various fixes suggested on youtube, reddit, and enthusiast forums for this engineering failure that causes considerable risk if the alternator fails in operation on roadways. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).

See all problems of the 2007 Hyundai Sonata 🔎.

I was driving my 2021 Hyundai Sonata at approximately 3:00 am when the vehicle suddenly began shaking and vibrating. While stopped at a traffic light, the check engine light illuminated, and the engine was shaking severely. I immediately pulled over and shut off the engine. After waiting approximately one hour, I restarted the vehicle, but it was only able to drive very slowly. The following day, the vehicle was towed to a local repair shop. Diagnostic testing showed a cylinder 3 misfire, along with evap system errors and faulty fuel injector issues. This failure occurred without warning and created a potential safety risk while driving. I am concerned this may be related to a defective fuel system.

I have taken my vehicle to a certified Hyundai dealership multiple times due to intermittent starting issues. The car will unlock remotely, and the lights and electrical components will turn on, but the engine will not start. When this happens, I press the ignition button to turn the vehicle off and then try again. Sometimes it eventually starts, but there have been several occasions when it would not start at all, forcing me to call for a tow or have the battery jumped. This issue occurs most often in cool or cold weather. I had a brand new battery installed at the dealership in July 2025, yet the problem has continued. I have been dealing with this for over a year and have even been stranded out of state in below-freezing temperatures. Each time I bring the vehicle in, the dealership states they are unable to replicate the issue while it is in their service department.

See all problems of the 2020 Hyundai Sonata 🔎.

While driving in normal traffic, the engine experienced a sudden and significant loss of power and went into a reduced-power “limp” mode. The check engine light illuminated and the vehicle stored an active p1326 diagnostic trouble code related to the engine/knock sensor detection system (ksds). Because this occurred in live traffic, the sudden power loss created an unsafe situation that increased the risk of a collision, as the vehicle could not accelerate or keep pace with surrounding vehicles. This issue appears to be directly related to Hyundai technical service bulletin 22-em-001h-1, which addresses known engine defects and p1326 activation in this model and engine. The vehicle was taken to a Hyundai dealership in west palm beach, florida for inspection, where the code was verified and documentation (including oil change records) was requested. The vehicle has approximately 89,000–90,000 miles. After the dealership inspection, I received an email from Hyundai motor America consumer affairs [xxx] ) stating: “this is Hyundai’s final position in this matter, and we are unable to offer any assistance with regard to this claim. ” I believe this position is incorrect, as the symptoms and p1326 activation align with the conditions outlined in TSB 22-em-001h-1, which Hyundai is supposed to honor when these failures occur. To my knowledge, the vehicle/component has not been inspected by police or insurance representatives. The check engine light and reduced power symptoms first appeared at the time of the incident. Information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).