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  1. #1

    Default How to access ODB I I codes

    I have a 2004 Chevy Trailblazer. it has 47,950 miles on it and the service engine light is on and i want to know how to access the ODB II codes. Thanks.

  2. #2


    The only way I know of is to beg/borrow/buy a scanner/code reader and hook it up. It seems like Harbor Freight sells a bottom of the line OBD-2 code reader for ~$50, and then go up from there.

    Some parts stores (like Autozone) will read the trouble codes for you (in hopes of selling parts). I've even seen a few repair shops who will read trouble codes for free in hopes of getting your business.
    '98 K1500 Suburban LS 5.7 L 4L60E NV246 ARB
    '92 Ford Explorer XLT 4x4 4.0 L A4LD BW13-54 Trac-loc rear
    "My toys were the greasy cogs and springs and pistons that lay around all over the place, and these, I can promise you, were far more fun to play with than most of the plastic rubbish children are given nowadays." Danny in Roald Dahl's Danny The Champion of the World

  3. #3
    Jr. Engineer Rumpamuro's Avatar
    Join Date
    Apr 2007
    Mississauga, Ontario (Canada)


    At my shop we read trouble codes for free. Too bad im in Canada

  4. #4
    Jr. Engineer Rumpamuro's Avatar
    Join Date
    Apr 2007
    Mississauga, Ontario (Canada)


    forgot to ask.. did you put gas in right before you got the light? whether you did or didnt. tighten the gas cap and drive around for a bit.

  5. #5


    Welcome to the forum!!

    Whenever I have check engine light come on, I head to the local AutoZone and have them check it for me. If you can get a competent employee, they can look at the code description and give you some good suggestions. MrShorty is right, of course they want to sell you parts, but you don't have to buy anything. Bottom line, you have a better idea what the problem is! Although, it may take a little trial and error to solve the problem.
    Hallsville, TX

    2005 Silverado 1500 LS Crew Cab 5.3L 2WD
    Magnaflow Exhaust
    Hypertech Max Energy Programmer
    Suspension Leveling Kit
    Putco Element Window Visors
    Carriage Works Billet Grille
    TruXedo TruXport Tonneau Cover

  6. #6


    I want to thank everyone who replyed. thank u. u guys are great

  7. #7


    Hi ChevyGurl,
    I can thoroughly recommend using a CarChip from DAVIS Instruments California. Not only does it read trouble codes and allows you to switch off the engine warning light but it also allows you to monitor all aspects of your vehicle use; speed, rpm, engineload, coolant temp and batt voltage.
    It simply plugs on to the OBDII socket.

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