Circuit Description

WARNING: This page is about a different car, the 2004 GMC Sierra, 2004 GMC Cab & Chassis Sierra, 2004 Chevrolet Silverado, and 2004 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

The flow of transmission fluid starts in the transmission pan. The fluid is then drawn through the filter and transmission case and into the oil pump assembly. The oil pump pressurizes the fluid into main pressure that is regulated at the main pressure regulator valve. From this point, fluid is directed to the F trim solenoid and to the control main regulator and control main relief valve, into the control main filter assembly, and on to all solenoids for use as control pressure. Hot fluid leaving the torque converter is routed through the converter flow valve to cooler lines and into the cooler assembly.

The transmission oil cooler is located in the radiator. The vehicle may be equipped with auxiliary oil cooler. The cooled fluid is returned to the transmission through the return cooler line and to the transmission lube circuit. The automatic transmission fluid temperature (TFT) sensor, which is part of pressure switch manifold (PSM) assembly, is located in the oil pan. If the transmission control module (TCM) detects a high TFT for an extended period of time, then DTC P0218 sets.

DTC P0218 is a type C DTC.