DTC P0218 Transmission Fluid Overtemperature Gas
Circuit Description
The flow of transmission fluid starts in the transmission pan. It is then drawn through the filter and transmission case into the oil pump assembly. The oil pump assembly pressurizes the fluid (line pressure), which becomes the main supply line of fluid. This fluid is directed to various components and hydraulic circuits within the transmission. The pressure regulator valve receives this fluid and directs it to the converter clutch shift valve. The converter clutch shift valve directs hot fluid leaving the torque converter or regulated converter feed fluid, through the cooler line to the transmission oil cooler. The transmission oil cooler is located in the radiator. The vehicle may also be equipped with an auxiliary oil cooler. The cooled fluid (center lube) is returned to the transmission trough the return cooler line and into center lube port of the transmission. The Automatic Transmission Fluid Temperature (TFT) Sensor, senses the fluid temperature in the transmission pan.
If the Vehicle Control Module (VCM) detects a high TFT 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 are met for 410 seconds. |
Action Taken When the DTC Sets
| • | The VCM does not illuminate the Malfunction Indicator Lamp (MIL). |
| • | The VCM freezes shift adapts from being updated. |
| • | DTC P0218 is stored in the VCM history. |
Conditions for Clearing the DTC
| • | A scan tool can clear the DTC from the VCM history. The VCM clears the DTC from the VCM history if the vehicle completes 40 warm-up cycles without a failure reported. |
| • | The VCM cancels the DTC default actions when the fault no longer exists and the ignition is OFF long enough in order to power down the VCM. |
Diagnostic Aids
| • | Inspect the cooling system fluid level and condition. |
| • | Verify the customer's driving habits, such as trailer towing, etc. . . |
| • | The scan tool Trans. Fluid Temp. (TFT) should rise steadily during warm-up cycles then stabilize. |
| • | DTC P0218 may set approximately 600 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 set DTC P0711 will likely eliminate DTC P0218. |
| • | First diagnose and clear any engine DTCs or TP Sensor codes that are present. Then inspect for any transmission DTCs that may have reset. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
DTC P0711 may also set a DTC P0218. Go to the DTC P0711 tables for diagnosis.
-
This step inspects for air restrictions and loss of transmission fluid flow, causing an extremely high TFT.
Step | Action | Value(s) | Yes | No | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | Go to Powertrain On Board Diagnostic (OBD) System Check (5.7L) or Powertrain On Board Diagnostic (OBD) System Check (7.4L) | |||||||||||||||||
2 |
Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and Failure Records for reference. Using the Clear Info function will erase the stored Failure Records from the VCM. Was the fluid checking procedure performed? | -- | Go to 4L80-E Transmission Fluid Check | |||||||||||||||||
3 | Is DTC P0711 also set? | -- | Go to Diagnostic Aids | |||||||||||||||||
Was a condition found? | -- | |||||||||||||||||||
5 | Perform the line pressure check procedure. Refer to 4L80-E Line Pressure Check . Was a condition found? | -- | ||||||||||||||||||
6 | Inspect the torque converter stator for damage. Refer to Torque Converter Clutch Diagnosis . Was a condition found? | -- | Go to Transmission Overheats | |||||||||||||||||
7 | In order to verify your repair, perform the following procedure:
Has the test run and passed? | -- | System OK |
DTC P0218 Transmission Fluid Overtemperature Diesel
Circuit Description
The flow of transmission fluid starts in the transmission pan. It is then drawn through the filter and transmission case into the oil pump assembly. The oil pump assembly pressurizes the fluid (line pressure), which becomes the main supply line of fluid. This fluid is directed to various components and hydraulic circuits within the transmission. The pressure regulator valve receives this fluid and directs it to the converter clutch shift valve. The converter clutch shift valve directs hot fluid leaving the torque converter or regulated converter feed fluid, through the cooler line to the transmission oil cooler. The transmission oil cooler is located in the radiator. The vehicle may also be equipped with an auxiliary oil cooler. The cooled fluid (center lube) is returned to the transmission trough the return cooler line and into center lube port of the transmission. The Automatic Transmission Fluid Temperature (TFT) Sensor, senses the fluid temperature in the transmission pan.
If the Powertrain Control Module (PCM) detects a high TFT 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 are met for 410 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 is stored in the 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
| • | Inspect the cooling system fluid level and condition. |
| • | Verify the customer's driving habits, such as trailer towing, etc. . . |
| • | The scan tool Trans. Fluid Temp. (TFT) should rise steadily during warm-up cycles then stabilize. |
| • | DTC P0218 may set approximately 600 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 set DTC P0711 will likely eliminate DTC P0218. |
| • | First diagnose and clear any engine DTCs or TP Sensor codes that are present. Then inspect for any transmission DTCs that may have reset. |
Test Description
The numbers below refer to the step numbers on the diagnostic table.
-
DTC P0711 may also set a DTC P0218. Go to the DTC P0711 table for diagnosis.
-
This step inspects for air restrictions and loss of transmission fluid flow, causing an extremely high TFT.
Step | Action | Value(s) | Yes | No | ||||||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|---|
1 | Was the Powertrain On-Board Diagnostic (OBD) System Check performed? | -- | ||||||||||||||||||
2 |
Important: Before clearing the DTCs, use the scan tool in order to record the Freeze Frame and 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 4L80-E Transmission Fluid Check | |||||||||||||||||
Is DTC P0711 also set? | -- | Go to Diagnostic Aids | ||||||||||||||||||
Was the condition found? | -- | |||||||||||||||||||
5 | Perform the line pressure check procedure. Refer to 4L80-E Line Pressure Check . Was the condition found? | -- | ||||||||||||||||||
6 | Inspect the torque converter stator for damage. Refer to Torque Converter Clutch Diagnosis . Was the condition found? | -- | Go to System Diagnosis Table Transmission Overheating | |||||||||||||||||
7 | In order to verify your repair, perform the following procedure:
Has the test run and passed? | -- | System OK |
