Why does the Hyundai ix35 power on but not start with one-key start?

[Howard]

There are two possible reasons why the Hyundai ix35 powers on but does not start with one-key start: 1. Remote key battery dead: First, check if the smart remote key is out of battery. If confirmed, you can press the engine one-key start button directly with the side of the key that has the lock button aligned at a right angle while the transmission is in P or N gear and the brake pedal is depressed. This will start the engine. 2. Other common situations: Poor contact inside the one-key start button or poor connection of the button plug; starter and starting circuit failure; poor contact in the body and engine grounding circuits, etc.