A strategically placed piece of black tape on the instrument cluster works wonders.
Do you have aftermarket wheels? GM sensors? how old are the sensors?
That would be the first thing I'd look at. New sensors are $80-90 each plus $100 to install.
Think about the black tape.
My 2005 Tahoe which has never given me a bit a problems doesn't want to shift from 2-3. If you pump or feather the accelerator it will shift and then drive fine. It has a 120K miles, fluid is clean not burnt and it has no DTC codes. I dropped the pan and checked the shift solenoids. they both...
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