2025 Hyundai Santa Fe: sudden loss of power

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 Jun 29, 2026 · Electrical · MD

On [XXX] after spending the day at Henson Creek Golf Course in Fort Washington, MD, I returned to my vehicle and discovered that it had completely lost all electrical power and would not start. The vehicle exhibited no warning signs prior to the failure. Believing the issue to be related to the battery, I contacted AAA for roadside assistance. AAA attempted to jump-start the vehicle, but the jump-start was unsuccessful. The vehicle was subsequently towed on May 18, 2026, to Pohanka Hyundai in Capitol Heights, MD for diagnosis and repair. After approximately nine days, the dealership advised that the battery terminals had been secured and that no additional problem could be identified. On [XXX], the exact same issue occurred again; however, this incident was significantly more dangerous because it occurred while the vehicle was being driven. While traveling during morning rush hour through a busy intersection in Northeast Washington, DC, the vehicle suddenly and completely lost power without warning while in traffic. The vehicle stalled in the middle of the intersection, creating an extremely hazardous situation. Fortunately, motorists traveling behind me were able to stop in time, and no collision occurred. However, this incident could easily have resulted in a serious crash involving injuries or fatalities. The vehicle was towed to Ourisman Hyundai in Bowie, MD, where it is currently undergoing additional diagnosis. I am extremely concerned that this vehicle has experienced two complete electrical failures within approximately one month, including one incident that occurred while driving in heavy traffic. Because the dealership was unable to identify the root cause after the first incident, I am concerned that a serious defect may exist involving the vehicle's electrical system, battery system, wiring, power distribution system, or another component affecting vehicle operation and safety. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Filed Jun 25, 2026 · Electrical · MD

On June 24, 2026, my spouse was operating our 2025 Hyundai Santa Fe when the vehicle suffered a sudden, catastrophic, and total electrical failure while actively on the roadway. The vehicle was stopped at a traffic light when all propulsion power was instantly lost, the engine shut down, and all electronic systems—including the center infotainment screens and instrument cluster—went completely dark. Safety Hazard & Entrapment Incident: Simultaneous with the total electrical failure, the vehicle's electronic door lock system malfunctioned. The rear passenger doors and rear liftgate locked completely and could not be disengaged or opened from the inside by the passengers. Due to this total power loss and lock failure, my young daughters were trapped in the rear seats. My spouse was forced to climb over the center console from the front seat into the rear cabin to manually extract our children through the front doors. The family had to abandon the disabled vehicle in live traffic and walk down the roadway to reach a safe location. This constitutes a severe safety hazard involving both sudden loss of motive power on a public road and occupant entrapment due to safety lock/latch failure during an electrical short. The vehicle has been towed to Pohanka Hyundai of Capitol Heights for inspection.

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 Feb 25, 2026 · Brakes, Electrical · PA

Vehicle experienced sudden loss of power while driving. Transmission warning and ABS warning lights appeared at the same time. The vehicle would not shift properly and began skipping and dropping gears. Smoke was visibly coming from the center underside of the vehicle near the transmission area. There was a strong burning oil or rubber smell inside and outside the vehicle. This created a serious safety risk due to loss of acceleration and potential fire hazard from smoke and burning odor. The issue has been intermittent since early ownership, including jerky shifting and hard engagement. The dealer documented dual clutch transmission communication faults and ABS faults but returned the vehicle the same day stating it was a loose ground. The problem has continued after repair. Vehicle is available for inspection. The defect involves the powertrain and related electrical systems.

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.

Filed Jan 13, 2026 · Electrical, Engine · TX

My 2025 Hyundai Santa Fe Hybrid has recurring powertrain communication failures starting at only 67 miles and continuing at 5,300 and 6,200 miles. Diagnostic trouble codes include U010100 (lost communication with engine control module) and multiple U100xxx codes related to transmission and CAN bus communication failures. These indicate loss of communication between critical control modules. The issue has happened multiple times and remains unresolved. I am concerned this could cause drivability problems, warning lights, or sudden loss of power. This appears to be a system-level defect in the vehicle’s communication network.

Filed Jul 1, 2025 · Transmission · RI

I have had issues with my dual-clutch transmission slipping gears in multiple ways while driving; most commonly while in drive and going downhill the tachometer will aggressively rev when just idling and without pressing the accelerator. Also, when trying to reverse out of a parking space on an incline or decline multiple times I have rolled forward as if in neutral and receiving no power to back the vehicle in reverse. Previously owned a 2023 sonata with similar transmission issues and blew a cylinder on the highway within a year of ownership(engine knocked out while driving about 65 and just lost power and had to pull over on side of highway. Went to dealership yesterday for regular maintenance and told them about transmission issues. They checked vehicle for any tcu updates and there were none. Test drove it and said it was driving normal. I know it’s not driving normally/safely. What can I do?