I have a code p1618 cable fault between AW 50-Q2 tcm. Tcm-000b gear shift solenoid s1 hydraulic fault. I pulled side cover (4t65e) and replaced all solenoids. Still same problem. After a few minutes of driving transmission shifting perfect then trans go's into limp mode. Is this a TCM problem?

 

No - have you removed the trans oil pan and been amazed at the gold mine (flakes of metal) that you found there?

 

It was the first thing I did. Clean.