My 4l60e is not holding 1st and it doesn't engage 4th.. I changed both 12 23 solenoids and still the same problem... I adapted this tranny with a e-transcontrol PCM.
After changing both... I realized that when the car is cold it works first but after a little time running it stops... Actually it looks like it engages 1st but after a little movement it changes to 2nd.
My next thought maybe could be the pcw... Because when the oil gets warm the pressure decreases... But 2 to 3 is changing correct.
Any idea what I'm dealing with??

 

Welcome to the forum! could you give a little more information on the controller and when the issue started? Any codes present, fluid level, and condition ok?
Brad

 

Thanks
E-Trans Control
This is the controller... I don't have the codes as I have it on a antique.. Fluid level is OK.. Actually this tranny was recently rebuild and used a TCI shift kit... And then it was put in the project... At some period of tests it was OK... But a fill days ago it started failing.. When is very cold the car its OK... But after a fill minutes it starts with no 1st and 4th... It was why I supposed it could be ta A solenoid... Change both... No luck... Maybe could be the PCS because I Have a very smooth changing from 2 to 3rd... My controller I can change the line pressure, before the problem I could change the value and have some hard shifting and now I can change the value and nothing.

 

What year 4L60E are you using? Was this just a plug and play controller or did you wire it in?
Brad

 

It's a 96 and it's plug and play.. But I rechecked all wires and they are OK...

 

A would you have the instructions for the shift kit by chance? Very strange behavior I would suspect electrical issue but very well could be mechanical. Have you contacted the controller company?
Brad

 

We just made a vacuum test on the VB and looks like we have a likeage on the 3 2 valve.. Do you think this could be the issue?