2017 Hyundai Elantra GT engine problems

Filed Aug 8, 2026 · Engine · KY

The Engine stalled completely at highway speeds. It was then towed to the dealership and was diagnosed with engine rod bearing failure. Hyundai is denying the warranty extension for this engine failure based on an incomplete 'Service Campaign 966' that does not appear on the federal safety agency public recall database, leaving consumers unnotified of safety-critical software updates."

Filed Jun 7, 2026 · Engine · CA

My vehicle was brought to an authorized Hyundai dealership In November 2025 to complete safety recall campaign KSDS (Campaign 966). Soon after picking up the vehicle after the dealer flashed the ECU, the vehicle went into a permanent, dangerous "limp mode" that severely limits the engine's RPMs, making it impossible to accelerate to highway speeds. The vehicle's computer displays zero OBD-II diagnostic trouble codes (no P1326 or standard fault codes). The dealership is refusing to address this issue, falsely claiming a plugged catalytic converter, despite the vehicle having passed a strict California Smog Check with perfect emissions and zero catalyst codes, just a few weeks before the update was performed, and ran perfectly normal. This recall software update has rendered my vehicle extremely unsafe to drive on public roads, and the manufacturer's authorized repair facility is refusing to remedy the electronic damage caused by the recall installation. I am trapped driving a disabled vehicle in a permanent, dangerous software loop.

Filed May 14, 2026 · Electrical, Engine · AZ

I am writing to formally log a critical safety and product reliability complaint regarding my Hyundai Elantra GT. The vehicle has suffered catastrophic engine failure characterized by severe rod knock. This failure occurred without any prior warning from the vehicle’s onboard diagnostic systems, exposing an engineering and sensor flaw that creates an immediate safety hazard.The vehicle was operating normally when it suddenly developed a distinct, heavy metallic knocking sound from the engine block, indicative of failed connecting rod bearings. Upon immediate inspection, the issue was linked to critical oil starvation or pressure drops.Crucially, the vehicle’s warning systems failed entirely to alert me to an issue:No Low Oil Pressure Warning: The dashboard oil pressure light never illuminated to warn of low pressure or critical oil level depletion.No Check Engine Light (CEL): The engine sensors failed to detect underlying mechanical distress, oil degradation, or early-stage misfires before the catastrophic failure occurred.Complete System Silence: The vehicle gave absolutely no visual or audible alerts on the instrument cluster, depriving me of the chance to pull over safely and shut off the engine to prevent total destruction.This sensor failure is an unacceptable safety risk. Total engine seizure at highway speeds can cause a sudden loss of motive power, power steering, and braking assist, endangering my life and the lives of others on the road. The failure of Hyundai’s diagnostic sensors to communicate active oil or mechanical breakdown directly directly caused this total engine loss.I request that Hyundai review this case immediately, investigate the failure of the warning systems, and provide financial remediation for the required engine replacement.I look forward to your prompt response regarding the next steps for a corporate review.

Filed Apr 3, 2026 · Engine · CA

After a Hyundai dealership installed the Knock Sensor Detection System (KSDS) update to prevent engine bearing failure and potential fires in certain Theta II, Nu, and Gamma engines, my Elantra GT is stuck in limp mode and will no longer accelerate. Since it takes my car a very long time to reach safe driving speeds, I took the car back to the dealership and they conveniently blamed the catalytic converter. I went for a ride with a California BAR associate, and he agreed that the update was causing my engine to go into limp mode, and it wasn't a symptom of a plugged CAT, but he was unable or unwilling to help me. Hyundai acknowledged that the engine does qualify for the Theta II extended warranty but will not explore that possibility until I have them replace the cat for $3,300, which we both know isn't going to solve anything. I have contacted Hyundai Corporate Customer Relations, and even the BBB, who refuses to qualify my car for their Engine Replacement class action lawsuit because the engine hasn't seized up yet, which will never happen since the update is preventing it. Even lemon law lawyers refuse to assist me because the car is too old. Since this is the only car I have, I am a nervous reck whenever I have to use it. If I press the accelerator pedal just a bit too much, the engine cuts out.

