I have a 2006 Chevy Cobalt 2.2L and I got a reading of P0303 which is Cylinder 3 misfire. Why could possibly be the problem?

Asked by Oct 25, 2015 at 01:00 PM about the 2006 Chevrolet Cobalt LT

Question type: Maintenance & Repair

I have replaced spark plugs, ignition coil
pack, and checked compression and fuel
injector. All are okay. What else can I
possibly test to find out what the problem

1 Answer


Good luck with this. A guy from work fought for over a year with his '07 Cobalt having the same issue. This included 3 trips to the Chevy Dealer. Everything that you mentioned was done to his car as well. The only thing that helped was a Motovac cleaning of the fuel injection system. That cured it for about 6 months. When his check engine light came back on and we got the same trouble code (P0303) he got rid of the car! You can check with your local Chevy Dealer and see if any service bulletins have been issued on this. Perhaps a reflash of the PCM might fix it. I often wondered if an engine vibration was being picked up so the computer thinks it's misfiring. HTH. -Jim

Your Answer

Chevrolet Cobalt Experts

  • #1
  • #2
  • #3
View All

Related Models For Sale

Used Honda Civic
782 Great Deals out of 69,893 listings starting at $1,350
Used Chevrolet Malibu
970 Great Deals out of 66,498 listings starting at $1,000
Used Ford Focus
793 Great Deals out of 54,717 listings starting at $1,000
Used Chevrolet Impala
546 Great Deals out of 35,121 listings starting at $1,250
Used Ford Mustang
608 Great Deals out of 36,201 listings starting at $1,800
Used Honda Accord
1,070 Great Deals out of 56,642 listings starting at $899
Used Nissan Altima
985 Great Deals out of 77,077 listings starting at $1,627
Used Toyota Corolla
778 Great Deals out of 53,447 listings starting at $999
Used Toyota Camry
986 Great Deals out of 79,768 listings starting at $1,200
Used Ford Fusion
979 Great Deals out of 68,037 listings starting at $1,900
Used Chevrolet Silverado 1500
2,239 Great Deals out of 168,207 listings starting at $995

Used Cars For Sale

Content submitted by Users is not endorsed by CarGurus, does not express the opinions of CarGurus, and should not be considered reviewed, screened, or approved by CarGurus. Please refer to CarGurus Terms of Use.