Interesting noise when shifting

[dan765]

Hello y'all

08 Saturn Astra, 32,xxx miles.

When shifting from 1st gear to 2nd, it makes a sound that sounds like dropping a bag of tools a couple inches above the floor. The sound seems like it is coming from up above the brake and gas pedals.

Here is the interesting thing: it only does it after I turn the car on and start driving, no matter if the car is hot or cold. It doesn't do it when I'm taking off from a red light or anything. I even tried shifting into park at a red light and shifting back into drive, and it didn't do it. I guess it only does it after the car was off.

Any ideas?

 

[tcp71]

ABS self check? Happens at the beginning of every drive cycle. My sienna does it the first time you hit 20km/hr every drive cycle. Clunk you can hear and feel through brake pedal.

 

[SwampSurvivor]

Sounds like an ABS self check.

I've had vehicles that make a buzz, but my Focus would make a huge clunk the first time taking off. Don't even notice it on my subaru.

 

[demarpaint]

I learn something new everyday. I have never noticed it, ever.

 

[69GTX]

I was driving my current car for years before I finally found out what the ABS self-test was. Up to that point I just assumed it was some sort of tranmission shifting noise or "buzzing" only occurring from 1st to 2nd. When I had an ABS failure and did some research on it...then I found out about the self-check feature.