Shift Solenoids S1, S2, S3, S4 And S5

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

Courtesy of VOLVO CARS CORPORATION

The shift solenoids S1, S2, S3, S4 and S5 are positioned in the valve body in the gearbox control system, which is mounted on the front edge of the gearbox. 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 (TCM) and grounded in the control system. The shift solenoids control shifting and the transmission control module (TCM) determines which gear is to be used by activating them in different patterns.

There is a diagnostic for the shift solenoids.