hi to all my problem started today after driving for 4 miles engine ligth came on then the car wasn't changing gears so I stopped and turn the car off then turn it back on and it was fine then it did it again and it gave me this code p0155, p0700, p1776 can someone help thanks

 

155 - O2 sensor bad (not related to your problem)

700 - EATX fault present (in the TCM)

1776 - Solenoid valve stuck in L/R
- Switch Soleonoid stuck in LR

Those are the codes, but I'm no help in a trany. The 700 is letting you know to do a scan on the trany (not with a simple/inexpensive OBD scan tool). I think the 1776 is the actual trany fault and that perticular switch or valve is stuck in low/reverse (reverse has only one gear speed, low).

PS bank 2 sensor 1 O2 sensor is the one that triped.