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Thread: Throwing P0496

  1. #1
    Join Date
    Feb 2011
    Location
    LaPlace, Louisiana
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    Throwing P0496

    Truck threw this code last week before I left for FL: P0496

    Definition:

    Evap flow during a non-purge condition

    The ECM has detected pressure in the EVAP system during a non-purge condition.

    Probable cause:
    1. Purge or vent solenoid failure

    2. Plugged EVAP canister condition

    3. Failed EVAP pressure sensor


    If somebody can explain to me what EVAP is I can probably give you a better example of whats wrong with the truck..
    Run your motor, not your mouth..

    04 ECSB 5.3 Sierra: 14.6@95
    Pacesetter Headers, Intake, Tune

  2. #2
    Join Date
    Aug 2008
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    North Texas
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    Usually purge solenoid stuck open mechanically.

  3. #3
    Join Date
    Feb 2011
    Location
    LaPlace, Louisiana
    Posts
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    Nobody knows what this relates to? or how I can fix it?
    Run your motor, not your mouth..

    04 ECSB 5.3 Sierra: 14.6@95
    Pacesetter Headers, Intake, Tune

  4. #4
    Join Date
    Aug 2008
    Location
    North Texas
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    Quote Originally Posted by 04SilverBullet View Post
    Nobody knows what this relates to? or how I can fix it?
    Really?

  5. #5
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    Yes, really..
    Run your motor, not your mouth..

    04 ECSB 5.3 Sierra: 14.6@95
    Pacesetter Headers, Intake, Tune

  6. #6
    Quote Originally Posted by 04SilverBullet View Post
    Nobody knows what this relates to? or how I can fix it?
    Quote Originally Posted by GasGuzzler View Post
    Usually purge solenoid stuck open mechanically.
    I'd say he does. Go get a new purge solenoid. It's on the intake manifold just behind the throttle body.

  7. #7
    Join Date
    Feb 2011
    Location
    LaPlace, Louisiana
    Posts
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    I wasn't saying he didn't know, I just still didn't get what it was.. I have no idea what a purge solenoid is..
    Run your motor, not your mouth..

    04 ECSB 5.3 Sierra: 14.6@95
    Pacesetter Headers, Intake, Tune

  8. #8
    Join Date
    Aug 2008
    Location
    North Texas
    Posts
    12,438
    It may not fix it, it's tough to diagnose and repair vehicles that are somewhere else. Just posting up what little I know from my day to day encounters. Anyone smart enough to join and post on this board can replace the purge valve on an LS engine truck......and even if you don't know what it is, the person you buy it from should. If not, buy elsewhere.

  9. #9
    Join Date
    Feb 2011
    Location
    LaPlace, Louisiana
    Posts
    405
    Code went away today... got gas from somewhere else, so I guess Racetrac just had bad gas or something..
    Run your motor, not your mouth..

    04 ECSB 5.3 Sierra: 14.6@95
    Pacesetter Headers, Intake, Tune

  10. #10
    Join Date
    Jun 2011
    Location
    Clarksville, TN
    Posts
    199
    Sounds like a lil water in the gas...

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