P0218

DTC P0218 (3.8 L)












Circuit Description with 4L30-E Automatic Transmission
The flow of the transmission fluid starts in the bottom pan and is drawn through the filter, control valve body assembly, transmission case and into the oil pump assembly. The oil pump assemble pressurizes the fluid and directs it to the pressure regulator valve where it becomes the main supple of fluid to the various components and hydraulic circuits in the transmission. Hot fluid exiting the torque converter flows through the converter clutch apply valve and into the transmission cooler lines to oil cooler located in the vehicle radiator (and auxiliary cooler if equipped). From the cooler, fluid returns to cool and lubricate the front of the transmission. In forward drive ranges, D4 fluid from the manual valve is routed through an orifice cup plug in the rear of the transmission case to feed the rear lube fluid circuit.
When the Powertrain Module (PCM) detects high Transmission Fluid Temperature (TFT) for a long period of time, then DTC P0218 sets. DTC P0218 is a type C DTC.

Conditions for Running the DTC
^ No TFT sensor DTCs P0711, P0712, P0713.
^ The ignition switch is ON for 5 seconds.

Conditions for Setting the DTC
The TFT is greater than 130°C (266°F) for 60 seconds (10 minutes).

Action Taken When the DTC Sets
^ The PCM does not illuminate the Malfunction Indicator Lamp (MIL).
^ The PCM freezes shift adapts from being updated.
^ The PCM records the operating conditions when the Conditions for Setting the DTC are met.
^ The PCM stores DTC P0218 in PCM history.

Conditions for Clearing the DTC
^ A scan tool can clear the DTC.
^ The PCM clears the DTC from PCM history if the vehicle completes 40 warm-up cycles without a non-emission-related diagnostic fault occurring.
^ The PCM cancels the DTC default actions when the fault no longer exists and/or the ignition switch is OFF long enough in order to power down the PCM.

Diagnostic Aids
^ The scan tool Trans. Fluid Temp. should rise steadily to a normal operating temperature, then stabilize.
^ Ask about the customers driving habits, trailer towing, etc. Trailer towing should occur in D3.

Test Description
The numbers below refer to the step numbers on the diagnostic table.
3. This step inspects for air flow restrictions or damage which may result in the transmission overheating.