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reseting evap

Discussion in 'All Non F-body Tech' started by 4thand26, Nov 15, 2015.

  1. 4thand26

    So I am working on a 2004 silverado, it through p0446. I pulled the vent valve and cleaned it, very dirty. Any ideas on getting this computer to reset? I've driven 5 times. cold and hat starts. city and freeway about 45 miles. All I found on line was http://www.obdii.com/drivecycle.html. I have done about 20 start/stop cycles.
     
    4thand26, Nov 15, 2015
    #1
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  2. Z28/Ken Staff Member Admin

    The p0446 is coming back even if you manually clear it with the scanner?
     
    Z28/Ken, Nov 15, 2015
    #2

  3. 4thand26

    no, i can not get the computer to reset the evap test
     
    4thand26, Nov 15, 2015
    #3

  4. Z28/Ken Staff Member Admin

    Hmmmm... maybe a cold reset is in order by disconnecting the battery for an hour, to kill the keep alive memory, since it's been cleaned. That'll start the computer in a fresh state, sounds like right now it's decided the P0446 is a "hard" code.
     
    Z28/Ken, Nov 15, 2015
    #4

  5. 4thand26

    sorry, i miscommunicated, not a hard code, i'm having trouble reseting it
     
    4thand26, Nov 15, 2015
    #5

  6. LSWrench

    If you cleaned and the code won't go away maybe the solenoid is stuck or the circuit faulty. I bet the solenoid
     
    LSWrench, Nov 16, 2015
    #6

  7. 4thand26

    the problem was getting the computer to go through enough cycles to complete the self-test. It finally did and the p0446 code is back :(
     
    4thand26, Nov 16, 2015
    #7

  8. 4thand26

    Thanks again, pulled it again, cleaned it thoroughly, code is code all is well :)
     
    4thand26, Nov 26, 2015
    #8
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