Hard Shift into second
 

Good Afternoon everyone,

My name is Freddy and I have a 2012 Chevy Silverado LT 4.8L. The transmission recently started shifting hard from first into second. It started throwing the code P0717. I replaced the intake/turbine Speed Sensor, but it is still shifting very hard. Before I drop the transmission or start buying any other parts, I am looking for some advice. Thank you.

Probably a shift solenoid