2017 Hyundai Elantra GT: check engine light

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 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 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 Aug 16, 2021 · Engine · CA

I am the second owner of a 2017 Hyundai Elantra GT hatchback. I have not had any issues with the car until last week. I was driving in town to pick something up and the engine started knocking and losing power. The rpms would go up but I could not go anywhere. Eventually I had to park the car and have it towed to my house. I checked the oil and it was very low and had sludge in the upper engine area. I could visually see sludge where you fill the oil. I received no low oil light or engine light. Car still starts but has severe knock and shaking. Called into the Dealership, its over 60k (68k total miles) so they said it is over warranty but to bring in and they will call it into Hyundai. There is a 30 day wait so their must be something going on with these engines. I am seeing this same issue online with same cars.

Filed Apr 5, 2021 · Engine · 67,000 miles · FL

While driving on the highway there was a mechanical noise that came from the engine - the entire motor block gradually began to shake more and more, the engine light came on, and within 30 minutes the entire car died - would not start. Had to have it towed and reviewed my mechanic. Misfires on cylinder 3, and a spark plug was pulled and noticed that the gap was closed - something in the engine had hit the plug to close the gap. Massive amount of engine knock. Car only has 67k miles on it.