I thought I would pass this information along...
Recently I noticed some shuddering when driving my '08 G6 (3.5L V6 - 9500mi) through traffic. It usually happens at 40mph and at around 1100 RPM. (I also noticed it around 60mph while driving in the mountains, but was unable to duplicate it here on the coast.) It usually occurs when decelerating and then ever so slightly accelerating with very light pedal pressure.
Naturally, I took it down to my local dealer. They drove it for over 50 miles, noticed the issue, ran some diagnostics, couldn't find anything, and then called GM.
GM stated they are aware of the situation, and are in the process of creating a solution. No parts need to be changed/replaced. The solution will be a SOFTWARE update. Turns out this is the precise mph/rpm where from a higher gear, the computer is not sure whether to stay in gear or downshift. The technician reassured me that this does NOT damage the transmission in any way, it is merely a nuisance. Hey also mentioned that they are used to seeing this occurring on G6's with 30,000 miles or more.
They will check for the update, during the next oil change.
Just thought everyone would like to know.
Thanks,
Marvin J
Recently I noticed some shuddering when driving my '08 G6 (3.5L V6 - 9500mi) through traffic. It usually happens at 40mph and at around 1100 RPM. (I also noticed it around 60mph while driving in the mountains, but was unable to duplicate it here on the coast.) It usually occurs when decelerating and then ever so slightly accelerating with very light pedal pressure.
Naturally, I took it down to my local dealer. They drove it for over 50 miles, noticed the issue, ran some diagnostics, couldn't find anything, and then called GM.
GM stated they are aware of the situation, and are in the process of creating a solution. No parts need to be changed/replaced. The solution will be a SOFTWARE update. Turns out this is the precise mph/rpm where from a higher gear, the computer is not sure whether to stay in gear or downshift. The technician reassured me that this does NOT damage the transmission in any way, it is merely a nuisance. Hey also mentioned that they are used to seeing this occurring on G6's with 30,000 miles or more.
They will check for the update, during the next oil change.
Just thought everyone would like to know.
Thanks,
Marvin J
Comment