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International Automotive Technicians Network
Re: GM REF HI and EST issue
Posted to Technical Discussion Forum on 10/25/2023

craig ,

FIRST do what steve suggested !!! simple and accurate .

IF YOU NEED/FEEL THE NEED TO...

look at your primary PARADE when it's cold . this was/is a very common problem .

you'll want to scope the ECM INPUTS/OUTPUTS to be sure it's not the ecm as ... Login to read more.