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Thread: codes

  1. #1

    Default codes

    i have a 2001 chevy tahoe with a po300 code ive changed the spark plugs and the wires and the coils are getting a good spark what else could i check

  2. #2


    They have a web site just for this problem!
    92 GMC Sierra 2500

  3. #3


    If your ignition is all OK you may have a dirty injector. Have you ever cleaned your injectors or added any injector cleaner to the gas tank?

    2004 SILVERADO 2500HD LS
    Pro Comp Leveling Kit
    285-75-16 Cooper ST All Terrains
    Pro Comp Programmer
    Bilstein Shocks
    Linux Bed Liner
    Tinted Windows

    Other rides:

    1967 Landcruiser <350 Chevy>
    1970 Camaro
    1990 Geo Metro Convertible
    2007 FJ Cruiser

  4. #4


    I am dealing with that problem. I have changed the plugs, wires, air filter, fuel filter, fuel pump (stupid decision), and two coils - finally like a smart person I took it to the dealer for a diagnostic because the light kept staying on. They said it was a leak at the intake gasket, so I am in the process of changing that. Good luck.

    Auto Zone only gave a PO300, I took it to a garage and they said it was on coils 1 & 3 and after that coil swap, it came on again and moved to coils 5 & 8, hence the trip[ to the dealer.

    I have a 2004 Tahoe, 5.3 flex
    Last edited by J-wall; 07-30-2009 at 10:41 AM. Reason: added more info

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