2025 Hyundai Santa Fe Hybrid

Car was unused for less than a week and upon going to use it the vehicle was dead. Jumped vehicle and next day was dead again. In researching the problem, many other Santa Fe Hybrid owners have run into this same issue. Dealership admitted many hybrids from Hyundai face this issue and recommended installing a trickle charger for when not using the vehicle for a couple days which seems ridiculous for a brand new vehicle. Likely something draining battery slowly in car

I was on a semi residential-commercial street that turns on to a freeway entrance. I was turning right and unavoidably entered the freeway when the sudden loss of power occurred. The car slowed down to about 20 mph and pressing on the gas medal didn't yield any more power. I immediately pulled over to the emergency lane upon entering freeway to let fast moving vehicles pass me on the left side. I turned off the vehicle and turned it back on. It seemed to turn on as normal so I proceeded to drive home slowly, staying on the slow right lane of the freeway driving under the speed limit until I took my exit to get to my home. All seemed ok until I turned onto residential street near my home. Again the car slowed down suddenly to 20mph and giving it more gas did not make a difference. The time difference between the first and second (recorded) incident was 25 minutes apart, having driven the vehicle only 140 total miles. The dashboard flashed a 20mph speed limit even though I never set those parameters, didn't set cruise control, and I didn't have auto stop or hold buttons engaged. The car simply slowed down to a 20mph speed limit without my input to the vehicle settings.

Car did dashboard update on 4/10/25. Had less than 4300 miles. Unable to unlock car due to dead battery. Car unlock service opened door for tow company to jump battery and advise that the new 2025 Santa Fe Hybrid battery needs to be replaced. May need other service (alternator or Hybrid battery too) but the 12v battery had been drained. Interior lights would not turn on prior to this happening.

When you stop the car , you cannot lock- unlock the car with keyfob. Nothing happens when you press these buttons on keyfob. And Media screen inside the car is still ON. But the car is OFF for sure. After few minutes only, keyfob works fine and you can lock-unlock, remote start etc. So for 5 minutes, you cannot do anything like locking the car, which is a safety hazard.

Hi Hyundai- my 2025 Santa Fe calligraphy HEV, with around 900 miles wasn’t turning on and only able to start with a jump. After parking, it was unable to maintain a charge to start up again even after driving 1-2 hours. The dealer wasn’t sure why, replaced the 12v battery first and recharged it overnight. Unfortunately it also drained. Finally diagnosed that the hybrid starter generator needed replacing. More bad news, after replacing they discovered what the service manager said was a defective relay pack of some sort had fused. And the kicker is the part is unavailable until January. I am not sure how widespread or rampant this issue is, but I am concerned there might be more or further issues identified.