Code p0777
 

Pressure control solenoid (stuck on). I was hoping dirty fluid would of fixed it but no luck after we flushed trans and replaced filter. Are the solenoids in the TCM? I’m wanting to replace them all and be done with this issue. Also, best place to purchase? Trans is a 6l80.

Thanks in advance

Yes they are located in the TCM/solenoid pack.

I didn't dig too far but from what I did read it may be a combo of a solenoid failure and internal wear problems.

I've read in the past that even too much line pressure in the tune could cause a solenoid to stick.

Thanks, I did just load an updated tcm tune about a week ago but everything seemed fine and shifted great. I’ll ask my tuner if he upped line pressure. Wonder if we lowered it if it would “unstick”?