Last post on Aug 21, 2013 at 6:10 PM
You are in the Chevrolet Cobalt
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Chevrolet Cobalt, Transmission, Coupe, Sedan
Oct 26, 2011 (2:33 pm)
I have a 2008 Chevrolet Cobalt with an automatic transmission. I've had it for about a month and a half. There are around 79k miles on it. I have taken it to the dealership numerous times regarding a problem that I first thought was an intermittent shifting problem. The first time, they replaced and reprogrammed the transmission control module, yet I still have had the problem.
Sometimes it just feels kind of jerky when it shifts, like it's shifting hard. Other times, like the other day for instance, I was driving a constant speed of 50mph. About 4-5 miles into it, it just felt like my engine cut out for a split second or something, and it jerked me really hard. It scared the crap out of me, but then continued driving as if it never happened.
I got a video of the RPMS jumping while I was at a constant speed of 30mph. The mechanic said it's normal.. I KNOW it's not normal. It's something you can feel, almost like it hesitates, or its trying to downshift over and over. It's such a hard problem to explain. I'm becoming very frustrated with it.
Has anyone else had a problem like this? The dealership tried to blame it on my tires, which made no sense. They called saying the mechanics couldn't even drive it that fast because the tires were so bad and that they had told me NUMEROUS times that my tires were terrible. MY TIRES ARE LESS THAN A MONTH OLD.
They are no help!!!!
#66 of 99 Re: Anyone else? [ameliaannne]
Oct 27, 2011 (9:41 am)
I apologize for your frustrations. Have you spoke with GM Customer Assistance? Has the dealer involved Technical Assistance? If not, I would definitely recommend having a case set up. I would be happy to do so for you. You would just need to email me your complete contact information including mailing address, VIN, current mileage, involved dealer, and a description of your concerns and experience. I look forward to your response.
GM Customer Service
#67 of 99 Re: Anyone else? [ameliaannne]
Oct 27, 2011 (10:18 am)
I do have a similar sensation regarding the RPM's jumping at 30 mph -though not as harsh as you describe your symptoms. I own a 2008 HHR with Identical powertrain as a Cobalt. If the speed is locked in around 30 MPH for a couple of miles it feels like I am rocking gently in my seat while driving or as if the torque converter wants to engage. i just learned to live with it and back off on the accelerator and re-adjust my speed. Again, I've learned to live with that issue and have not taken it to the dealer.
No concerns regarding the 50MPH symptoms.
#68 of 99 Re: Anyone else? [gmcustsvc]
Oct 28, 2011 (3:19 am)
Good Morning GM Customer Service,
I have an appointment with Champion Chevrolet in Johnson City TN at .(423) 218-0328
next Sat. at 8:30am (11-05-11). I have talked with tech Mark Leonard and told him what the issue was and also that I had been talking with other Cobalt owners online that were having the same issue. Mine= 2008 Chev Cobalt, miles 62k I dont have the VIN on me right now. I told Mark that most owners have found that the issue is a TCC valve and cover problem. When the dealers go to order parts to replace it takes extra time to get parts due to new issued replacement parts being sent. Sounds like a defect and as I have found should be covered under the Powertrain Warranty. I am also emailing the GM Customer Service my info to set up a case incase the dealer states its not a problem. Terry Reece--TN
#69 of 99 Re: Anyone else? [gmcustsvc]
Oct 28, 2011 (3:28 am)
Terry V Reece / Mountainboy1aol.com
P O Box 304 Elizabethton, TN 37644
2008 Chev Cobalt / 2 dr Vin# 1G1AL18F187278900 Appointment set 11-05-11 at Champion Chevrolet-Johnson City TN (423) 218-0328 8:30am
Tech= Mark Leonard
Miles = 62k
Please help with the Flutter/Shutter Issue
#70 of 99 why does the idle fall
Oct 29, 2011 (3:18 pm)
my 2005 cobolt stall when im stopped. im at a redlight and it stalls when stopped. the idle falls below one half and it dies. sometimes when i accellerate and it goes to shift (automatic) it stalls too
#71 of 99 Re: Anyone else? [mountainboy1]
Nov 01, 2011 (6:28 am)
Good morning, Terry,
Thank you very much for the information, and please keep us updated on your progress towards resolving this concern. If you have any other questions, please feel free to email Christina.
GM Customer Service
#72 of 99 Re: Anyone else? [rdesantis]
Nov 01, 2011 (8:03 am)
If you were to bring your HHR to the dealer, just know that Customer Assistance is available to you. Email Christina with your information!
GM Customer Service
#73 of 99 stalling and lights burn out
Nov 01, 2011 (7:06 pm)
not only does my 2005 cobolt stall frequently but the headlights and turnsignal lights burn out constantly. my mechanic says there is an electrical problem but he can't pin point it...any ideas. my new bulbs last from a week to a day.
#74 of 99 Test for Transmission Shudder Problems
Nov 25, 2011 (12:41 pm)
The Torque Converter Clutch [TCC] "Lock-up" sequence can cause problems, to test if the TCC is the problem try this.
1. Fully warm the vehicle and enter the time the shudder occurs.
2. Without releasing the gas pedal, engage the brakes lightly, this will dis-engage the TCC
3. IF the shudder stops, a THEN re-occurs upon releasing the brake pedal, the TCC is at fault.
Cause, "generally" the fit between the Torque Converter shaft and the bearing in the transmission is too wide, often a torque converter fixes the issue, other times it takes BOTH the bearing and the torque converter to remedy the situation.
Early TCC engagements had ONE lock-up speed, this resulted in "hunting" or continuous locking and unlocking of the TCC , newer vehicles have spread the speed of the lock and unlock by several MPH to avoid this.
"INDUSTRY" has an average memory of Seven years before making the same mistake again.
Perhaps the computer on the Cobalt is set too close on this action.
Otherwise the valve body may cause the transmission to shift up and down erratically.
A competent aftermarket Transmission shop can usually correct these issues by changing spring pressures or drilling out fluid passage restrictions.
Look for a High Performance Transmission Shop for this issue.
Another route is to contact GM Customer Service.
Even if a vehicle is OUT-OF-WARRANTY, problems specific to a vehicle are often fixed for free.
Ask your Parts Man for TSB's regarding your vehicle, this may incur a small cost, otherwise look in the back of your owners manual for Service Manuals / TSB's [Technical Service Bulletins]
When asking the parts man for a favor, always bring a bag of Apples or Donuts for bribery
Here's GM's contact info if the former provides no joy.
GM General Motors Corporate Office Headquarters HQ
300 Renaissance Center
Detroit, MI United States
GM Corporate Phone Number: 1-313-556-5000
GM Mailing Address
P.O. Box 33170
Detroit, MI 48232-5170
40yr + Wrench