DTC P0601-P0607, P1600, P1621, P1627, P1680, P1681 & P1683: ECM Memory: Description
WARNING: This page is about a different car, the 2002 GMC Sierra, 2002 GMC Cab & Chassis Sierra, 2002 Chevrolet Silverado, and 2002 Chevrolet Cab & Chassis Silverado. 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 Engine Control Module (ECM). This diagnostic also addresses if the ECM is not programmed. The following DTCs are diagnosed in this DTC test:
- 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 P1621 Control Module Long Term Memory Performance.
- DTC P1683 Control Module Ignition Off Timer Performance.