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    Jrod7571's Avatar
    Jrod7571 Posts: 5, Reputation: 1
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    #1

    Jul 17, 2012, 07:08 PM
    04 Yukon XL engine light
    My engine light is on but I'm not getting any codes. I had my truck diagnosed at Auto Zone many times before for other problems and they were very helpful. Is it possible that the light is malfunctioning? Or do I need to see the dealer?
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #2

    Jul 18, 2012, 05:11 AM
    If the Check Engine Light stays on, when the ignition switch is turned to ON, it may be indicating the PCM is failing.
    Jrod7571's Avatar
    Jrod7571 Posts: 5, Reputation: 1
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    #3

    Jul 19, 2012, 03:24 AM
    Quote Originally Posted by TxGreaseMonkey View Post
    If the Check Engine Light stays on, when the ignition switch is turned to ON, it may be indicating the PCM is failing.
    Thanks. Is the pcm the main computer? Does anyone know ware its located in the Yukon?
    TxGreaseMonkey's Avatar
    TxGreaseMonkey Posts: 16,761, Reputation: 5597
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    #4

    Jul 19, 2012, 04:30 AM
    Yes. It's likely located along the firewall (passenger's side) under the hood. Look for a large bundle of wires going to it.
    Jrod7571's Avatar
    Jrod7571 Posts: 5, Reputation: 1
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    #5

    Jul 19, 2012, 03:48 PM
    Quote Originally Posted by TxGreaseMonkey View Post
    Yes. It's likely located along the firewall (passenger's side) under the hood. Look for a large bundle of wires going to it.
    Thank you!
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