I wasn't getting any codes, just symptoms that told me the circuit of fluid was working fine when cold, but the solenoid wouldn't cut the fluid bypass to unlock the converter when warm. I removed it and tested all solenoids.
I don't take cars to repair shops, so the was the next logical step unfortunately was to
Replace with new OEM. And everything works awesome... for a few months.
Now reverse works fine when cold, but won't engage solenoid to open fluid circuit to lock clutches for reverse...
and this is an 08' so no mods are avail