I have a 01 Impala with a 3.4 4T65E in the shop and just rebuilt the transmission. It is shifting very hard and I have no communication to any of the modules. I have between 0-7 volts on pin 2 of the diagnostic connector as I should and the scanner powers up fine and works. its a older snap-on graphing brick. any thoughts? Thanks.

Kurt Chappell
Owner
Tranztech
Dubuque, Iowa, USA