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Re: 1997 P30 Van 4L80E harsh 1-2 shift
Posted to Transmission Forum on 11/27/2009

The code and resulting 35% default is because the computer saw something it didn't like. Is the EPC amps 0 at all times? I suspect it is. Go ahead and clear the code and them see what the TPS and EPC read and how it shifts. I understand why you are asking the ... Login to read more.