p0442 and p0455 codes

Discussion in 'Chevy Trailblazer Forum (GMC Envoy)' started by trippinout, Jul 22, 2009.

  1. trippinout

    trippinout New Member

    Hi all, did some searching for these codes and they all mention another code (p0499). I have not gotten that code, but am wondering if the codes I have are preemptive to that code. Its a 2006 Chevy Trailblazer 4.3L 6 cyl. I have already purchased a new gas cap and cleared the codes. Now they are back...any help would be appreciated.
  2. dsfloyd

    dsfloyd Epic Member 5+ Years ROTM Winner 1000 Posts

    If you have checked/replaced the gas cap you need to look for a hole in the evap system. the p0455 is a large leak and the other is a small leak in the system. Its going to be in a hose or other part of the fuel evap system. Others may have specific fixes to these codes
  3. Jimmiee

    Jimmiee Epic Member 5+ Years 1000 Posts

    The quickest way to find the leak is with a smoke machine. Whatever you do don't blow air into the tank! Find a shop with a smoke machine and the leak will appear in no time. Other wise you will just being throwing parts at it. The leak may be in the back around the tank or anywhere in between the tank and the engine.

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