It could be the ignition switch
google --www.chevyavalancefanclub.com and there is a statement there from a person relating to checking the switch and wiring for the solenoid
the code p 7085 is correct and does refer to 2-3 solenoid
It's P0785
DTC P0785 3-2 Shift Solenoid Circuit Electrical (4.3L)
Rather then just replacing parts do you know how to do continuity checks on a electrical circuit ? IT could even be the driver inside the VCM - vehicle control module .
The 3-2 shift solenoid (SS) valve assembly is a normally-closed, 3-port, on/off device that controls the 3-2 downshift. The solenoid attaches to the control valve body within the transmission. The solenoid receives ignition voltage through circuit 1020. The vehicle control module (VCM) controls the solenoid by providing a ground path on circuit 687. During a 3-2 downshift, the 2-4 band applies as the 3-4 clutch releases. The VCM varies the timing between the 3-4 clutch release and the 2-4 band apply, depending on the vehicle speed and the throttle position.
When the VCM detects a continuous open, short to ground or short to power in the 3-2 SS valve assembly circuit, then DTC P0785 sets. DTC P0785 is a type A DTC.
You would need to see more codes for the ignition switch to be the problem .
How to diagnose bad GM truck Ignition Switch
SOURCE: shift solenoid
The solenoid comes out with one screw and one wire connection once the pan is dropped.
SOURCE: What does code P0753 Shift Solenoid mean?
P0753 means your powertrain computer detects a continuous open, short to ground or short to power in the circuit to your transmission's 1-2 shift solenoid. When the code is active, your transmission runs in a fail safe/limp home mode that only lets certain gear ratios function in the transmission.
The solenoid in your application looks like this
and it is located sometimes on the side of the transmission, but my guess is from the looks of it, it might be found inside the transmission, only accessible with the oil pan removed.
The problem might be the solenoid itself, or the wiring going to the solenoid from the computer that controls the transmission, or the computer itself.
SOURCE: 1997 transmission Slow Acceleration
not sure if this is the answer yet but i have the same problem with the same codes i work at an auto parts store and a few of the techs that are customers have lead me in the direction of changing the ignition switch, i am doing it today will let you know if it solves the problem
SOURCE: where is the shift solenoid
on your front diff its 2'' in diameter 5 '' long with a 5 pin wiring plug on it
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