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Home >> GMC >> 2006 >> Sierra 1500 HD, RWD >> Repair and Diagnosis >> External Pages >> Different car >> Section 1350 (Automatic Transmission - 2ML70 - Removal & Installation, Service, Overhaul, Troubleshooting & Diagnosis) >> Description and Operation >> Automatic Transmission Hydraulic Diagrams >> Drive Range, First Gear >> 1-3 Clutch Applies >> #4 Pressure Switch

#4 Pressure Switch

WARNING: This page is about a different car, the 2009 GMC Sierra and 2009 Chevrolet Silverado. However, it is still accessible from the selected car via links, so may be relevant.

Solenoid 1 signal fluid passes through the 1-3 clutch regulator valve into the PS4 fluid passage. PS4 fluid opens the normally closed #4 pressure switch, signaling the TCM that the transmission is in Drive Range - First Gear.

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