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Engine code P0056

Discussion in 'GM Powertrain' started by Burden33, Apr 4, 2011.

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  1. Burden33

    Burden33 New Member 100 Posts

    I hooked up the programmer today to change a few things and it showed up with a engine code PO056 anyone know what the code means.
  2. mfleetwood

    mfleetwood Moderator 1000 Posts 100 Posts

  3. Burden33

    Burden33 New Member 100 Posts

    ya that linked helped thanks.
  4. mfleetwood

    mfleetwood Moderator 1000 Posts 100 Posts

    You're welcome!
  5. chevynewb4

    chevynewb4 New Member

    Where on the truck is that sensor for me to change it myself?
  6. Guardrail

    Guardrail New Member

    O2 sensors are on the exhaust pipe, before and after the cat converter.
  7. chevynewb4

    chevynewb4 New Member

    Its showing bank 2 sensor 2. So would that be the second sensor on the exhaust pipe?
  8. BurbanMan

    BurbanMan Member 100 Posts

    Only problem with this is that an o2 sensor code can be thrown by more than a bad o2 sensor. That could indicate an emissions vaccum leak as well. Cel codes are only a basis to begin diagnostic. That's why so many people get pissed off at autozoners when they buy part after a code reading and it doesn't fix the problem
  9. chevynewb4

    chevynewb4 New Member

    Ya I know...tough to be sure. Just want to know where that bank 2 sensor 2 is thats all.
  10. BurbanMan

    BurbanMan Member 100 Posts

    ah yeah. I forgot to post that. Pass side after the cat. If you only have one o2 sensor behinds the cat, that sort of narrows it down to a definite answer lol

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