2025 Hyundai Santa Fe engine problems

Filed Oct 14, 2026 · Engine, Transmission · CT

the ongoing safety defect affecting my leased 2025 Hyundai Santa Fe. This summarizes the facts as discussed, the danger this defect presents, and the urgent need for resolution. Summary of the Defect Since leasing the vehicle, it has intermittently and without warning decelerated to a complete stop (0 MPH) while driving, regardless of the speed at which I am traveling — including at approximately 30 MPH on local roads and at approximately 65 MPH on I-95. The specific facts of this defect are as follows: The vehicle decelerates to a full stop within approximately 5-10 seconds of the malfunction beginning, with no advance warning. After the vehicle stops, attempting to accelerate again takes approximately 30-45 seconds before the vehicle begins to move, and it does so only slowly. When this occurs, the vehicle beeps and a flashing green “OFF LIMITS” light appears. No check engine light or other diagnostic warning is triggered at any point. This has occurred approximately 25 times since I leased the vehicle. On the last three occasions I reported this, Hyundai/dealership personnel drove the vehicle and were unable to duplicate the problem. As I have repeatedly explained, the defect occurs intermittently and unpredictably, so this is not evidence the problem does not exist. The Danger This Defect Presents I want to be direct about the severity of this situation. A vehicle that decelerates to a complete stop without warning — whether on a local road or on a highway at 65 MPH — creates an immediate risk of a rear-end collision, a multi-vehicle accident, or worse. The fact that the vehicle then takes 30-45 seconds to regain even slow movement compounds this danger, particularly in moving traffic. This is not a comfort or inconvenience issue; it is a significant, stressful, and potentially deadly safety defect, both for me and for any passengers in my vehicle, as well as for other drivers on the road.

Filed Aug 28, 2026 · Acceleration, Engine · TX

While operating the vehicle, the vehicle suddenly began severely hesitating and stalling. During the incident, engine RPM surged to approximately 6,000 RPM and accelerator pedal response became abnormal. The vehicle was not responding normally to accelerator input, which significantly affected the ability to operate the vehicle safely. The vehicle subsequently recorded diagnostic trouble code P0304 – Cylinder 4 Misfire Detected. The abnormal operation of the vehicle during the incident was also captured on video. The vehicle was taken to an authorized Hyundai dealership for diagnosis. The dealership has advised that because the condition is not currently occurring and they have been unable to duplicate the problem, they may be unable to diagnose or repair the vehicle. The safety concern is not simply an illuminated check-engine light or a stored P0304 code. The concern is the combination of severe hesitation/stalling, abnormal accelerator response, and the engine surging to approximately 6,000 RPM while the vehicle was being driven. The cause of the condition has not been identified and, at the time of this complaint, the vehicle has not been repaired for the underlying problem. I am concerned that this condition could recur without warning while accelerating, entering or crossing traffic, or traveling at highway speeds. A recurrence could result in an inability to accelerate normally, unexpected vehicle behavior, loss of normal vehicle operation, or a collision. Hyundai has been notified of the issue and I have requested further technical investigation of the engine misfire as well as the transmission/TCU and electronic throttle/accelerator systems due to the high-RPM event and abnormal accelerator response. I am submitting this complaint because this appears to be a potentially serious safety-related defect and I want the federal safety agency to have a record of the incident and determine whether similar stalling, high-RPM, acceleration, transmission, or engine-misfire.

Filed Aug 5, 2026 · Electrical, Engine · OH

What component or system failed or malfunctioned, and is it available for inspection upon request? The vehicle suffers from an intermittent, total engine stalling and propulsion failure. Without warning, the engine completely shuts down while driving and automatically drops the vehicle into "Accessory (ACC) Mode". The vehicle is fully intact, operational when it restarts, and is available for immediate inspection upon request How was your safety or the safety of others put at risk? This issue has occurred five total times in live traffic, severely risking the safety of the vehicle's occupants and surrounding drivers. The most recent and dangerous incident occurred on the freeway in heavy, stop-and-go traffic. A sudden, complete loss of power on a high-speed freeway leaves the vehicle entirely vulnerable to rear-end collisions, as it leaves no room or momentum to safely coast to the shoulder. Has the problem been reproduced or confirmed by a dealer or independent service center? No. The vehicle has been brought to an authorized Hyundai dealership five separate times specifically to diagnose this exact stalling issue. Because the failure is intermittent, dealership service technicians have been unable to replicate the problem during their test drives or resolve the root cause. Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? The vehicle has been inspected five separate times by authorized Hyundai dealership technicians during the service appointments mentioned above. No police, insurance, or independent manufacturer representatives have inspected the vehicle yet, as the stalling has not yet resulted in a physical crash. Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear?There are absolutely no dashboard warning lights, check engine indicators, error messages, or mechanical symptoms prior to the failures. The engine shuts down instant

