2022 Hyundai Sonata Hybrid

The contact owns a 2022 Hyundai Sonata Hybrid. The contact stated that while attempting to use the key fob to unlock the vehicle, the vehicle failed to respond. The contact manually unlocked the vehicle with the key, and the vehicle failed to start. The contact stated that the failure had occurred on two occasions, and the vehicle was jump-started. The vehicle was taken to the dealer, where the contact was informed that the failure could not be duplicated. The vehicle was not diagnosed or repaired. The manufacturer was not notified of the failure. The failure mileage was 33,808. The VIN was not available.

Car is a Sonata Hybrid Limited equipped with a solar roof which charges the hybrid battery. Vehicle began to cut off battery power while parked, requiring the use of a factory equipped 12V override switch in March 2025 after approximately 3.5 years of ownership. This occurred multiple times, often when the car was parked in the sun but independent of how long it had been driven prior or how long it had sat without being started. Evaluated by two Hyundai dealers; second dealer found a fault in the "solar DCDC converter" as well as the hybrid battery bulging. Battery module replaced. Unclear if this resolves the issue or it will recur again. Am speaking to Hyundai regarding battery warranty extension as vehicle had 88000 miles on it at the time of the issue starting. Online fora (e.g., Reddit, Facebook) note other customers who have had similar problems with similar fixes. - [XXX] - [XXX] - [XXX] - one individual in this thread had complete power loss while driving down the highway This issue potentially risks stranding customers, and if the hybrid battery continues to bulge increases the risk of fire which could lead to property damage, personal injury, or death. INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6)

Purchased vehicle on March 5, 2025 from a dealer. At the time it had approximately 20,000 miles. Within days of purchase, the car would not start even after pushing the battery reset button. Eventually, it would restart, but the time it took was considerable. Took the car to the Hyundai dealer near me and discovered that it had been with them for two months prior to purchase for the same problem. They have replaced the 12 V battery and possibly the hybrid battery, but now after owning it for about six weeks, it is giving me a message that there is a problem with the hybrid system and I should stop driving immediately. It is now back at the dealer. They can’t seem to duplicate the problem and I don’t feel safe driving the car because I don’t know if and when I’m going to get to my destination.

My vehicle is in the shop now and will be due to 12volt battery charging system failure. I have taken the vehicle to the shop 4 times now because vehicle will not start unless you hit the reset 12volt button. The dealership told me that they were surprised that I was able to start the vehicle. I was told that it is the NHTSA Campaign # 24V868000. This vehicle is not included in this campaign number but it should be. Hyundai needs to include this make and model to the recall so other drivers don't have the same issue and so that they don't find themselves stranded.

When outside temperature drops, car starts in morning with several warning lights illuminated, indicating fault with several safety systems including airbags, brake, power steering, front camera, blind-spot collision warning system, traction control and smart cruise control. Car key fobs have consistently failed, disabling access to the vehicle. The vehicles 12V reset recently failed which required Hyundai Roadside Assistance (10/25/24). According to BlueLink application, cars 12V battery has been reset dozens of times, which is information visible to the service centers. However, at several past service appointments it has been verbally stated that "problem can not be replicated" and was not documented. Problem was confirmed by Hyundai service center on March 13, 2024. Problem was not resolved at the time of service, vehicle was returned back without resolution. With temperatures now dropping at night, said issues are occurring daily with warning indicators for failing safety systems illuminating upon cold start and electrical system failing daily.