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Thread: Check Engine Light came on: Codes P0201, P0202, P0203, P0204, P0205, P0206 & P0305

  1. #1
    Registered Member

    2012 CX9 Touring

    Join Date
    May 2018
    Location
    Bucks County, PA
    Posts
    1

    Check Engine Light came on: Codes P0201, P0202, P0203, P0204, P0205, P0206 & P0305

    Hello all, new to the board and hoping I can DIY this problem with some help!

    As the title says, I started my 2012 CX-9 Touring yesterday and the check engine light started flashing about 3 minutes into my drive. I borrowed my neighbors Actron CP9690 and the following codes were downloaded P0201, P0202, P0203, P0204, P0205, P0206 (Injector Circuit / Open Cylinder 1-6). I also had Cylinder 5 Misfire Detected P0305.

    I reset the check engine light and restarted the car. The check engine light came back on in a few seconds, car is idling roughly, and I got all P0201-P0206 codes again. I'm guessing I didn't get the P0305 because I didn't drive anywhere?

    Any suggestions what might be the issue? Thanks so much for the help!

  2. #2
    Registered Member

    2010 CX-9 GT

    Join Date
    Jan 2011
    Location
    Melbourne, FL
    Posts
    173
    Quote Originally Posted by nitsuj3580 View Post
    Hello all, new to the board and hoping I can DIY this problem with some help!

    As the title says, I started my 2012 CX-9 Touring yesterday and the check engine light started flashing about 3 minutes into my drive. I borrowed my neighbors Actron CP9690 and the following codes were downloaded P0201, P0202, P0203, P0204, P0205, P0206 (Injector Circuit / Open Cylinder 1-6). I also had Cylinder 5 Misfire Detected P0305.

    I reset the check engine light and restarted the car. The check engine light came back on in a few seconds, car is idling roughly, and I got all P0201-P0206 codes again. I'm guessing I didn't get the P0305 because I didn't drive anywhere?

    Any suggestions what might be the issue? Thanks so much for the help!
    If it were only 1 cylinder, I'd say it's probably a bad injector. Just to be sure, I'd pull a coilpack and see if the resistance is in spec.

    However, all 6 leads me to believe there is an electrical issue elsewhere. Have you had any work done to the car recently? That many codes sounds like a wiring harness is damaged, a harness connector is loose, or the ECU itself is bad. I have heard to corrosion causing issues like this as well - if water gets into an electrical connector on a wiring harness, it can cause all sorts of issues.

  3. #3
    Registered Member

    2008 Mazda CX-9 Touring FWD . 2014 CX-5 GT FWD

    Join Date
    Dec 2007
    Location
    Chicago
    Posts
    162
    Quote Originally Posted by nitsuj3580 View Post
    Hello all, new to the board and hoping I can DIY this problem with some help!

    As the title says, I started my 2012 CX-9 Touring yesterday and the check engine light started flashing about 3 minutes into my drive. I borrowed my neighbors Actron CP9690 and the following codes were downloaded P0201, P0202, P0203, P0204, P0205, P0206 (Injector Circuit / Open Cylinder 1-6). I also had Cylinder 5 Misfire Detected P0305.

    I reset the check engine light and restarted the car. The check engine light came back on in a few seconds, car is idling roughly, and I got all P0201-P0206 codes again. I'm guessing I didn't get the P0305 because I didn't drive anywhere?

    Any suggestions what might be the issue? Thanks so much for the help!
    First, stop running the engine if its idling rough and throwing misfire codes. Codes with rough idle means theres no question something is interfering with ignition, timing or both. You are likely to cause damage unless you track this down asap.

    Second, check your oil for the dreaded chocolate milk sign for a blown water pump. That can cause the codes u r seeing.

    Mileage? Plugs changed? Other recent maintenance. Too little to go on.

    Third, get the vehicle in front of a mechanic.

  4. #4
    Registered Member


    Join Date
    Apr 2008
    Posts
    21
    Can bad gasoline or water in your gas cause one or more of these fuel injector codes?
    Also, what exactly does injector circuit open mean? That to me means something electrical like fuel injector wire, or connector loose or damaged.
    I'm having same issue with #2 cylinder P0202 and misfire code. Had same problem on weekend, added sea foam to gas and now it is running fine for 2 days so far.

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