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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1681 (Automatic Transmission - 4L60-E/4L65-E/4L70-E - Description And Operation) >> Description and Operation >> Automatic Transmission Hydraulic Diagrams >> Manual Third Gear >> 1-2 Shift Solenoid (SS) Valve

1-2 Shift Solenoid (SS) Valve

WARNING: This page is about a different car, the 2010 GMC Sierra and 2010 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

When Manual Third is selected, the PCM de-energizes the 1-2 SS valve to immediately downshift the transmission into Third gear. This electronically prevents Fourth gear.

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