Shift Solenoids And

Fig 1: Identifying Shift Solenoids S1, S2, S3, S4 & S5

Courtesy of VOLVO CARS CORPORATION

The shift solenoids and are positioned in the valve body in the transmission control system, which is mounted on the front edge of the transmission. The shift solenoids (on/off type), consist of an electrical coil which controls a hydraulic valve. The solenoids are supplied with 12 V via the transmission control module and grounded in the control system. The shift solenoids control shifting. The transmission control module determines which gear is to be used by activating them in different patterns.

There is a diagnostic for the shift solenoids.