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 PCM is not programmed.
DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681, P1683, or P2610
| 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 5 |
| 3 | Program the powertrain control module (PCM). Refer to Service Programming System (SPS)
in Programming and Setup. Does DTC P0602 reset? |
Go to Step 4 | Go to Step 7 |
| 4 |
|
Go to Step 5 | Go to Step 7 |
| 5 | Test all voltage and ground circuits to the control module for the following:
Did you find and correct the condition? |
Go to Step 7 | Go to Step 6 |
| 6 | Replace the PCM. Refer to Control Module References
in Computer/Integrating Systems for replacement, setup, and programming. Did you complete the replacement? |
Go to Step 6 | - |
| 7 | Start the engine. Did the DTC fail this ignition? |
Go to Step 2 | Go to Step 8 |
| 8 | Observe the Capture Info with a scan tool. Are there any DTCs that have not been diagnosed? |
Go to Diagnostic Trouble Code (DTC) List - Vehicle in Vehicle DTC Information | System OK |