Today I got my P100D (early 2017) back from the Burlingame, CA service center with the revised 77-C parts installed on the front wheels. They had the car for a week, also did an annual service, and worked on a couple other minor (unrelated) issues.
I have been experiencing "the rattle" for the last year and half, and first started noticing it (to the best of my memory) when my car was about 6 months old (around mid-2017). I did mention the rattle during a SC visit several months ago, and they came back "it is caused by the steering rack" and the car is "functioning normally". I didn't really buy that explanation, and since then, I have been reading this thread, biding my time until it seemed like there was a solution.
My car sounds exactly like all the sample videos posted here -- that "wobbly", randomish, somewhat rattly, somewhat muted, sound/feel that seems to come from front, possibly the driver's side -- occurring most prominently over uneven pavement around 10 mph, and not really present (or at least apparent) at higher speeds. The first and last few minutes of my daily drive fit that scenario -- so needless to say my days always start and end on a slightly depressing note, for the last year and half.
Anyway, the invoice from my visit this week states that the 77-C parts were installed, and I have verified this (by looking at the stickers on the parts themselves which are now on my car).
Drum-roll please....
There is absolutely zero change in the rattle noise. The identical rattle was still there immediately upon driving away from the SC.
This despite the invoice item for the repair beginning with the description, "Driveway technician verified on a road test and recommends to update the front air springs with the revised part", and ending with, "Verified noise concerns are no longer present".
These two statements in the item must have come from different people! Last week, the "driveway technician" seemed quite aware of the issue, and recognized it when I was able to clearly and obviously demo it to him (over a rough patch of road near the SC) and he even went on to describe the 77-C fix as addressing an issue where the diameter of two parts allowed "too much play" and that the revised part "had a smaller diameter" that would resolve the noise. When I asked if that SC had "already done some" of these repairs, he said yes other customers had come in for the revised parts and resolved the noise. Even though there have been mixed outcomes reported with the 77-C in this thread, I was hopeful due to the Service Bulletin from Tesla, and even more hopeful as I drove away from the SC last week. (Even though all they could give me for a loaner was a horrible ICE boat known as a Chevy Impala.)
I was so bummed on my drive home from the SC this evening. When I got the "your car is ready" call from the SC earlier today, I was so excited that the stupid rattle was going to be gone!
Now, given my outcome, I concede that I may certainly have some other kind of issue. (Although see my earlier comment about how the sound is exactly like the videos and precisely fits the descriptions given by countless others in this thread.) Or, perhaps not all 77-C parts are created equal.
Naturally, I intend to complain to the SC that the problem still isn't fixed, and point out that the "Verified noise concerns are no longer present" statement on the invoice must be some kind of mistake. For crying out loud, there is a nearby patch of road (that I drove immediately after picking up my car today) where the problem is easily reproduced (where the original driveway technician verified the problem). Why didn't they replicate that test?! I can only conclude that these "driveway technicians" and the "repair technicians" don't seem to have a very good system of communication, which is quite disappointing.
*sigh*