DTC P0601: Internal Controller Failure: Testing
WARNING: This page is about a different car, the 2000 Plymouth Breeze, 2000 Dodge Stratus, and 2000 Chrysler Cirrus. However, it is still accessible from the selected car via links, so may be relevant.
Turn ignition on. Using scan tool, retrieve DTCs. If DTC is present, replace Powertrain Control Module (PCM). If DTC is not present, test is complete.