DTC P0601-P0607, P1600, P1621, P1680, P1681 & P1683: Pcm Memory: Description

WARNING: This page does not describe the selected car, but rather 6 other vehicles, including the 2002 GMC Savana Special, 2002 GMC Savana Camper Special, 2002 GMC Savana, 2002 Chevrolet RV Cutaway, and 2002 Chevrolet Cutaway. However, it is still accessible from the selected car via links, so may be relevant.

This diagnostic applies to internal microprocessor integrity conditions within the Powertrain Control Module (PCM). This diagnostic also addresses if the PCM is not programmed. The following DTCs are diagnosed in this DTC table:

DTC P0601 Control Module Read Only Memory (ROM).
DTC P0602 Control Module Not Programmed.
DTC P0603 Control Module Long Term Memory Reset.
DTC P0604 Control Module Random Access Memory (RAM).
DTC P0605 Control Module Programming Read Only Memory (ROM).
DTC P0606 Control Module Internal Performance.
DTC P0607 Control Module Performance.
DTC P1600 Control Module Long Term Memory Reset.
DTC P1621 Control Module Long Term Memory Performance.
DTC P1683 Control Module Ignition Off Timer Performance.