Circuit/System Description

WARNING: This page does not describe the selected car, but rather 7 other vehicles, including the 2008 GMC Yukon XL, 2008 GMC Yukon, 2008 Chevrolet Tahoe, 2008 Chevrolet Suburban, and 2008 Cadillac Escalade EXT. However, it is still accessible from the selected car via links, so may be relevant.

The clutch pressure control (PC) solenoid 4 is integral to the control solenoid (w/body and TCM) valve assembly and has no serviceable parts. The PC solenoid 4 is a normally high-pressure control solenoid which provides fluid pressure to the B-2-6 clutch regulator valve. The TCM controls the solenoid pressure by regulating the exhaust fluid. When the TCM commands the solenoid off, the exhausting fluid is stopped and the B-2-6 pressure is high. When commanded on, the clutch PC solenoid 4 regulates the amount of exhausting transmission fluid. Solenoid power is supplied by the TCM through a high side driver (HSD). The HSD protects the circuits and components that the TCM powers. Should the circuit overload the driver will shutdown. After the overload is removed the HSD reset.