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  1. General Discussion
    Soooo just had the 203b code pop up, reductant level performance sensor… if someone could please help. Which actual thing do i gotta replace, is it the reductant def pump , or the actual def heater pump I’m not sure where the sensor is actually located… any suggestions ?? It’s a 2013 LML
  2. Introductions
    I'm a Silverado owner, not an attorney, but I am very frustrated by the lack of response from GM so I'm looking into whether a class action lawsuit might wake them up. I am seeking input from members that have, or had, issues with their DEF system. Problems like: inaccurate DEF gauge readings...
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