Test Description
WARNING: This page is about a different car, the 2006 Pontiac Montana SV6, 2006 Chevrolet Uplander, and 2006 Buick Terraza. 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 (3.9L)
| Step | Action | Yes | No |
|---|---|---|---|
| 1 | Did you perform the Diagnostic System Check - Vehicle? | Go to Step 2 | Go to Diagnostic System Check - Vehicle |
| 2 | Is DTC P0602 set? | Go to Step 3 | Go to Step 4 |
| 3 | Program the TCM. Refer to Control Module References for replacement, setup and programming. Does DTC P0602 reset? |
Go to Step 4 | Go to Step 5 |
| 4 | Replace the TCM. Refer to Control Module References for replacement, setup 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 | System OK |