Cruise Control problems of the 2015 Hyundai Sonata

The contact owns a 2015 Hyundai Sonata. The contact stated while driving approximately 30 mph, the sunroof detached from the roof of the vehicle. The cause of the failure was not yet determined, and the vehicle was not yet repaired. The vehicle also experienced severe engine knocking and the vehicle was taken to the local dealer who diagnosed that the engine was faulty and needed to be replaced. The engine was replaced, and the vehicle was repaired. In addition, several safety features including the lane departure, cruise control, and the forward collision avoidance system intermittently malfunctioned. The cause of the failure was not yet determined. The manufacturer and local dealer were notified of the failure. The failure mileage was approximately 92,000.

When trying to set my cruise control a message pops up on my dash saying scc conditions not met.

Cruise control does no always engage.

1. Cruise control is jerky and rough on acceleration and deceleration 2. Main issue I have with this car is that the fuel gauge is incredibly inaccurate. If it reads at 1/8 tank, I can only put in 12-13 gallons. Each "tick" mark on the gauge value ranges from about 9 miles to 63 miles despite the fact that it regularly gets 32+ mpg combined city/highway. When I complained to the dealership (I bought it used) they replaced the vaccuum cylinder, which helped with filling the tank (it would previously just shut off mysteriously during fill-ups) but then the gas gauge measured even worse. The "range" as calculated by the car's computer is always very low and drops off precipitously even though I know (by the trip meter) that I haven't gone far enough to have used as much gas as it would appear. Despite the obvious flaws of the gauge, the codes still read that it is working "normally" and to have it covered by the warranty, I have to experience a complete failure of the fuel sending units, I. E. Catastrophic break down. I would like to have them replaced before it gets to that point.

While driving at 70 mph on the highway with adaptive cruise control operational, the vehicle failed to respond on 3 different occasions to the sudden and unexpected presence of a vehicle that unsafely moved into my traffic lane just feet ahead of my vehicle. Instead of my vehicle backing off, my vehicle was moving closer and closer to the car ahead and I had to apply the brakes in order to avoid crashing into the vehicle in front of us. It was as if the adaptive cruise control system was unable to "see" situations when confronted with vehicles that suddenly appear in front of my vehicle and are extremely close. In all other respects, that adaptive speed control system worked perfectly.

Bought 2 brand new Sonata with top technology package on 4/15/2015. The problem happened on both new cars. Whenever the gas pedal is off, the computer/software take control of slowing the car down even with open road ahead, on flat surface, on corners, up or down hill. This happened whether it is in eco, nor or pwr driving mode. At various stages, the brake kicks in at various speed and the transmission downshift prematurely; in deceleration, the rpm will only goes down until idling speed, but I can see the rpm goes up a few hundred rpm at least twice before the Sonata come to a complete stop? Sonata does not have "hill decent control" like the range rover for specific safety reasons. In cruise control, it is even worst. If you set cruise at 60, later speed up to 80 to pass a slower car, once you let off the gas pedal, the car hit the brake and slow you back to 60? what is the hurry? coasting is drivers best friend because it means free mileage. Yet Sonata engineer thinks otherwise. This erratic behavior would certainly irritate the driver behind you enough and even cause road rage. If the Sonata decided to hit the brake by itself at a fast corner, what will happened? there is an article in detroit bureau mark b, said his 2012 equus spin out of control and no one understand why? I brought back the car twice to the dealer and both the mechanic and the sale manager defend their product. Attach article from detroit bureau. . Read more...

Since leasing the vechicle on August 1 I constantly complained about the gas mileage which hyandai indicated would be resolved on the following oil change. The oil change bearly effected the mileage efficiency which leads to the second issue when the gas guage shows below a quarter on the tank the cruise control does not work and is also affected in high mountain areas. When I explained these issues to hyandai they said they never heard of it and would sent to the company for further review in the meantime I have a car with the gas guage that does not show exact amounts from fill up to empty makes this car a safety risk that is totally unacceptable not to mention the car is running horrible which suggest other safety features are not working accurately. The dealers look over only suggested other underlying issues exist with this vehicle and is a clear safety hazard.