Test Description

WARNING: This page is about a different car, the 2007 GMC Yukon XL and 2007 Chevrolet Suburban. However, it is still accessible from the selected car via links, so may be relevant.

The number below refers to the step number on the diagnostic table.

4: This step inspects for air restrictions and loss of transmission fluid flow, causing an extremely high TFT.

DTC P0218

Step	Action	Yes	No
1	Did you perform the Diagnostic System Check - Vehicle?	Go to Step 2	Go to Diagnostic System Check - Vehicle
2	Install a scan tool. Turn ON the ignition, with the engine OFF. IMPORTANT: Before clearing the DTCs, use the scan tool in order to record the ECM and TCM Failure Records. Using the Clear Info function erases the Failure Records from the ECM and TCM. Using the Clear Info function erases stored DTCs in both the ECM and TCM. Record the Failure Records. Clear the DTCs. Was DTC P0711 also set?	Go to DTC P0711	Go to Step 3
3	Perform the Transmission Fluid Checking Procedure. Refer to Transmission Fluid Checking . Did you perform the Transmission Fluid Checking Procedure?	Go to Step 4	Go to Transmission Fluid Checking
4	Inspect the engine cooling system for the following conditions: Air flow restrictions Air flow blockage System fluid level and condition Debris in the radiator Inspect the transmission cooling system for the following conditions: Air flow restrictions Air flow blockage Debris Damaged cooler lines or hoses Low AT Fluid Cooler flow Refer to Automatic Transmission Oil Cooler Flushing and Flow Test (J 35944-A) or Automatic Transmission Oil Cooler Flushing and Flow Test (J 45096) .Did you find and correct the condition?	Go to Step 7	Go to Step 5
5	Perform the Line Pressure Check Procedure. Refer to Line Pressure Check . Did you find and correct the condition?	Go to Step 7	Go to Step 6
6	Inspect the torque converter stator for damage. Refer to Torque Converter Diagnosis . Did you find and correct the condition?	Go to Step 7	Go to Symptoms - Automatic Transmission
7	Perform the following procedure in order to verify the repair: Select DTC. Select Clear Info. Operate the vehicle under the following conditions. Turn ON the ignition, with the engine OFF. The TFT sensor is 129°C (265°F) or less for 5 seconds or greater. Select Specific DTC. Enter DTC P0218. Has the test run and passed?	Go to Step 8	Go to Step 2
8	With the scan tool, observe the stored information, capture info and DTC info. Does the scan tool display any DTCs that you have not diagnosed?	Go to Diagnostic Trouble Code (DTC) List - Vehicle	System OK