Test Description

WARNING: This page is about a different car, the 2007 Cadillac DTS. However, it is still accessible from the selected car via links, so may be relevant.

The numbers below refer to the step numbers on the diagnostic table:

2: DTC P0218 may set approximately 60 seconds after DTC P0711 has set. Follow the diagnostic table for DTC P0711 before proceeding to the diagnostic table for DTC P0218. Repair of the condition that set DTC P0711 will likely eliminate DTC P0218.
3: This step ensures that the transmission fluid is at the proper level. A low fluid level may cause an overtemperature condition.
4: This step inspects for air restrictions and loss of transmission fluid flow causing an extremely high TFT.

DTC P0218

Step	Action	Values	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 Failure Records. Using the Clear Info function erases the Failure Records from the TCM. Record the Failure Records. Clear the DTCs. Did 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 Pinched, plugged, twisted or damaged cooler lines or hoses Insufficient cooler flow Low AT fluid cooler flow. Refer to Automatic Transmission Oil Cooler Flushing and Flow Test (J 45096) or Automatic Transmission Oil Cooler Flushing and Flow Test (J 35944-A) . The transmission fluid and filter for: Fluid that has become contaminated with engine coolant. Refer to Engine Coolant/Water in Transmission . A clogged filter or a filter that is not seated correctly. Refer to Side Cover, Gasket, and Filter Removal . Clogged scavenger screens. Refer to Scavenge Screens and Seals Replacement . The upper control valve body for: Torque converter clutch control valve (317) stuck in the OFF position. Fluid circuits leaking or blocked with debris. Refer to Upper Control Valve Body Disassemble . 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 must be 135°C (275°F) or less for 5 seconds. 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