2017 Hyundai Sonata Engine Problems

Burns through oil Oil will be black and barely any on the dip stick Cannot make it to recommended oil change miles or date Goes into limp mode

Care recently became inoperable. The engine was knocking, then stalling and then inoperable. Checked Hyundai website to find Engine Recall describing exactly what my Hyundai was/is experiencing. I brought vehicle to Clay Cooley dealership (39444 Lyndon B Johnson Fwy, 75232) and explained that I see the recall on the Hyundai website describing what my vehicle is experiencing. After their service mechanics review, the Service Department Representative falsely accusing me of the engine failure, stating that I "must not have changed my oil regularly". According to the service department, my 2017 Hyundai Sonata (132,000 miles) is not covered in the engine recall, and I must pay $4,926.53 for the repair. cc: FTC - ReportFraud.ftc.gov Texas Attorney General - Consumer-Protection/file-consumer-complaint

See attached document for complaint.

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).

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.

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.

Cylinders in the engine are misfiring causing car to shake. Pistons in the engine are having trouble keeping the air compressed so psi to continue to decrease causing the misfire.

My 2017 Hyundai Sonata Sport Limited 2.4 has a known engine defect causing excessive oil consumption. The vehicle was at an authorized Hyundai dealership for the oil consumption test and had been approved for a new engine replacement. Prior to the repair, I completed $2,300 in maintenance, specifically an oil combustion cleaning and spark plug replacement, which the dealership said was required to perform the oil consumption test. While the vehicle was in the dealership’s custody, it caught fire on 12/19/2025 at World Hyundai Matteson. No one was injured, but the car was destroyed. This occurred while the vehicle was under warranty repair, creating a serious safety risk. I am submitting this complaint to document the fire and the associated safety issue with this engine defect.

Manufacturer has refused engine replacement under federal KSDS recall settlement without providing causation proof. Owner has maintenance records. Request NHTSA compliance review.

Manufacturer is refusing recall engine replacement alleging neglect without proof of causation. Vehicle has documented maintenance. Denial appears improper under recall compliance law.

My car is blowing a large amount of white smoke due to the head gasket being cracked, I was quoted 2 grand to fix it. The car is not old enough to need a new head gasket, this is completely due to how the car manufactured and I have seen many other reports of this, there should be a recall and this should be fixed free of charge.

The contact owns a 2017 Hyundai Sonata. The contact stated that the vehicle had experienced excessive oil consumption, caused by engine rod bearing failure. The engine rod bearing failure caused excessive oil consumption and premature spark plug fouling, requiring the frequent replacement of the spark plugs. The dealer was notified of the failure. The vehicle was not repaired. The manufacturer was notified of the failure. The failure mileage was approximately 132,000.

I am filing a complaint regarding Hyundai Motor America’s handling of my engine-related safety issue, buyback process, and rental reimbursement. My vehicle was towed to Elder Hyundai for a suspected engine failure. Elder Hyundai informed me that my car was covered under an engine recall campaign and that they would submit a request for free repair. Shortly afterward, Hyundai Motor America notified me that they would not perform the repair and that I was being forced into the buyback process under a Settlement Agreement Release (SAR). Elder Hyundai refused to provide me a loaner vehicle because I was not proceeding with repairs, despite the issue being part of an engine recall. They also refused to give me the repair order report for my records and refused to let me retrieve my personal items from my vehicle unless I paid a diagnostic fee. Hyundai Motor America told me I was covered under them for this fee, yet Elder Hyundai still refused. Regarding transportation, I was initially told Hyundai does not reimburse Turo rentals due to concerns about “fake receipts.” Because of my budget and age, Turo was the only rental option I could afford. After escalating, a supervisor approved reimbursement for my Turo rentals, but as of today I have not received any reimbursement. I am a school teacher with a two-hour commute each day and I have [XXX] twin toddlers. I had to use rent and bill money to pay for the rentals based on assurances that reimbursement would be processed within a week. I submitted all receipts, but my new case manager claims he has no record of them, further delaying reimbursement. I completed and returned all SAR buyback documents on November 15th, yet I have received no update on payment or processing. This entire ordeal has put me at financial risk, including potential job loss and housing instability. Hyundai’s delays and mishandling of this safety-related case have severely impacted my livelihood. I ask that you please review HMA’s action INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

