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2004 GMC Yukon Denali XL 6.0 V8

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Old 05-18-2022, 03:15 PM
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Default 2004 GMC Yukon Denali XL 6.0 V8

Hi All,

I have two error codes P0300 and P0446. For P0300 i have replaced the spark plugs and wires and for P0446 i have replaced the gas cap but the code is still there.

Thank you.
Old 05-18-2022, 03:31 PM
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Did you CLEAR the codes?
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Old 05-18-2022, 04:41 PM
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Originally Posted by Mike
Did you CLEAR the codes?
yes I did twice
Old 05-18-2022, 05:40 PM
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What code is still there the misfires or the evap?
Old 05-18-2022, 07:35 PM
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Both codes are still there
Old 05-18-2022, 10:37 PM
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How does it run? History? Give us some info or we will not be able to help you.
Old 05-19-2022, 02:17 AM
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The truck runs fine it is as smooth as when I bought it new in 2004 it only has 107000 miles and always being serviced at GM dealership I replaced the spark plugs and wire and the gas cap over the weekend.
Old 05-19-2022, 09:26 AM
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Just to verify...
Key On, Engine Off... clear faults
Key Off.
Key On, Engine Off, READ faults.
Report back.
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Old 05-19-2022, 09:29 AM
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If the faults are still there after reading them again, something is wrong with your scanner and its not clearing them.
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Old 05-19-2022, 12:20 PM
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Hi Mike, I will try that and get back thank you.


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