I tried running my EV3 program that requires an infrared sensor, but it didn't work. I looked at the port view on the app and I saw the infrared sensor. It was connected, the brick recognized it but had a "---" on it. I tried restarting it, but nothing seemed to work. Any suggestions?

  • 5
    Try a different input port. Try a different cable. Try a different EV3. Try a different sensor. Commented Jul 1, 2020 at 15:35
  • 1
    Thank you for the suggestions! I tired a diffrent cable and it worked! Commented Jul 1, 2020 at 18:10
  • Hmm, Nice because your cable is not short-circuited or malfunction anymore.
    – LKBricks
    Commented Aug 14, 2023 at 6:00

1 Answer 1


That occurs sometimes if the cable is not fully plugged in. Try pushing the cable in where it connects to the sensor and the brick.

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