Why does the Hyundai ix35 power on but not start with one-key start?
2 Answers
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.
Last time my Hyundai ix35 also encountered this issue: the one-button start could power on, the dashboard lit up, but the engine just wouldn't start. I thought it was a problem with the key, but there could actually be several reasons. The most common one is insufficient car battery power—although it can still power the lights, the starter motor requires a much higher current. At the time, I called a friend over to help with jumper cables, and after trying, it started successfully. Later, I replaced the battery, and everything was fine. Another possibility is that the smart key's battery is running low: the key can unlock, but with a weak signal, the anti-theft system might lock it out. I tried replacing the coin cell battery, and sure enough, it worked. You should also check if the brake pedal is pressed down—the one-button start requires simultaneously pressing the brake; if it's not pressed firmly, it won't start either. If none of these are the issue, it might be a faulty starter or poor wiring contact. In any case, don't force it to avoid damaging components. It's best to take it to a professional repair shop to check the electrical system, preventing future surprises.
