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passcode

  1. Transponder keys for 06 3500 HD

    Maintenance
    Hi Thought I'd share this info about getting a spare ignition key for my 2006 3500 HD 4x4. I had read that there is a built-in GM security system called Passcode where there is a chip embedded in the head of the ignition key that is sensed by the ignition switch. After doing some research, it...
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