From Post #171 in the Add Cruise Control? thread:
"Gentlemen... I hang my head in shame for the tardiness of my reply. It has been a long week and the end results were disappointing to say the least. Definitely a bad news vs. do -you-feel-like-gambling/slim chances for good news scenario. Here goes...
Received a call back last Tuesday from the salesman, not the service manager, who initially stated VERY flatly that on 2012 models a factory retrofit at a dealership was impossible to do. My options were to either live with it as it was optioned or I could have him cancel the sale and wash my hand of the entire affair. I told him I would discuss it with my wife but the chances of keeping it sans cruise control were very slight.
The next day late in the morning the service manager called with pretty much the similar story but with a small carrot extended. He has done the very same refit to over a dozen Cruze models and dug deeper past the initial roadblocks the CPU was putting up. He called GM and spent 40 minutes or so with first one and then 3 engineers on the whys and why nots. Here is the upshot, at least from his research.
The Sonic with a "cruiseless" steering wheel will indeed accept only the OEM's necessary (buttons, harness, et. al) for a swap out on that existing wheel, an entire wheel switch is not needed. One other item however would be required to be exchanged completely... anyone wish to take a guess?....
The CPU in it's entirety. And all systems utilizing it could require reprogramming as well, he would not know until it was attempted. He mentioned the folks he was speaking to seemed very interested in him attempting it, but it would fall 100% on the owner or dealership to work out the cost on the attempt. They did confirm to him that a software patch for the stock CPU to allow this is being actively investigated for the future but he could get no answer as to if it was being developed or anything on a date for such a patch being even beta tested.
So if I was willing to take a risk on it he was willing to attempt it. They would not however cover any labor for possible additional reprogramming, etc... and my parts cost rose just a tad to approximately $1800 minimum, with little guarantee of success.
I am sorry to report I was unwilling to roll those dice after mulling it over until this Friday past. The salesman meanwhile spent a great deal of effort trying to locate another '12 with the cruise/connectivity package that had similar miles on it, but came up empty.
So the search goes on. Looked at Honda's yesterday late in the day and did testdrive a few Mazda's today, including a Speed3 that my wife in no uncertain terms ix-nayed without a single spoken word.
My apologies for bearing this bad news to you all. Hopefully this software patch will become a reality in the days ahead."
That would be from a Dealer. GM will not officially support.
This question has arisen from the beginning of Sonic retail sales. There has never been a different answer that I can recall, but no answer has been as detailed as the one here quoted.
Laborsmith