Question about 2006 Chevrolet Cobalt

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2006 chevy cobalt "reduced eng pwr" warning came on today

When driving today my car slowed down and was sputtering and a warning message came on that said "reduced eng pwr." When this happened that car would not go over 35MPH. I was able to get home and stop the car, I turned it off for a few minutes and checked the oil, it was a little low but not dry. I then started the car back up and it seemed fine, i even drove it around a little and it seemed fine but now the check engine light is on. do you know what the problem could be?


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  • johnniquest2 Jan 19, 2009

    I havw the same problem. Unplugged the emission cotrol fuse to check it then the engine started running bad again. Shut the car off, plugged the fuse back in, now it won't start at all. Someone at the parts store said it might be the theft prevention system. Is this possible?


  • alex05 Jan 30, 2009

    2006 chevy cobalt, automatic transmission first it started i couldn't take key out of ignition, it then was ok, had it checked by dealership who in turn told me it needed a 'shifter' and a new key sincr mine is just slightly bent, but then it started running fine again, this week it wouldn't start evenafter boosting with another car. also it's telling me 'engine power reduced' and it will NOT start, could someone please tell me what's wrong with it ? thank You

  • cobalt owner Feb 26, 2009

    I have had this same problem with my car. I have had it in the shop numerous times and replaced about everything except body parts... Every time something new works for about a week and then ENG PWR REDUCED..not sure where to go from here.

  • Anonymous Mar 08, 2009

    I have had the same problem with mine. I have had it in two shops and replaced about 1000.00 worth of parts. I drove it for one whole week with no problems. On my way to work today ENG PWR REDUCED again.... not sure where to go from here.

  • Rara25 May 07, 2009

    Same thing. Engine power down when I am usually going over 45 mpg. I am afraid to drive on interstate because of this. I have it sputter and die when I am sitting idle as well.



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Hey had the problem before when my car went dead. I jump it the the ENG PWR REDUCED thing came on. I shut it off. Look a the fuse under the car. Found the ecm of pcm fuse change it out then it work. had not have a problem sence.

Posted on Jun 10, 2009

  • vanessa reyes Oct 25, 2011

    where was that ecm of pcm fuse at? im having the same issuses but i dont know how to find it.


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I too had this same issue just last week. No check engine light or code would trip when it stalled and shut off. I kept it in park and kept giving it gas until it would shut off to try and pinpoint where it was coming from. Coolant fine, oil level fine. Finally I tripped the Engine Power Reduced code on the dash. Engine was knocking and shaking and kept dying at this point. Pulled the spark plugs, pretty nasty looking. Went to Advanced Auto Parts and got 4 new spark plugs for a grand total of 24 bucks. After putting it all back together and taking a test drive it drove better than it had when I first bought it. I know I see a lot of other things that have worked as well on here, but if you're stumped this could save you some big money.

Posted on Dec 04, 2012

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It is either the Oil or the Coolant.

Posted on Jan 18, 2009

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