Test Description

WARNING: This page is about a different variant/trim than selected.

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

3: This step eliminates the TCM software as a possible cause of the DTC. If the DTC continues to set after reprogramming, the fault is in the TCM hardware.

DTC P0604

Step	Action	Value(s)	Yes	No
1	Did you perform the Diagnostic System Check - Automatic Transmission?	-	Go to Step 2	Go to Diagnostic System Check - Automatic Transmission
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 ECM Freeze Frame and the TCM Failure Records. Using the Clear Info function erases the Freeze Frame and Failure Records from the ECM and the TCM. Using the Clear Info function erases stored DTCs in both the ECM and TCM. Record the DTC Failure Records. Clear the DTC. Turn OFF the ignition for at least 30 seconds. Turn ON the ignition. Did DTC P0604 reset?	-	Go to Step 3	Go to Diagnostic Aids
3	Perform the Transmission Control Module Programming Procedure. Refer to Transmission Control Module Programming Procedure . Is the action complete?	-	Go to Step 5	Go to Step 4
4	Replace the TCM. Refer to Transmission Control Module (TCM) Replacement . Is the action complete?	-	Go to Step 5	-
5	Perform the following procedure in order to verify the repair: Select DTC. Select Clear Info. Turn OFF the ignition for at least 30 seconds. Turn ON the ignition. Select Specific DTC. Enter DTC P0604. Has the test run and passed?	-	Go to Step 6	Go to Step 2
6	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 in Engine Controls - 2.6L and 3.2L or Diagnostic Trouble Code (DTC) List in Engine Controls - 3.6L (LY7)	System OK