Answer
Jul 22, 2026 - 08:13 AM
To program a new ignition lock cylinder, insert the new key into the ignition and turn it to the "On" position without starting the engine; leave it in this position for about 10 minutes until the security light turns off. Repeat this process two more times (a total of three cycles), then turn the key to "Off" and start the vehicle to complete the programming. Note: This procedure applies to many GM vehicles; always check your owner's manual or service manual for specific instructions for your car.