Filed Sep 6, 2024 · Engine, Transmission · 115,600 miles · CA

The contact owns a 2017 Hyundai Elantra GT. The contact stated while driving 50 MPH and depressing the accelerator pedal to gain forward momentum, the vehicle was losing motive power. The contact observed that the check engine warning light was flashing. The contact stated that the vehicle was operating in "LIMP Mode" and was able to exit the highway. The contact stopped and had the vehicle towed to a dealer. The dealer diagnosed the vehicle and retrieved DTC Code: P1326; and determined that the PCM needed to be flashed. The vehicle was repaired. The contact stated that prior to the failure, the contact had experienced a similar failure a year and a half prior. The contact stated that another dealer had performed a similar repair of flashing the PCM. The manufacturer was informed of the failure. The failure mileage was 115,600.

Filed Jan 2, 2024 · Electrical, Engine · OH

Knock Sensor and decreased internal battery No harm to me or others Yes No No, 12-23-2023 date of incident.

Filed Nov 8, 2023 · Engine, Suspension · WA

my vehicle with apparently refurbished engine was purchased certified used through carvana in 2019 & was one of the recalled vehicles from 2017 (which I was NOT informed of at them of purchase)and is exhibiting the same signs as those in the recall, loss of power at acceleration, vibrating, etc & my local dealership, Doug's Hyundai of Edmonds is refusing to service my vehicle. I don't feel safe driving further to another dealership

Filed Aug 2, 2022 · Brakes, Engine · AR

I bought a 2017 Hyundia Elantra GT on 2/14/22 for my 16 year old daughter cash $8000. The car ran good for about a month but I could smell fumes so I took the car to the dealership on 3/11/22. I had to replaced the catalytic converter with the Hyundia dealership, which cost me $2600. On 4/8/22, my 16 year old daughter was driving to work and she advised me that it was really hard to stop on the brakes. I asked her did the brake light or service light come on. She was like no, so I drove the care to see what she was talking about and it was really hard to stop on brakes. I was having to use all my weight just to stop on brakes. I was so terrified because she could have had an accident. we thought we had all the problems behind us after getting the brake booster replaced ($500). I recently found out that there was also a recall on the brake booster (recall#17V0630000). Little did we know the worst was yet to come. On 7/26/22 my daughter was on her way to work up a hill on the freeway and the car completely stopped after making a thumping/tapping noise. No check engine warning. Leaving her in a dangerous situation to be hit by oncoming traffic. Being that the car could not be moved we had to have the car towed to the closet service center. Once they conducted their diagnostic they found that the Engine needed to be replaced showing code P0326, P0014, P052A, P0506, P0300, P0301, P0303. I was told that 2014-2017 Hyundia Elantra GT 2.0 engines had a campaign and they extended the warranty to 15years 150,000 miles. I contacted Hyundia and they advised me that I needed to take the car to the dealership in order for them to run test to determine if the engine can be replaced under the campaigns extended warranty. The car made it to the dealership yesterday 8/1/22 and I was told because they are backed up with other customers with similar issues it was going to be at least 3 months before the car would be ready, IF they get the okay from Hyundia on my case. Case#20112426

Filed Jan 24, 2022 · Engine · NC

Bought my vehicle used a few months ago. Engine started knocking. Hyundai dealership told me I had a engine recall but would not fix the problem due to sludge buildup causing the engine to knock. Sludge buildup is due to manufacturing problems but Hyundai is refusing to fix.

Filed Dec 15, 2021 · Engine · 90,000 miles · NY

The contact owns a 2017 Hyundai Elantra GT. The contact stated while her husband was driving 50 MPH, he lifted his foot off the accelerator pedal and started to hear an abnormal sound. The contact stated no warning light was illuminated. The driver was able to drive to his employer's parking lot. The contact towed the vehicle to the local dealer, where it was diagnosed with needing the engine to be replaced. The vehicle was not repaired but was pending repairs. The manufacturer had been informed of the failure. The failure mileage was 90,000.