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Clicking/clunking from the rear of the vehicle

My Jan 2021 MY LR has been at the Tesla service center since Thursday as they try to diagnose a noise from the rear end. Under acceleration, braking, and cornering (so pretty much any time it’s not standing still) there is a loud clicking sound that emanates from the rear end. The first attempted solution was to replace the HV battery terminals (on the vehicle not the battery pack) which did not successfully fix the problem. So, they’re kinda back to step 1 have no idea what’s wrong, and the app shows that my car will be ready on 12/24. I’ve seen a few threads about newer builds having a clunking sound that resulted in a battery pack replacement, but haven’t seen anyone with the early 2021 builds with this issue. Anyone had a similar problem? Also, I have no idea why they thought it was a battery terminal issue; as most of you know you don’t really get to talk to the technicians just the the person who is responsible for calling with updates.
 
My vehicle has been at the Charlotte service center for a week now and they still don’t have a clue what’s going on. I have no idea what they’ve tried because Tesla’s communication practices are garbage. All I get is “these are technically advanced machines” and “intricate repairs that require complicated and extensive diagnosis” “we are working diligently”. They are now waiting for a regional technical specialist to travel in and try to find the problem. My only real concern when I purchased this vehicle was that there was only one option for service within 150 miles of my house, and I had to hope that this location was competent. So far it appears that it’s not.
Also their definition of diligence is far different than mine. The vehicle sat in a service bay unmoved for 3 of the first 4 days that they had it. For the last 3 days it’s sat outside the building until about 4PM at which time someone drives it around the lot for about 30 - 45 minutes, brings it into the service bay for another 30 - 45 minutes, and the parks it again back behind the building for the next 22 hours unmoved.
 
My vehicle has been at the Charlotte service center for a week now and they still don’t have a clue what’s going on. I have no idea what they’ve tried because Tesla’s communication practices are garbage. All I get is “these are technically advanced machines” and “intricate repairs that require complicated and extensive diagnosis” “we are working diligently”. They are now waiting for a regional technical specialist to travel in and try to find the problem. My only real concern when I purchased this vehicle was that there was only one option for service within 150 miles of my house, and I had to hope that this location was competent. So far it appears that it’s not.
Also their definition of diligence is far different than mine. The vehicle sat in a service bay unmoved for 3 of the first 4 days that they had it. For the last 3 days it’s sat outside the building until about 4PM at which time someone drives it around the lot for about 30 - 45 minutes, brings it into the service bay for another 30 - 45 minutes, and the parks it again back behind the building for the next 22 hours unmoved.
Did they give you a loaner?
 
Yes they gave me a 2016 model S; it must be a standard range because it only has about 220 miles of range. Like some others have posted in other threads I’m unable to to change it to any other mode but Chill and the top speed is limited to 85. One curious thing is the hold function while stopped. I don’t know if the S doesn’t have hold or if it’s somehow disabled. It’s really easy to roll back since an EV doesn’t have the forward bias that a gas vehicle idling does; so, even the slightest hill is a risk. At an rate I’m really appreciative of the loaner.

As for the repair; the reason the vehicle appeared to sit so long is because they removed the drive train and inspected to ensure it met specs. I assume this was a very time consuming process. Once they ruled out issues with the battery and the drive train they had to call in a regional body and frame technician. The new tech diagnosed the problem and recommend replacing the rear subframe. Obviously they don’t have that in stock so they’re returning my vehicle today, ordering the part, and I have a return trip scheduled early January to complete the work.
 

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