Hmmm. It could mean either pressure regulator solenoid 2 or shift solenoid 2 – probably best to check them both. If you disconnect the multiplug at the back of the transmission you’ll see a 16-pin connector :

Measure the resistance across pins 9 & 16 (shift solenoid 2) and you should get a reading close to 26 Ohms :

Between pins 3 & 12 (pressure regulator solenoid 2) it should be close to 6 Ohms :

Is the TRANS FAILSAFE PROG message appearing?
Phil