Circuit Description

WARNING: This page is about a different car, the 2003 Buick Regal and 2003 Buick Century. However, it is still accessible from the selected car via links, so may be relevant.

Transmission fluid is drawn from the bottom pan through the filter, case assembly, channel plate assembly, control valve body assembly and into the oil pump assembly. The pump is mounted on the control valve body assembly. Fluid pressure leaving the pump is controlled by the pressure regulator valve and becomes the main supply of line pressure to the various components and hydraulic circuits.

Hot fluid from the torque converter flows through the TCC control valve into the cooler lines to the oil cooler located in the vehicle radiator (and auxiliary cooler if equipped). Cool fluid then returns to lubricate the final drive assembly and other components along the output shaft.

If the PCM detects a high temperature on the TFT sensor circuit for an extended period of time, then DTC P0218 sets. DTC P0218 is a type "C" DTC.