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Home >> Pontiac >> 2009 >> Vibe Base, 2.4 0, AWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 54 (Automatic Transmission - 4T80-E - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Description And Operation >> Automatic Transmission Hydraulic Diagrams >> Park - Engine Running >> Hydraulic Controls >> The 1-2 Shift Solenoid (SS) Valve

The 1-2 Shift Solenoid (SS) Valve

WARNING: This page is about a different car, the 2009 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

The 1-2 SS valve is energized (turned ON) by the PCM, blocking the exhaust port through the solenoid. This creates high pressure in the 1-2 shift solenoid valve circuit. Solenoid pressure holds the 1-2 shift valve in the downshifted position. This pressure is also routed to the 3-4 shift valve.

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