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International Automotive Technicians Network
Re: GM 5.3 setting P0521
Posted to Technical Discussion Forum on 5/2/2021

I,ve tried to get that info from TAC and was accused of calling only to argue. I told them that somewhere there has to be a spec chart or how does the ecm know when to flag the MIL and that info could aid in diagnostics. Was told that they didn't have access t... Login to read more.