How to Program 04 CTS After Battery Replacement: Expert Guide to Relearning ECM and Key Programming
To program a 2004 CTS after replacing the battery, disconnect the battery and wait 45 minutes. Next, turn the ignition key to the “ON” position for 30 minutes to reset the ECU. If needed, reset the security system by keeping the key in the “RUN” position. Refer to the owner’s manual for specific steps on … Read more