Test Description

WARNING: This page is about a different car, the 2004 Pontiac Aztek and 2004 Buick Rendezvous. 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.

2: A low fluid level may cause an overtemperature condition.

DTC P0218 (3.6L)

Step	Action	Value(s)	Yes	No
1	Did you perform the Diagnostic System Check - Engine Controls?	-	Go to Step 2	Go to Diagnostic System Check - Engine Controls in Engine Controls - 3.6L
2	Install a scan tool. Turn ON the ignition, with the engine OFF. IMPORTANT: Before clearing the DTC, 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. Perform the Transmission Fluid Checking Procedure. Refer to Transmission Fluid Checking Procedure . Was the Transmission Fluid Checking Procedure performed?	-	Go to Step 3	Go to Transmission Fluid Checking Procedure
3	Inspect for the following conditions: Transmission line pressure low Refer to Line Pressure Check Procedure . If line pressure is low, refer to Incorrect Line Pressure . Transmission fluid flow through cooler and/or auxiliary cooler, if equipped, is restricted due to: Transmission fluid level low A clogged filter A leaking filter or seal Refer to Oil Filter and Seal Replacement . Plugged, kinked or damaged transmission cooler pipes Refer to Automatic Transmission Oil Cooler Flushing and Flow Test (J35944-A) or Automatic Transmission Oil Cooler Flushing and Flow Test (J45096) . Air flow through transmission fluid cooler and/or auxiliary cooler, if equipped, is restricted due to: Damaged fins Debris Engine overheating due to: Low coolant level. Check coolant temperature, coolant level and hoses Restricted air flow Restricted coolant flow Refer to Engine Overheating in Engine Cooling. Did you find and repair the condition?	-	Go to Step 4	Go to Diagnostic Aids
4	Perform the following procedure in order to verify the repair: Install a scan tool. Select DTC. Select Clear Info. Start the engine and run the engine until it reaches normal operating temperature. Select Engine Run Time and Trans. Fluid Temp. on the scan tool. Drive the vehicle for 15 minutes. Ensure that the transmission fluid temperature has stabilized and is less than 135°C (275°F). Select Specific DTC. Enter DTC P0218. Has the test run and passed?	-	Go to Step 5	Go to Step 2
5	With a 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 in Engine Controls - 3.6L	System OK