As far as I know, the 05 gt's qualify as well. GM won't replace the steering assist motor UNLESS you are experiencing problems. You have to physically contact them, or go to a GM dealer that is aware of the issue. They will try to tell you there is no recall so if you do have to fix it, they will make you pay out of your own pocket. It is listed in their computer under something called "Special Bulletins" or something like that, where they have to search your vin for specifically for it. GM was giving me the runaround until i told them I was aware of the recall in the united states, as well as the recall on cobalts and g5's here in canada, and told them that the parts are the same in the G6. After that, he put me on hold and said "oh yes, I found it in a different screen not under recalls. Not everyone experiences this problem but it will be fixed at no cost to you" so watch out
I was experiencing problems with mine (still am since its not fixed yet). Ive owned the car for 2 years, and it just started last year. I first noticed it when I was driving and the road was slightly slanted to the left. All of a sudden the car thought i was steering that way, so it tried assisting me and I was literally driving with my steering wheel turned half a turn to the right to try and fight it. It just happens out of nowhere. I dont let any family or friends drive the car, because if this has never happened to you before, chances are youre going to go right into a curb, go off the road, or into another vehicle or pedestrian. Ive never actually had it completely lock up though. Just last week, my DIC finally displayed "Power Steering" and gave an error code C0460, which is the steering position sensor. The shop i took it to didnt want to touch it, and that was when I decided to call GM.
My car is only 5 years old with 80,000kms on it. So be careful and watch out for this problem in your g6.
Just another addition and with research ive done:
05-06 G6's with the 3.5L engine use the electric steering assist motor. Once GM was aware of issues, they went back to the hydraulic system for most of the 07's and up. This is why you will see a horsepower decrease of about 15hp (or something around that number) in their specs.