Circuit/System Testing: P0602

WARNING: This page is about a different car, the 2006 Buick LaCrosse and 2006 Buick Allure. However, it is still accessible from the selected car via links, so may be relevant.

Program the ECM. If DTC P0602 sets after programming, perform the following steps:

Ensure that all tool connections are secure.
Ensure the programming equipment is operating correctly.
Ensure the correct software and the correct calibration is used.
Attempt to program the ECM.
- If DTC P0602 sets, replace the ECM.