I got an ESC and brushless motor set for my RC car. After I finally got it to work, I put my car back together, but then when I turn on the transmitter and then the ESC, the motor emits a "beep" every 1/2 second. The ESC has a voltage cut-off, could this be the cause for the sound?

It also makes this sound, when I turn on the ESC without having the transmitter...

  • $\begingroup$ It may be voltage cutoff. It might also be the ESC connected wrong. Make sure the Signal and Ground are not swapped. $\endgroup$
    – Kevin
    Aug 30, 2021 at 21:03
  • $\begingroup$ Once I charged the battery again, it did it's little song saying that it is connected, and ready to go. It was the low voltage cutoff. I had previously connected them wrong, but the motor didn't make any noise like that... the servo also didn't work, so I just switched the connection around. $\endgroup$ Sep 7, 2021 at 15:14

1 Answer 1


This is a simple answer: Yes, it was the voltage cutoff.

I charged my batter hoping that it was the low voltage cutoff that was doing the error beeps. Once I tried it with the charged battery, it did the normal connection "song".

Like Kevin said, though, you need to make sure that the wires are connected correctly.


Your Answer

By clicking “Post Your Answer”, you agree to our terms of service and acknowledge you have read our privacy policy.

Not the answer you're looking for? Browse other questions tagged or ask your own question.