Engine Control Module: Notes

WARNING: This page is about a different car, the 2003 GMC Sierra, 2003 GMC Cab & Chassis Sierra, 2003 Chevrolet Silverado, and 2003 Chevrolet Cab & Chassis Silverado. However, it is still accessible from the selected car via links, so may be relevant.

NOTE: Service of the ECM should normally consist of either replacement of the ECM or EEPROM programming. If the diagnostic procedures call for the ECM to be replaced, the ECM should be checked first to see if it is the correct part. If it is, remove the faulty ECM and install the new service ECM. The service ECM EEPROM will not be programmed. DTC P0601 and P0602 indicates the EEPROM is not programmed or has malfunctioned.

NOTE: Programing Engine Control Module requires a compatible scan tool and a Techline® terminal. Procedure uses a Tech 2® scan tool.