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Thread: Catalytic converter monitoring

  1. #1
    Tuner in Training b2319dragracer's Avatar
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    Catalytic converter monitoring

    Trying to turn off or disable my catalytic converter monitoring ( drive cycles ). 2012 Camaro 3.6L E39 ECM. Or can someone tell me how far I need to drive to clear the cycle. I do not drive this car much and trying to keep the mileage down on the odometer. Thanks for any and all help. If I could turn off all the drive cycle monitoring would be great.

  2. #2
    Tuning Addict 5FDP's Avatar
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    Could be up to 100 miles in some cases, not sure if there is a set number known for every test the computer does unless you worked for GM.
    2016 Silverado CCSB 5.3/6L80e, not as slow but still heavy.

    If you don't post your tune and logs when you have questions you aren't helping yourself.

  3. #3
    Advanced Tuner
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    heres the info on p0420/p0430 also explains how to get the test to run
    Attachment 81732
    ive done a couple LLT engines catless and i never had any luck getting the cat test to pass because the ecm is different with how to disable dtc's

  4. #4
    Advanced Tuner ZeroBoostBuick's Avatar
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    I'm sure the 3.6 and the newer engines are different, but I had the impression many 2008 and earlier GM cars used to do a more thorough cat test after filling the tank with fuel at least 3/4 full.

    Shortly after filling up I would watch the fuel trims go -15 or -20 for a minute, giving me the idea the ecm is dumping more fuel to test the efficiency of the cat.

  5. #5
    Advanced Tuner
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    Possible but hot soak can cause that and some and newer ecms have a injector tip modifier which also adds fuel but not available on that ecm I dont think