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I have a 2008 GMC Trailblazer with engine code P049PD, what does the code mean?

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I have a 2008 GMC Trailblazer with engine code P049PD, what does the code mean?

Vehicle: 2008 GMC Trailblazer

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Some codes need two occurrences to set, if the code includes "PD" at the end, it means that the problem only happened once and needs another occurrence to set.

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Read more: https://www.autocodes.com/p0449_chevrolet.html

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