Test Description
WARNING: This page is about a different car, the 2005 Buick LaCrosse and 2005 Buick Allure. 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 DTC P0602 indicates the TCM is not programmed.
DTC P0601, P0602, P0603, or P0604 (3.6L)
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle in Vehicle DTC Information |
| 2 | Is DTC P0602 set? | Go to Step 3 | Go to Step 4 |
| 3 | Program the TCM. Refer to Control Module References in Computer/Integrating Systems for replacement, set-up and programming. Does DTC P0602 reset? |
Go to Step 4 | Go to Step 5 |
| 4 | Replace the TCM. Refer to Control Module References in Computer/Integrating Systems for replacement, set-up and programming. Did you complete the replacement? |
Go to Step 5 | - |
| 5 | Perform the following in order to verify the repair:
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 DTC's that you have not diagnosed? |
Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK |