What's that thumping sound coming from the trunk?

[Blucenturion]

It was necessary to run my battery on my three almost all the way down to reach a supercharger. Then I still had over 200 miles to get back home, during which I started hearing a loud thump coming from the back of the car. It occurred about every 10 minutes or so, far too frequently for my comfort. I drove about 30 miles yesterday and didn't hear anything. But I am wondering what caused the thumping?

 

[eprosenx]

It was necessary to run my battery on my three almost all the way down to reach a supercharger. Then I still had over 200 miles to get back home, during which I started hearing a loud thump coming from the back of the car. It occurred about every 10 minutes or so, far too frequently for my comfort. I drove about 30 miles yesterday and didn't hear anything. But I am wondering what caused the thumping?

How many times did it happen?

The 3’s have a tendency to make loud bangs during and after supercharging. It is like they have metal panels on the battery that expand and contract and snap from convex to concave.

It is extremely un-nerving but it only happens a couple of times around the time of supercharging.

Does not seem to cause any actual issue other than waking you up since it is so loud!

 

[darth_vad3r]

It was necessary to run my battery on my three almost all the way down to reach a supercharger. Then I still had over 200 miles to get back home, during which I started hearing a loud thump coming from the back of the car. It occurred about every 10 minutes or so, far too frequently for my comfort. I drove about 30 miles yesterday and didn't hear anything. But I am wondering what caused the thumping?

Maybe you forgot to let your kid out of the trunk? Model 3 doesn’t have jump seats

Seriously though. See post above. You sure it was the trunk and not the back seat? I would think the battery metal expansion thing should be between the wheel wells / axles where the battery is and not in the trunk.

 

[MichaelP90DL]

When I hear thumping in the trunk, I assume the mobster next door put some guy in my trunk. But in each case the dude was still alive. Weird.

 

[JPP]

Might be a bad vent on the pack. There is a TSB for this.

 

[Blucenturion]

How many times did it happen?

The 3’s have a tendency to make loud bangs during and after supercharging. It is like they have metal panels on the battery that expand and contract and snap from convex to concave.

It is extremely un-nerving but it only happens a couple of times around the time of supercharging.

Does not seem to cause any actual issue other than waking you up since it is so loud!

I had an intuition it may have been connected (pun) to the supercharging. And actually I imagined the exact scenario you're describing.

 

[Blucenturion]

Might be a bad vent on the pack. There is a TSB for this.

Okay, I'll get on the app and report it, see what they say. Thanks.

 

[eprosenx]

I had an intuition it may have been connected (pun) to the supercharging. And actually I imagined the exact scenario you're describing.

Yeah, my M3 I think does it once as the pack heats up, and once while it cools down. I thought I hit something the first time it did it while I was driving (and he pack was cooling down).

 

[Rottenapplr]

Ya it does that. I just went down to 11% today and I heard thump under me. Must be the battery contracting. Gonna charge up tonight.

 

[jebinc]

When I hear thumping in the trunk, I assume the mobster next door put some guy in my trunk. But in each case the dude was still alive. Weird.

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I had exactly the same first thought!

 

[BluestarE3]

When I hear thumping in the trunk, I assume the mobster next door put some guy in my trunk. But in each case the dude was still alive. Weird.

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