Circuit Description
The flow of 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 assembly pressurizes the fluid and directs it to the pressure regulator valve where it becomes the main supply 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 the 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 orificed cup plug in the rear of the transmission case to feed the rear lube fluid circuit.
If the PCM detects a high transmission fluid temperature for a long period of time, then DTC P0218 sets. DTC P0218 is a type D DTC.
Conditions for Setting the DTC
| • | No TFT Sensor DTCs P0712 or P0713. |
| • | The TFT is greater than 130°C (266°F). |
| • | All conditions met for 15 minutes (900 seconds). |
Action Taken When the DTC Sets
| • | The PCM does not illuminate the Malfunction Indicator Lamp (MIL). |
| • | The PCM freezes shift adapts from being updated. |
| • | DTC P0218 stores in PCM history. |
Conditions for Clearing the DTC
| • | A scan tool can clear the DTC from the PCM history. The PCM clears the DTC from the PCM history if the vehicle completes 40 warm-up cycles without a failure reported. |
| • | The PCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the PCM. |
Diagnostic Aids
| • | DTC P0218 may set approximately 900 seconds after DTC P0711 has set. Follow the diagnostic table for DTC P0711 before proceeding to the diagnostic table for DTC P0218. Repairing the condition that caused DTC P0711 will likely eliminate DTC P0218. |
| • | The TFT display on the scan tool should rise steadily to a normal operating temperature, then stabilize. |
| • | Verify the customer's driving habits, trailer towing, etc. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
DTC P0711 may cause DTC P0218 to set.
-
This step checks for air flow restrictions or damage which may result in the transmission overheating.
Step | Action | Value(s) | Yes | No | ||||||
|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Powertrain OBD System Check | |||||||
2 |
Important: Before clearing the DTC(s), use the scan tool in order to record the Failure Records for reference. Using the Clear Info function will erase the stored Failure Records from the PCM. Was the fluid checking procedure performed? | -- | Go to Transmission Fluid Check | |||||||
Is DTC P0711 also set? | -- | Go to Diagnostic Aids | ||||||||
Was a condition found? | -- | |||||||||
5 | Perform the line check procedure. Refer to 4L60-E Line Pressure Check Was a condition found? | -- | ||||||||
6 | Inspect the torque converter stator for damage. Refer to Torque Converter Clutch (TCC) Diagnosis Was a condition found? | -- | Go to Diagnostic Aids | |||||||
7 | In order to verify your repair, perform the following procedure:
Has the test run and passed? | -- | System OK |
