Question about 2005 Chevrolet Cobalt

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Engine light flashing

I have an 06 cobalt and the engine lightn is flashing and sounds like its not running on all cylinders and you can smell the gas that doesnt get burnt

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  • yru2slick4me Jan 18, 2009

    did you find out what was wrong with it? I do to have the same problem

  • RickJames69 Feb 10, 2009

    I just had the problem with my 2006 cobalt the other day. Got up in the morning, started the car, wouldnt start. Kept trying, got it started. Ran rough, barely moved but moved eventually up to 30-40mph down the highway to work 10 miles. Next day, Brought it in the shop. First replaced spark plugs, was only part of the problem. Still wasnt solved, then the diagnostic found the ignition coil and ignition module system failed. Sucks, 700.00 spent for that! Unreal. Only in a cobalt

  • RickJames69 Feb 10, 2009

    ignition coil and ignition module system failed. As well as spark plugs. All in all, 700.00 out the door. 2006 cobalt w/ 54,000 miles on it. Unreal!

  • Anonymous Feb 11, 2009

    I have a 2005 Chevy Cobalt sedan that I bought 2 years ago with 30,000 miles on it. I drive a lot and I'm up to almost 85,000 miles. Last night, my car wouldn't start, then when it did, the check engine light was flashing and it was shaking, running very rough. I tried driving it around the parking lot at my work and it didn't seem to be responding properly to my accelerating, and the shaking was getting worse, so I had to get it towed to the dealership 35 miles away. I'm actually very impressed, however, at how fast the dealership started working on my car. Within 15 minutes of it opening this morning, a rep was already calling me to get details about what happened and then less than an hour later they were able to figure out what went wrong. My ignition coil burnt out, causing 2 cylinders not to work properly, ruining my spark plugs, and causing a carbon build up that will need to be flused out. All together, it's going to cost me $576, which from the sounds of what other people have paid, is actually a great price. I also asked my step-father who works as a service supervisor at another dealership, and he said it was very reasonable. I'm not sure WHY it happened, but I do know that it's at least fairly straight-forward to fix, unlike other cars I've had in the past, like a 1996 Dodge Neon (awful! problems every 6 months for the last 3 years I had it).

  • Anonymous Feb 28, 2009

    i was going to get new tires for my car. well when i started it, it would not start i tried again, it started then the car started to rumble and the check engine light was flashing. the car has 73,000 miles on it. turns out it is the coil pack and the spark plugs

  • Doug-Wendy Hays Bower Mar 16, 2009

    engine light flashing sputters and tries to die .. Smell of gas. now it wont start at all

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It sounds like you have a misfire. Anytime a misfire is detected by the powertrain control module (PCM) it flashes the check engine light (CEL) on and off. Do not drive it this way because it won't take long to damage the catalytic converter. Have the diagnostic trouble code (DTC) read with a scan tool or "code reader" to see what DTC or DTCs are set. If it's a 4 cylinder, it will have a P0301 set for a cylinder # 1 misfire, a P0302 for a cyl # 2 misfire & so on. If the misfire is random (ocurring in multiple cylinders intermittently) it will have a P0300 set. Once you know which cylinder is misfiring you can check that cyl to see what the cause might be. It could be an ignition coil or spark plug failure. The # 1 cyl is always the one closest to the front of the eng or this car, the one closest to the passenger side fender.

Posted on Dec 16, 2008

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This is a old question but is obviously still a common problem with the Cobalt. I had a '06 Cobalt with 2.2 liter engine start missing, check engine light flashing, underhood smelled of unburned fuel and vehicle was very down on power. I had AutoZone scan for codes but none registered on their machine. Here's how I proceeded:

Since there are only three components in this particular system I started with the cheapest and worked my way up. I replaced the spark plugs.. this gave me no change in operation.

This left the ignition coil and the igniter module. I bought both components but installed only the ignition coil while using the old igniter module. By replacing the ignition coil I completely resolved the misfire/rough running condition and the car returned to normal operation. I returned the igniter module to the store (unopened and unused) for a full refund.

Actual cost of failed component was $94 for the ignition coil set at a local parts store. The cost for spark plugs was a additional $28 but this was not the cause of the misfire. However, the engine has 100,000 miles on it and it is time for the plugs to be replaced and I did replace them with OEM Delco iridiums which cost considerably more than traditional plugs.

So check the ignition coil if you're having rough running and flashing CEL. It's a relatively inexpensive ($100) repair for the DIY'er.

Posted on Jan 13, 2011

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There is so much it could be, we'll start at the free stuff you can try..... 1st ... are all the plug wires on ,and if so check to see if the plugs are tight. The unburned fuel may be causing the engine to come on from raw fuel in the exhaust..it may be a simple fix or it may be a more serious problem ..Let me know!

Posted on Dec 16, 2008

  • Roscoe007 Dec 16, 2008

    Also look at throttle relay valve on the engine

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Then poor some of the gas all over the engine, making sure to soak it really good

After doing this, take a match and burn that f**ker..
Mine was doing the same thing, I burned it and blamed it on Islamic jihad to my insurance. Never looked back

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