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Home >> Buick >> 2009 >> Allure CX >> Repair and Diagnosis >> Transmission >> Hydraulic Diagrams >> Automatic Transmission - 4T65-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis >> Description And Operation >> Automatic Transmission Hydraulic Diagrams >> Overdrive Range, First Gear >> 2-3 Shift Solenoid (SS) Valve (315B)

2-3 Shift Solenoid (SS) Valve (315B)

Energized (ON) by the PCM, high pressure in the 2-3 signal fluid circuit holds the 2-3 and 3-4 shift valves in the downshifted position.