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05-21-2016, 09:31 AM | #1 | |
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2005 Yukon XL Denali P0300 Code
My 2005 Yukon XL Denali, 6.0, 160k, throws a persistent and recurring P0300 code. It consistently stumbles and shifts hard in low gear, runs and shifts smoothly after the first shift, but code P0300 appears at 60-70 mph without fail after clearing it. There have not been any other codes. |
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05-27-2016, 11:03 AM | #2 | |
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Re: 2005 Yukon XL Denali P0300 Code
The 6.0L is very sensitive to build up in the throttle body, causing rough idle/misfire conditions. I'd check and clean the throttle body and see if that helps.
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05-29-2016, 07:59 PM | #3 | ||
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Re: 2005 Yukon XL Denali P0300 Code
Quote:
I gave the throttle body a good cleaning today. Despite the fact it was very dirty it did not fix the stumbling trying to find gear. I guess next I'll look into a vacuum leak somewhere, then dirty or bad injectors. Still getting only a p0300, nothing else, so if anyone has any ideas I'd love to hear. Maybe the camshaft position sensor? Thanks in advance. |
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