2017 Hyundai Sonata other reported problems

UNKNOWN OR OTHER

My engine seemed to be consuming oil way to much I had to do a oil change at 61,000 recommend by tire plus but at 58,000 is when I had to change my oil I also noticed there is a buring smell and its also been leaking oil at times I went to get it checked out by a mechanic at tireplus but they also they are seeing that the oil consumption was not normal and they recommend a possible recall for it because it hazardous for how fast its consuming and the leaks

NHTSA complaint #11748628 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

I am writing to report a serious, premature failure of a primary emissions and safety-related component (the catalytic converter) that has occurred as a direct consequence of a known, unaddressed manufacturing defect in Hyundai's Theta II engine. My vehicle has a documented history of excessive engine oil consumption. This inherent manufacturing flaw causes the engine to burn motor oil at an extreme rate, forcing unburned oil directly into the exhaust system. Over time, this oil has fouled and destroyed the catalytic converter substrate, triggering trouble code P0420 and causing a complete component failure. A dealership inspection at Heritage Hyundai Towson (RO #XXX) confirmed "excessive wear" and failure of the catalytic converter. Because the catalytic converter is failing prematurely due to a liquid defect (excessive oil burning) rather than standard wear and tear, it poses an environmental hazard, compromises vehicle emissions control, and can lead to sudden engine stalling or reduced power while driving, presenting an active safety risk. Hyundai Motor America (Case #XXX) has formally denied assistance to rectify this consequential damage, despite full awareness of the underlying engine defect. I request that NHTSA investigate how Hyundai’s ongoing oil consumption manufacturing issues are causing cascading safety and emissions component failures in these vehicles. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11740602 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

I have a Hyundai Sonata 2017 one year after I bought the car I started having acceleration problems. I have had the throttle changed and the valve gasket cover repaired. On April 15, 2026 the check engine light came on. On April 29th I got theta 2 emissions update installed at Hyundai Auburn, Al. I took it too auto zone the same day the code P1326 was showing up and P0014. On May 5th my car entered limp mode for excessive oil leakage, I got an oil change April 6, 2026. My car has never done that until the update was installed. I get my oil changed every 6 months and also have sent them records. They denied my claim due to lack of maintenance.

NHTSA complaint #11738867 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

Sun roof flew off while driving, the metal framing was twisted and dent. Sun Roof was closed at the time. Pictures were sent to insurance company but no one has looked at it yet. No warning. Sun roof was working properly.

NHTSA complaint #11720516 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

Here is your updated review with that included: ⸻ I am very disappointed with Hyundai Motor America and the service I received at Hyundai of Renton. I own a 2017 Hyundai Sonata and received a letter about a required software update and ignition cylinder protector due to known theft issues. I went to the Renton dealer for the recall service. They performed the software update and were supposed to install the ignition cylinder protector. Unfortunately, my car was later stolen because of this exact issue. The ignition was damaged during the theft, and I had to replace it myself just so I could drive the car. When I returned to the dealer, they refused to install the ignition cylinder protector, saying the ignition was broken. It was broken because of the theft — which happened due to Hyundai’s known defect. After the recall software update, my key fob also stopped working properly. I went back to the dealership, and they refused to fix or properly reprogram my key fob. On top of that, the service manager, John, was very rude and unprofessional. This has been the worst experience I’ve had with a vehicle and a dealership. Because of this situation. Very disappointed.

NHTSA complaint #11719428 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

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”

NHTSA complaint #11716294 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

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.

NHTSA complaint #11711950 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

The vehicle’s dashboard continuously displays a “hood open” warning even though the hood is fully closed and securely latched. The hood has been physically inspected and confirmed to be closed, yet the warning persists. The issue appears to be related to a faulty hood latch sensor or switch, which is part of the hood latch assembly. The warning is inaccurate and does not reflect the actual condition of the hood. I am requesting that NHTSA review this issue for potential investigation, as it may represent a defect in the hood latch sensor system on the 2017 Hyundai Sonata that could affect multiple vehicles and pose a safety risk.

