Fairly loud clunk coming from rear of car

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bpratt

bpratt

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I've heard this sound several times lately, sometimes a few minutes after I parked the car in my garage and sometimes after the car has sat for many hours. My Clarity is a 2018 with about 30,000 miles, 95% driven electric.
Anyone have an idea what I am hearing?
 
bpratt said:
I've heard this sound several times lately, sometimes a few minutes after I parked the car in my garage and sometimes after the car has sat for many hours. My Clarity is a 2018 with about 30,000 miles, 95% driven electric.
Anyone have an idea what I am hearing?
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Likely a relay. Do you have a smart charger? Does the sound happen if you don't plug the car in?
 
Could it be something that is heating up and then shifting as it cools (as the metal contracts)? I used to have a 2013 Chevrolet Volt that would give a loud pop from the hatch area due to this. It would happen sometimes when you were driving (not a nice distraction). One of the reasons I was glad to trade the car.
 
Could it possibly be from a slight incline in the garage floor causing the parking pawl engage when the car rolls ever so slightly?
 
Robert_Alabama said:
Could it be something that is heating up and then shifting as it cools (as the metal contracts)? I used to have a 2013 Chevrolet Volt that would give a loud pop from the hatch area due to this. It would happen sometimes when you were driving (not a nice distraction). One of the reasons I was glad to trade the car.
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That could be a possibility.
Joe17 said:
Could it possibly be from a slight incline in the garage floor causing the parking pawl engage when the car rolls ever so slightly?
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My garage floor is definitely inclined to the rear so the car always rolls back when I turn it off and release the brake. But the parking pawl is in the front as part of the engine assembly and the sound I get is in the rear.
 
bpratt said:
I've heard this sound several times lately, sometimes a few minutes after I parked the car in my garage and sometimes after the car has sat for many hours.
Click to expand...

Does the sound only occur after a few minutes or after many hours but not after, say, 30 minutes or an hour and a half? Could it be occurring at regular intervals or at the very least, more frequently than you’ve reported?

Would you describe the sound in more detail?

Do you have any interesting theories of your own?
 
Landshark said:
Does the sound only occur after a few minutes or after many hours but not after, say, 30 minutes or an hour and a half? Could it be occurring at regular intervals or at the very least, more frequently than you’ve reported?

Would you describe the sound in more detail?

Do you have any interesting theories of your own?
Click to expand...
I mostly hear the sound 10 or 15 minutes after I park the car in the garage, but I don't spend a lot of time in the garage unless I'm doing a project. I have heard the sound several times after the car has been parked for several hours and I am doing a project, so it probably does occur quite often.

The best way to describe the sound is if someone were locked inside and hit the floor of the trunk with a hammer.

I have no theories but I believe this has only been happening the last 6 months or so. The car will be 8 years old this December and I never remember hearing it for the first 7+ years.
 
The car generally make strange noises after a few minutes plugged in. I've heard mine making clicking noises and something that sounds like the fuel pump running. I believe it is related to circulating battery coolant during charging or something to do with the evap system. But I surely have not heard what you are describing. I checked the repair manual it lists troubleshooting for many sounds but nothing from the rear except for brakes.
 
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