Before I start, I have read this thread and it doesn't help Toyota Highlander 2015 rattle sound at (cold) start.

For the past few months, my car started making a rattling/knocking sound (Don't exactly know what to call this sound) when the engine starts. But, it doesn't happen always and there is no specific pattern. It doesn't appear to be a starter motor problem either. Since it is random, the mechanics can't reproduce it.

I am attaching video links to three recordings where you can hear the sound easily.




Please help me understand what could be the problem.

  • Perhaps I'm having trouble on my end but none of these 3 videos seem to have an actual recording of the car starting.
    – jwh20
    Oct 5, 2022 at 12:25
  • 1
    @jwh20. must be a problem with your device. I can hear the engine start and also the rattling sound.
    – HandyHowie
    Oct 5, 2022 at 16:56
  • @jwh20 Please use headphones. Hard to notice on speakers.
    – Ali
    Oct 6, 2022 at 1:14

1 Answer 1


One possibility is a fault with the starter motor.

The front bearing of the starter may be worn, allowing the shaft and/or pinion to rattle once it disengages from the ring gear on the flywheel.

You must log in to answer this question.

Not the answer you're looking for? Browse other questions tagged .