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If you come across trouble code P0496 on your vehicle, it indicates an issue with the EVAP system's flow during a non-purge condition. This problem is especially critical if you reside in a state with emissions testing requirements. Essentially, the code signifies an obstacle concerning the purge flow in your EVAP system. There are multiple potential causes for this problem, each with their own corresponding solutions. It is recommended to begin your diagnosis with the EVAP purge volume control valve, as this is often the main culprit. If that does not resolve the issue, you can proceed to check the EVAP pressure sensor, EVAP system hoses, electrical connectors, and charcoal canister. It is highly probable that by following this process, you will pinpoint and address the problem.
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OBD-II code P0496 indicates that there is a problem with the Evaporative Emission System due to excessive purge flow.
This Chevy Avalanche code points to a problem with the evaporative emission system having excessive purge flow.