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The code P004 for a 2005 Chevrolet Trailblazer indicates a problem with the vehicle's turbocharger or supercharger boost control system. This code typically points to an issue with the boost pressure, such as underboost or overboost conditions. It's important to inspect related components, including the pressure sensors, hoses, and the turbocharger itself, to diagnose the exact cause of the problem. Addressing this issue is crucial for maintaining engine performance and fuel efficiency.
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