2016 3500 SRW. Check engine light came on after a hard shift when I was cruising on a highway at about 75 mph. Check engine code was P0970. Mechanic said a solenoid failed but had to replace to while valve body since we still can't buy just the solenoid. The new valve body is in but going through the relearn process, it keeps failing. The Mopar mechanic doesn't know why... Anyone have experience or advice?