NHTSA complaint #11708495 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

My 2017 Hyundai Sonata SE is experiencing symptoms consistent with connecting rod bearing failure covered under Hyundai’s KSDS extended warranty program. June 22, 2019: KSDS software (Campaign 953) installed, qualifying the vehicle for Hyundai’s 15-year/150,000-mile warranty coverage for bearing failures. August 2022: Campaign 208 engine recall performed. Hyundai’s record shows Aug 15, 2022, while Wright Way Hyundai’s service history shows Aug 13, 2022 (discrepancy unresolved). March 2025 (100,238 miles): Vehicle went into limp mode with tailpipe smoke and loss of power. It was towed to Wright Way Hyundai, which kept it for several days but returned it with “no issue found.” The smoke continued. June 5, 2025 (103,996 miles): Oil change performed. August 27, 2025: Oil light illuminated, dipstick showed no oil. Vehicle now exhibits severe drivability issues consistent with bearing damage. Hyundai has incorrectly tried to reframe this as an oil-consumption issue and directed me to pay $600 for a combustion chamber cleaning. My issue is not oil consumption — it is a bearing-related failure already covered by warranty. Hyundai’s obligations include a no-cost inspection/diagnosis for connecting rod bearing failure, yet I have been denied that process. Despite repeated written requests, Hyundai continues to attempt phone communication instead of email, even addressing me by the wrong name in correspondence, which suggests reliance on standardized or generic responses. I have exclusively maintained the vehicle at Wright Way Hyundai, following Hyundai’s service schedule. I am resorting to filing this complaint because after weeks of email correspondence, Hyundai’s corporate agent refuses to help and the manager insists on only calling by phone — which I will not answer out of concern they will attempt to mischaracterize or dismiss my complaint verbally. This failure poses a safety risk because the vehicle has lost power suddenly and requiring restart.

NHTSA complaint #11688145 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

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.

NHTSA complaint #11686681 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

My Hyundai consumes oil and I have to put oil in it every two weeks! Also my ignition coils has had to be changed 4 times. Also check engine light just came on code saying catalytic converter or oxygen sensor changed oxygen sensor a couple months ago. I purchased it brand new and as soon as I got over 100,000 miles nothing has been going good since then please help also my paint on the top of the car is starting to peel. Will never buy a Hyundai again.

NHTSA complaint #11677661 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

1.Sunroof disengaged from car. yes 2. Glass falling from car. Glass could have landed inside car, killing or injuring driver. Glass could have landed on any car behind the sonata killing or injuring occupants in that car. 3. Unknown 4. No 5. No

NHTSA complaint #11674228 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

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

NHTSA complaint #11673236 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

Steering wheel warning light comes on traction control light comes on. Steering becomes difficult

NHTSA complaint #11671367 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

My car is burning a lot of oil to the point I have no oil in my car and that’s bad

NHTSA complaint #11662934 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

Paint peeling on hood and roof

NHTSA complaint #11650847 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

My vehicle was purchased in 2018 and currently has 128,000 miles. I took it to the dealership because it was puttering and not holding pil. The dealership did some work on the vehicle. Furthermore, after that trip to the dealership, my car kept burning oil even after recent oil changes that I found myself constantly adding oil. I took it to another licensed mechanic who informed me after a tune up that my car is consistently burning oil. This was after I had a recent oil change. The engine is defective, hyundai knows they are defective and refuse to do anything about it.

NHTSA complaint #11647368 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

I can’t drive my car on the highway cause then it will shut off and say HEV system error and I have to shut my car off turn it back on then erase the code with my diagnostic tool. My oil light keeps popping up and whenever I slightly press on the gas pedal or go up a steep hill, it starts to rattle, been noticing my oil burns out fast and I have to replace it when it gets low.

