The two that we're concerned with are the 1-2 and 2-3 shift solenoids. Depending on the type of scan tool you're using (either a generic scan tool or a professional level technician's scan tool), these two solenoids will be called shift solenoid A and shift solenoid B or 1-2 shift solenoid and 2-3 shift solenoid.To avoid any confusion with what name is used to identify them:epending on the type of scan tool you're using (either a generic scan tool or a professional level technician's scan tool), these two solenoids will be called shift solenoid A and shift solenoid B or 1-2 shift solenoid and 2-3 shift solenoid. To avoid any confusion with what name is used to identify them: