wow i am so glad i found this thread.
i have had this problem for about 3 months of the 6 i have owned my sonic.
every time that i bring it to the dealer, they spray there miracle lube on it then its hush hush for a couple weeks, then it comes right on back where it left off.
now when i question my dealer, the service manager tells me it is normal and nothing wrong with it, then i politely ask him, if it is normal than why doesn't the one on the showroom floor make this click noise ? i got nothing in return so i took my car and left.
what i have done now is contacted chevy corporate and since i have had this in the shop multiple times for this they are going to open a technical service case for this and research it further.
i know and understand this does nothing to most of us but annoy us, but we pay for a good and nice car, so i want a defect free car. makes sense to me anyways.
has anyone else ever called the corporate ?