While driving my 2017 Hyundai Sonata, the engine suddenly began making a loud knocking noise and the vehicle entered "limp mode" The check engine light was blinking, I took the car to a very close autozone and the check engine light came on with code P1326 (pricture upload files), which is directly related to the known KSDS connecting rod bearing defect. This issue is part of Hyundai’s safety recalls and engine warranty extensions. After that, I called Hyundai directly (reference number for that call #XXX). A kind young woman informed me that my car had been through "Service Campaign 953" and successfully completed a "Knock Sensor Detection System (KSDS) Software Update." Thanks to this, she explained that my car is under the "Hyundai TXXI warranty" and that, given the noise I was hearing along with the "P1326" code, it was very likely that my car qualified for a free engine replacement. She then scheduled an appointment for me at the nearest Hyundai dealership for the following morning. After more than two weeks of inspection, the dealer confirmed that the engine has internal damage and needs a complete replacement due to rod bearing failure. This is the exact defect addressed in Hyundai’s safety campaigns. However, Hyundai Corporate is refusing to cover the engine replacement because the vehicle exceeded its mileage limit, even though the engine failure is clearly caused by the known safety-related defect. The dealer acknowledged the problem and documented everything, but Hyundai is denying proper safety recall-related coverage. This puts my safety and the safety of others at risk, the vehicle is currently disabled and undrivable at the dealership due to the defect. Hyundai is only offering a buyback or a small cash settlement instead of performing the necessary safety repair. I am filing this complaint for many reasons but mainly because the refusal to replace the defective engine, despite the recall-related code P1326 and confirmed bearing failure. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

I am the original owner of a 2017 Hyundai Sonata with the oil consumption defect Hyundai is well aware of. For years I have been adding a quart of oil every thousand miles and had my spark plugs replaced three times in two years now. Why am I not included in the recall so I can have the repairs done free of charge? The dealer wanted me to start having them monitor my oil consumption first which will cost me around seven hundred dollars for something they already know is defective. I submitted repair bills for the spark plugs to Hyundai around a year ago, but they would not reimburse. This is a safety issue as car starts to run badly with fouled plugs.

I have just purchased this vehicle from Jones Nissan in Savannah, TN September 27, 2025 for my daughter's 18th birthday. I was told the car passed all inspections etc and was sold the car same day. We checked the oil before leaving and oil was good. Within 45 miles we came home and my husband checked the car and the oil was down half quart. We didn't think anything of it and he did complete oil change. Last night my daughter comes in and my husband checks her oil almost 3 quarts low. There are no leaks nothing we can find. This is absolutely absurd this was a car for my 18-yr old daughter to go to college and back. There are no lights that come on to tell you it is low or nothing. This is completely uncalled for and Hyundai needs to replace or correct this issue. This could cause her to be stranded or hurt if this motor was to lock up.

My car is needing an oil change almost every 3 weeks at this point. Mechanics say there is no leak and there may be a recall for GDI engines that are burning oil very fast. This is a reoccurring problem and would love to find out if I can get this recalled like I seen other 2017 Hyundai Sonatas.

We bought the car 9/27 was told the car past the dealer inspections. The cars oil was checked and i am sure it was changed and all prior to us. We drove it home and she has drove it to school. On 10/15 my husband did a routine oil check and it was over 2 qts low. He did a complete oil change and changed the pcv valve and as of yesterday it has used another 1 gt. This car was just bought 8900 and now i am assuming it needs rebuilt or new engine. I would like for this to be reimbursed. This is outrageous. When we reported the prob it had 149000 miles on it and Hydunai gives to 150000. I need this issue to be fixed

I Purchased my 2017 from Hyundai motors of America in 2017. I am the only owner. I Took the care in for a recall for Campaign 953: ECM & CLUSTER UPDATE-ENGINE MONITORING LOGIC PRODUCT IMPROVEMENT to have a a knock sensor placed on the engine to monitor the vehicle for signs of engine failure in 2022. The car has been showing signs of engine failure since the knock sensor was placed on the vehicle and Hyundai claimed that the knock sensor was bad and replaced in. Last week while I was driving the car ok the interstate at 70 miles per hour, the engine stopped running completely while driving. The check engine light did not illuminate until after the vehicle’s engine stopped running. The vehicle lost its ability to accelerate while driving. I was almost hit by a semi as I tried to guide the disabled vehicle to the emergency lane. I took the vehicle to one of the Hyundai dealerships for an inspection. The inspection shows engine failure due to internal failure. The knock sensor from campaign 953 failed to detect any engine problems. I Called hyundai motors of America and was given a case number (41539529). Even though the dealer reported to Hyundai motors of America about the engine failure, Hyundai motors of America is refusing to fix the vehicle due to mileage even though there is an extended warranty through campaign 953. This company is a fraud!! The company wants me to pre-approve authorization payment for them to replace my engine at my expense regardless of the recall, and their negligence!! They are placing people lives at risk.

The contact owns a 2017 Hyundai Sonata. The contact stated that while operating the vehicle, there was an abnormal knocking sound coming from the engine compartment with the check engine warning light remaining illuminated. The vehicle was taken to the local mechanic who discovered that there was no oil in the engine, even though the contact had recently added oil. The cause of the failure was not yet determined, and the vehicle was not yet repaired. The manufacturer and local dealer were notified of the failures. The failure mileage was 109,000.