Ok i have a 2011 altima 2.5s coupe automatic. I kept getting codes for the stepper motor and shift solenoid b. I ordered a stepper motor. Changed it. Now when its driving the transmission will not go into 2nd 3rd and so on. Even when i use the manual shift mode that doesn't change the ratio either. Now I have every single code on for the transmission possible. Anyone know if its a wiring problem or something? If more info is required i can provide it. Thank you to anyone who can help me.