Stuttering Shift - Chevy Cobalt Forum / Cobalt Reviews / Cobalt SS / Cobalt Parts
Chevy Cobalt Owners Lounge General Chevy Cobalt discussion

LinkBack Thread Tools Display Modes
post #1 of 5 (permalink) Old 12-07-2008, 11:54 PM Thread Starter
Join Date: Nov 2008
Posts: 22
Stuttering Shift

So I am new to the whole Cobalt world as I just purchased a 2007 Cobalt. It has just over 11,000 miles on it and an automatic transmission. I have one question, and hopefully I will make sense. Say I am driving down the road in the final drive gear and I give the car a little gas (enough to make the car drop a gear for passing but not flooring it) the RPM's start jumping up about 500 RPM's and back down until I give it a little more gas does it finally downshift. It's as if the car wants to downshift but hasn't decided that's what it wants to do. Like I said hopefully this makes since. I am going to bring the car to dealership soon but I just wanted to see if someone here knew what this was all about before I head there. Thank you.

Last edited by CobaltDriver07; 12-07-2008 at 11:59 PM.
CobaltDriver07 is offline  
Sponsored Links
post #2 of 5 (permalink) Old 12-08-2008, 07:49 AM
Cobalt Specialist
Join Date: Nov 2007
Location: Sunshine State
Posts: 1,250
What MPH are you at when you do this?

When you have the selector in "D" the ECM and TCM are working to keep the MPG as high as possible. Until you really push the gas pedal, the tranny wants to stay in the highest gear to keep emissions low and MPG high.

Ex-Cobalt Owner
Red07SSNA is offline  
post #3 of 5 (permalink) Old 12-08-2008, 04:39 PM
Forum Regular
KTOHIO's Avatar
Join Date: May 2007
Location: Franklin, Ohio
Posts: 142
If you do a search for my posts you'll find I had the same problem with a NEW LS COBALT07'. They had the car for an entire day and even drove other Cobalts and told me there were no codes, the trans was shifting fine and not giving any faulty conditions on there scanner. They did notice the odd up/down shift when in OD and giving it just barely any gas. They said their other "NEW" Cobalts did the same thing. My problem went away on it's own. But I did have the same problem you are experiencing. Hopefully if you take it in they will find the problem ... mine went away eventually. Not sure what was wrong with it as the dealer could not find a problem with the trans on there scanner but they did feel the "shudder" between OD and D and the RPM change.


KTOHIO is offline  
post #4 of 5 (permalink) Old 12-08-2008, 05:42 PM
Join Date: Feb 2008
Location: Edmond
Posts: 869
The Cobalt transmission is still fairly primitive by today's standards. If you don't give it enough gas then it will bog and delay slightly. As far as the ECM is concerned, that slight pressure of the pedal could just be you trying to maintain speed over a hill or accelerating 40-45mph, and no reason to drop a gear. Hope that helps.

My turbo lag is your courtesy head start.
BlackBaltSS is offline  
post #5 of 5 (permalink) Old 12-09-2008, 06:15 PM Thread Starter
Join Date: Nov 2008
Posts: 22
Thanks to all who responded so quickly. Everyone's answers helped me out quit a bit, so thanks again. It all makes since about the ecm w/ the whole drive by wire. This is something new to me for sure. I kind of thought that it had something to do with the computer and throttle, I mean we are not talking about a corvette here so I am sure they didn't work ALL of the bugs out of the computer. I am going to still take it to the dealership and see if they can come up with something but I just wanted to get some opinions before I get there. Thanks a million!
CobaltDriver07 is offline  
Sponsored Links
Closed Thread

Thread Tools
Show Printable Version Show Printable Version
Email this Page Email this Page
Display Modes
Linear Mode Linear Mode

Posting Rules  
You may not post new threads
You may not post replies
You may not post attachments
You may not edit your posts

BB code is On
Smilies are On
[IMG] code is On
HTML code is Off
Trackbacks are On
Pingbacks are On
Refbacks are On

For the best viewing experience please update your browser to Google Chrome