2-3 shift problem 4L80e

[mts-rides]

Hi .

I hope someone can help me. no idea what i am doing wrong.
Have a 12205612 operating system.
The computer did not belong to this engine. Have an LS1 5.7
And 4L80e gearbox in a 1939 GMC truck

Engine works fine. I only have 1 and 2 gear and nothing else.
When I switch on the solenoid 1-2 with vcm scanner I hear it click.
When I turn the 2-3 on I don't hear anything.

I measure the yellow / black wire at point 47 (red) 12v.
When I connect it to ground I hear a click in the gearbox
So solenoid works.

I look in vcm scanner at the channels:
Shift solenoid 1-2. i can switch it on / off with vcm scanner
Shift solenoid 2-3. remains off whatever I do.

If I turn on 1-2 solenoid and then turn on 2-3. Then 1-2 off. Then 1-2 solenoid remains on until I turn 2-3 off

Have used the transswap file 2000 silverado 6.0 4L80E 612 OS.hpt.

hope someone can help me

[mts-rides]

Hi.

Is it possible.
That the input from the computer is not working?

Can I test that?
Otherwise I will have to buy a new PCM and also a new credit.
Maybe only to find out that it is something else.

Don't know if it's a software or hardware problem.