I copied one of your pics and circled the shift linkage. Does the vehicle go into gear at all? The linkage is disconnected. See pic 1 below.
As far as the code, it indicates there is excessive voltage with the 1-2 shift solenoid. It could be shorted.
Pics 2 and 3 are the diagnostics for the code. Pic 4 is the wiring schematic for the shift circuits. Pic 5 shows the 1-2 shift solenoid location in the transmission, and the last pic shows the location of the TCM. It is right below the battery on the driver's side.
Check the wiring to the TCM. I've seen battery acid cause damage, so that could be an issue.
Let me know what you find.
See pics below.
Images (Click to enlarge)
Friday, June 24th, 2022 AT 8:07 PM