Problem Reports » Check Engine Light Due to Restricted Secondary Air Injection Check Valves

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GMC Sierra 1500 HD

 

Report: Check Engine Light Due to Restricted Secondary Air Injection Check Valves

GMC Sierra 1500 HD Problem
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Model Years Affected: 2001, 2002, 2003, 2004, 2005, 2006, 2007

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One or both secondary air injection check valves may become restricted causing poor air flow resulting in illumination of the Check Engine Light. It is often recommend to replace both check valves even if a fault code is set for only one bank of cylinders. Replacing only one valve may result in a return trip to the repair shop.

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