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International Automotive Technicians Network
Re: 2008 GM 6.6 P0101
Posted to Technical Discussion Forum on 10/4/2024

The air filter is a good place to start. Then also check the EGR. Make sure the valve is not coked up. The ECM may think the EGR is open at idle but in actuality it is restricted causing excessive air flow. Hope this helps. Login to read more.