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How serious is the P0301 code? P0301 is a common OBDII trouble code that appears in the Chevy Blazer It stands for P0301 should be considered a cause for concern, and can be a threat to the drivability your Blazer The one nice t Chevy Trailblazer P0301 Definition P0301 is a cylinder specific misfire code, which means that cylinder 1 is misfiring and causing the code An important thing to understand when finding the location of cylinder one is that it's going to be the first cylinder in the firing order of the vehicle, and not the first cylinder that you might see when looking at the engine 03 Trailblazer Code U1000 10 21 P0301 code chevy trailblazer