Circuit/System Description

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

The transmission fluid pressure (TFP) switch 5 is part of the control solenoid valve assembly which has no serviceable parts. The TCM supplies a signal circuit to the TFP switch 5. The TFP switch 5 has an internal case ground. TFP switch 5 is normally closed or LOW. When oil pressure is present at the TFP switch 5, the switch is open or HIGH. The normally high pressure control (PC) solenoid 3 controls pressure to the CBR1/4-5-6 clutch regular valve. The TCM monitors the TFP switch 5 signal circuit to determine the position of the CBR1/4-5-6 clutch regulator valve. When the 4-5-6 clutch is commanded OFF, pressure is present on the TFP switch 5. When the 4-5-6 clutch is commanded ON, the CBR1/4-5-6 clutch regulator valve moves and pressure to the TFP switch 5 is exhausted through the CBR1/4-5-6 clutch regulator valve.