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2004 GMC Yukon Denali XL 6.0 V8

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Old 05-19-2022, 01:06 PM
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Thank you!
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Old 05-19-2022, 03:13 PM
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Hi Mike,

So i did what you asked me to do as per your instructions and i didn't get any error code. I will drive around and see if it comes back.

Thank you.
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Old 05-20-2022, 09:14 AM
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Thank you, I thought something didn't seem right when you said those codes were still their after a code clearing. Typically EVAP fault codes won't trip until a drive cycle has been completed. and P0300'* won't trip unless you feel the engine running like ****, and then the CEL is FLASHING. Which is a bad thing.
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Old 05-20-2022, 11:39 AM
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Thank you Mike! i have driven almost 40 miles so far the CEL has not come back, i will let you know if it comes back on.
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Old 05-20-2022, 04:38 PM
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Yes, please keep us updated.
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Old 05-20-2022, 06:13 PM
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Hi the P0300 code came back on again but the P0446 went away any suggestion on the next step?
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Old 05-20-2022, 06:30 PM
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Originally Posted by hasibkhan
Hi the P0300 code came back on again but the P0446 went away any suggestion on the next step?
Does it misfire? What are all the codes? There should be some other P030X codes telling which cylinders are at fault.
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Old 05-20-2022, 06:34 PM
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no it does not misfire and it only shows one error code P0300 the engine is running smooth.
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Old 05-20-2022, 08:30 PM
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Is the CEL on? This don't make sense.
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Old 05-20-2022, 08:51 PM
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Yes it is still on
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