Circuit Description

WARNING: This page is about a different car, the 2007 GMC Sierra and 2007 Chevrolet 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 transmission fluid is then drawn through the filter and the transmission case 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 torque converter clutch (TCC) solenoid and to the control main regulator valve 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, located in the radiator. The vehicle may be equipped with an 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 the pressure switch manifold (PSM) assembly, is mounted to the valve body.

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.