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 torque converter clutch (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.

The transmission fluid temperature (TFT) is between -39 to +149°C (-38 to +300°F) for 5 seconds.

The TFT is greater than 140°C (286°F) for 1 minute.

DTC P0218 is a type C DTC.

Ask the customer about possible overloading, exceeding the trailer towing limit, or towing in overdrive.

Schematic Reference

Automatic Transmission Controls Schematics

Connector End View Reference

Electrical Information Reference

Scan Tool Reference

DTC Type Reference

Ensure the transmission fluid is at the proper level by performing the Transmission Fluid Check .

1. Perform the Transmission Fluid Check .

⇒	If the level is not within specifications, repair as necessary.

2. Inspect for the following conditions:

•	Transmission line pressure low

•	Refer to Line Pressure Check . If the line pressure is low, refer to Incorrect Line Pressure .

•	Transmission fluid flow through cooler and/or auxiliary cooler, if equipped, is restricted due to the following conditions:

-	Transmission fluid level low

-	A clogged filter

-	A leaking filter or seal

-	Refer to Automatic Transmission Fluid Filter and Seal Replacement .

-	Plugged, kinked, or damaged transmission cooler pipes

-	Refer to Transmission Fluid Cooler Flushing and Flow Test .

•	Air flow through transmission fluid cooler and/or auxiliary cooler, if equipped, is restricted due to the following conditions:

-	Damaged fins

-

Debris

•	Engine overheating due to the following conditions:

-	Low coolant level

-	Inspect coolant temperature, coolant level, and hoses

-	Restricted air flow

-	Restricted coolant flow

-	Refer to Engine Overheating

If any of the conditions listed are found, repair as necessary.

Perform the Diagnostic Repair Verification after completing the repair.