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  1. Aftermarket Mods.
    * PLEASE READ THE FORUM RULES *** - Moderation Staff
  2. 2016+ XLD28 Duramax Powertrain
    Has anybody run into a P20CB code? I had it pop up last spring, cleared it to see if it would replicate and it never came back until this week. Cleared it and it popped up again. I am not even sure where to start when it comes to the emissions systems. Thanks!
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