door locks give 3 locks sound all together?

2015 HYUNDAI SONATA
108,000 MILES • AUTOMATIC
Avatar
BHAMDOC1
  • MEMBER
  • 364 POSTS
Whenever i start the car turb it off take key out then open the door all door locks give 3 locks sound all together. No codes related at all. How am i supposed to know which is bad
Sep 10, 2026 at 10:37 AM
Advertisement
Avatar
STEVE W.
  • ✓Experienced Mechanic
  • 15,349 POSTS
Look it over close, that is a common reaction from the locks if there is a key or remote hiding inside the car to keep you from locking the keys inside. Or hook a scan tool to it and look in the BCM data and see if it shows the lock status. That might point you at something.
Sep 10, 2026 at 3:24 PM
Avatar
BHAMDOC1
  • MEMBER
  • 364 POSTS
Hmm, the car only has a key, didn't see a remote, so possible. I looked to see if there are any codes to anything, but there is none
Sep 10, 2026 at 3:25 PM
Avatar
STEVE W.
  • ✓Experienced Mechanic
  • 15,349 POSTS
If it's a transponder key check under the dash for anything like a remote start, I've seen people add those and then glue a key near the switch so they don't need to add other items. A 15 is likely to have a remote as well, auction car or ?
Sep 10, 2026 at 5:23 PM
Avatar
BHAMDOC1
  • MEMBER
  • 364 POSTS
Auction car ya. So its not possible that the actuator on driver side is acting up and hence why all respond with the same move lock unlocl?
Sep 10, 2026 at 6:00 PM
Avatar
BHAMDOC1
  • MEMBER
  • 364 POSTS
It's just a key blade similar to valet keys. Many hyundai cars come with just those cause they break or get damaged easily so only the key is left
Sep 10, 2026 at 6:03 PM
Avatar
STEVE W.
  • ✓Experienced Mechanic
  • 15,349 POSTS
Normally what you are hearing is the protection system detecting a key inside the car. What is the final position after you here the cycling? Locked or unlocked doors? Does it still do it if you get out with the key or if you manually try the lock buttons? That year car normally comes with a fob like the attached. If you only have a basic key that could be part of the issue. Does your scan tool allow you to access the BCM security section where you can add pr remove keys?
Sep 11, 2026 at 4:09 PM
Avatar
BHAMDOC1
  • MEMBER
  • 364 POSTS
Final position is always open, I got me a fob from amazon and programmed it and it works. But of course it has an blank key. but am still getting the lock/unlock behavior. I didn't try the manual key in the door, let me try that. It won't do it if I manually locked it.
Sep 11, 2026 at 4:34 PM
Avatar
STEVE W.
  • ✓Experienced Mechanic
  • 15,349 POSTS
Try the key in the door and see what it does. With them staying unlocked at the end it sounds a lot like the lockout provision is detecting a key or the RFID tag from a key in the vehicle.
Sep 12, 2026 at 1:35 AM
Join 2CarPros for free, one of the most advanced car repair communities on the internet. From first-time drivers to seasoned mechanics, everyone is welcome to reply, share details, and get better answers. You can add a temporary image or video first; uploads are limited to 20 MB.
Ask a Free Question
Repair Safety Notice: This information is for general instructional purposes only. Vehicle repair can be dangerous. Verify all information, follow manufacturer service procedures, use proper tools and safety equipment, and consult a qualified repair shop when needed.