NHTSA complaint #11635989 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

Hello! I bought a car in the USA, I live in another country. Errors that appear in the car are similar to these: [XXX] Еrror appears then, the cogd I give more gas and let go of the pedal. When the engine is heated at different speeds. The scanner showed these errors: P1326 Ignition Control Module - Combustion Quality Input Signal; U0293 Lost Communication With Hybrid Powertrain Control Module; U1004; B2AAA. But the electricians do not know what the reason is and no one can help. So I go for one year with an error ((( Please help! INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

NHTSA complaint #11635442 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

The makes a weird shutter noise when accelerating and won't crank over 60. Loses power when turning or when going uphill. Sometimes has problem starting. Enging light came on twice blinking, once I changed the battery it went off and was working fine. Now it's back on again after a few weeks. Plus my oil tank still comes on and I've just received and oil change. I just bought the car in August of this year, dealership sold to me with a faulty battery.

NHTSA complaint #11631925 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

Driving home car just shut off still had power to steer and brake but no engine. Pulled it off the main road and it leaked oil but still no engine. Already had the dealer replace the intake manifold at my expense despite hyundai knowing the plastic lever inside fails. We were lucky the snowplow was going the opposite direction as the weather was horrible as we got closer to home. I have a dead car in my yard waiting to have a dealer look at it. We could have been killed due to fault of engine.

NHTSA complaint #11631893 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

My trunk will not unlatch and open. Trunk opening buttons are functional, however the trunk will not open

NHTSA complaint #11629113 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

The vehicle itself shakes when accelerating and will start to fail once 60mph is hit. It will also cut out when left turns are made...I have met 4 people with the exact same issues who received recalls but I am not sure why my car is not included. I was almost rear ended on the highway by a semi with my pregnant wife and 4 year old son in the car because of the engine failure.

NHTSA complaint #11613460 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

My car has cut off in the middle of the highway and street. I feel vibration under my seat and I was unable to start my vehicle. Hyundai repaired my engine and I am still having the same issues. The car feels like it’s slowing down before is completely stops.

NHTSA complaint #11593267 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

Key is stuck in ignition and won't come out. Key comes out maybe a half inch but won't turn either way. Steering wheel is not in locked position.

NHTSA complaint #11589424 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

On 03/16/2024; while driving on I-90 the vehicle at approx 60-65 miles per hr, suddenly stopped, and had to be towed to Matthews Hyundai of Schenectady.

NHTSA complaint #11577958 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

Shark fin antenna came off

NHTSA complaint #11565126 — an unverified report by a vehicle owner.

UNKNOWN OR OTHER

HEV lights came on stalled car and stated to turn engine off, barely made to a parking lot. Car was towed, in shop Dec 29, 2022 to Jan 10, 2023. knock sensor replaced, rusty spark plugs slots cleaned out, no communication with power train, case #20817405 June 16, case# 21597503 part A: Hev lights again chugging and stalling. Car towed in shop 22 days, returned 7-5-22.actuator 2nd time failure, knock sensor issue, clogged, emissions were cleaned: part b: Aug 14, to Oct 4 2023HEV system lights again, car stalled and died then towed : combustion cleaning 2nd time, spark plug corrosion replaced 2 time issue, 4 injectors replaced, recommend replace manifold (which I cannot pay for) dealer tech test drove 2 days and put 211 miles on car, more than we do in normal week driving to work and shopping In shop this time 52 days. This car has been taken in for all recall campaigns. Work done at same dealership every time. Is a sonata Hybrid SE I am attaching two files if you need more Please let me know. Your date entry below does not allow for each of the 3 times in shop total roughly 85 days four months Would like Hyundai to buy car back as no trade in value now and I cannot afford more rental fees and repairs and the balance due of $495.75 from 1st rental. Car just entering 6 year when first issue started.

NHTSA complaint #11554942 — an unverified report by a vehicle owner.