car stalling on highway or idling , at stops..etc. on Chevrolet Cobalt

Average mileage: 101,086 (50,045–157,000)
Engine affected: 2.5L 4 Cylinder
6 model years affected: 2005, 2006, 2007, 2008, more2009, 2010
33 people reported this problem
24 people shared problem details
My car keeps shutting off every time I come to a stop or when idling and sometimes when I'm slowing the car to turn a corner. I hate it! Its really scary! Now I have to take it to a shop because I know nothing about cars and with all the different opinions I've been getting from everyone, I just don't know what the heck to think. Big bummer that's 4 sure.
Basically the rpm fluctuates when I get into semi heavy traffic, idling is a problem as well as simply slowing down. The rpm will suddenly drop Uber 1500 and although I'm pressing the gas peddle I get nothing until it jumps to 4500 rpms and will bob up and down like that. When this happens I get a clicking noise under my shifter handle as I depress the brake pedal. A seemingly erratic issue that sometimes accompanies this problem is that when I use my blinker, the dash alarm will ding until I turn it off. I've replaced everything(based on both dealer and third party mechanics recommendations) from throttle body, spark plugs, fuel filters, o2 sensor, fuel pump, had my tank dumped and flushed out, battery, as well as replacing the recalls that applied to my vehicle. The problem goes away after something is fixed but only anywhere from 2 days to 3 weeks. Making it difficult to pinpoint the problem. Please help!
Engine Stalls while idling at a Stop sign.
2006 Chevrolet Cobalt134,000
My cobalt runs great until you stop are slow down to almost a stop. It start trembling and pulsating sometimes it shut off. I changed the gas cap it did't solve the problem
2005 Chevrolet Cobalt109,000
Car stalls when the clutch is engaged while stopping when it cold outside has been happening for over two years. In December 2013 had the whole pedal with sensor and throttle body with sensor replaced. This fixed the problem until November 2014. The stalling started again and it's also gone into reduced engine power mode.
Car idle varies sometimes shuts off. Ignition switch is in run position.
2007 Chevrolet Cobalt130,000
At a idol it starts at 1000 then bounces back down to around 500-400, it does that four a few seconds then dies. Also at a complete stop or when I start to come to a complete start it dies.
The speedometer fluctuates erratically when driving or idling. One time while idling, the speedometer went to 110 miles per hour and then back to 30 then it stalled out, the car was not moving. When on the highway the speedometer acts erratically and the car keeps jerking. I don't feel it is safe to drive. I have taken it to the dealer but they replaced the ignition for the second time and the car is still doing the same thing. They say they don't know what is really wrong with it, but I have read other reviews that states similar problems. I just paid my last payment on it today after five long years I bought this car brand new and I have tried to take good care of it. I am not happy right now.
2006 Chevrolet Cobalt151,000
Every time i come to a light it idles and most of the time it shuts down...
starter died out of nowhere once that was fixed, iv had problems with it keeping at an idol while driving or sometimes shifting gears. plugs were changed since then battery too,tried different key in case chip in key was bad, still wants to cut out or hesitate. almost cut out in the middle of a intersection with kids in car. I am limited on how far I can drive this way and don't dare take it on the highway and nobody knows what the problem is to fix it.[unless you've got a lot of $ to troubleshoot what might be the problem] tried changing fuses too nothings worked & I cant keep putting $ towards a maybe.
car starts but only runs 1 to 2 seconds
My car shuts off all the time and keeps doing it after I try to turn it on!
Many problems with one solution (this is my experience with this buggy car): 1- low rpm or stall when engaged on drive with breaks on (at red light); 2- at initial acceleration, automatic trans will shift at higher RPM and car will kick - once on highway runs well; 3- computer may beep and show "power steering" message, RPM meter or speed meter may fluctuate (will real speed is not). seems to be more frequent with humidity. The dealer cannot help me with this. I found the following (ok for me 100% of times) workaround: just turn off the car for 30 sec and I'm good for many weeks. This a king a car reboot, this is probably a computer problem .... BTW did you notice the computer just in front of the gaz tank , what a bad place to put such a sensitive and critical device... First Gm in my life, the last.
2008 Chevrolet Cobalt155,000
It idols beautifully. Starts right away. It wants to die while at a traffic light while in gear. Runs great down the freeway or just idieling.
Came to a stop light and it just shut off on me as the light turned green and I went to go it just turned off. Then at stop signs it's does the same thing.
My engine light comes on give a mesage engine power reduce have it at the dealer and they have not found what the problem is almost 2 weeks please help
2005 Chevrolet Cobalt124,620
When I stop at a stop sign my car cuts off and when I'm on the highway in traffic it cuts off
2008 Chevrolet Cobalt117,000
My car is constantly shutting off when u pull up to a stop sign or just simply idling. I have replaced the throttle body and the wiring to it and followed by several sensors such as air flow crank idol control ect I don't remember then all plus it's been at the shop 4 different times. I'm clueless to what it could be any help would be appreciated
2010 Chevrolet Cobalt- 2.5L 4 Cylinder106,000
Car stalls at stops. Took to shop. They couldn't replicate problem. No fix.
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