Filed Jul 10, 2026 · Electrical, Engine · IN

While driving on the on ramp to [XXX] the car completely stopped and all systems shut off. There were two dash lights that flashed quickly with one being the check engine light but I did not see the other long enough to identify it. The dealership could not reproduce the issue but has the car now and is doing a more thorough evaluation. What component or system failed or malfunctioned, and is it available for inspection upon request? The engine stopped. Yes it is available How was your safety or the safety of others put at risk? Extremely dangerous as it came to a stop in the middle of the road. It was late at night so at that moment no one was behind me. Has the problem been reproduced or confirmed by a dealer or independent service center? no Has the vehicle or component been inspected by the manufacturer, police, insurance representatives or others? no Were there any warning lamps, messages or other symptoms of the problem prior to the failure, and when did they first appear? no, the warning lights flashed on as the car died but disappeared once off. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed May 27, 2026 · Engine, Transmission · NH

The engine has 1205 miles on it and seized up. Autofair hyundia of Manchester denied us. We did get a warning light a couple days before. But to late just the dealer inspected it.

Filed May 3, 2026 · Engine, Transmission · FL

Driving down the highway. Vehicle random alerts that there is a transmission error.

Filed Apr 6, 2026 · Engine, Fuel system · UT

Vehicle exhibits delayed deceleration after releasing accelerator. Engine RPM remains elevated for several seconds, causing the vehicle to continue applying power unexpectedly. Issue began after recent repair and was not present before. Condition is intermittent but reproducible and affects drivability.

Filed Mar 30, 2026 · Engine, Fuel system · ME

Traveling in a 55 zone on Rt 27 and my vehicle lost power and said pull over and charge vehicle with engine on. I did this once and the battery went up to half way charge then I could start to drive again. Less than a half a mile up the road climbing a good size hill by the town’s salt shed—the same issue occurred. I had to pull over again and allow battery to recharge. This is not a complete hybrid, it has a gas engine not sure why the hybrid and gas are not syncing up. Many users on the internet have reported the same issue that I have experienced. Someone needs to investigate this before major injury occurs.

Filed Jan 22, 2026 · Engine, Fuel system · CA

Car had an unintended acceleration. I had been stopped prior to entering my garage. I had started to slowly accelerate when the car accelerated hard. It took a lot of effort to stop the car.

Filed Jan 21, 2026 · Engine · NC

Immediately following routine maintenance performed at an authorized Hyundai dealership, my 2025 Hyundai Hybrid Santa Fe Calligraphy experienced a complete loss of engine oil, which resulted in the engine shutting down while driving on a highway. While traveling at highway speed with my minor daughter, the oil pressure and engine warning lights illuminated, followed by multiple error messages. The vehicle rapidly lost power, and I struggled to safely maneuver it onto the shoulder while high-speed traffic was passing. This created an immediate and life-threatening safety situation, with a real risk of being struck by other vehicles. We were stranded on the roadside for over three hours awaiting a tow, exposed to ongoing traffic danger. The dealership later advised that the incident was caused by a faulty Hyundai-supplied part, not driver error, misuse, or lack of maintenance. The vehicle had only approximately 4,000 miles at the time of failure. A sudden engine shutdown due to oil loss at highway speeds presents a severe risk of collision, injury, or death, especially when it occurs without warning. Given that a Hyundai component is implicated, I am concerned this may represent a broader safety defect affecting other vehicles. This incident caused extreme distress and endangered both myself and my child. I am submitting this complaint so that the federal safety agency may evaluate whether this issue warrants regulatory review or further investigation.