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Re: 2000 C1500 harsh 1-2 shift, no codes
Posted to Transmission Forum on 5/22/2018

This transmission is in failsafe mode. When this happens the PCM raises the line pressure. You would assume all shifts would be firm but this is not the case with the 4L60E. Only the 1-2 shift is affected. All other shifts and engagements will be normal.

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