How to Program a 2020 Cadillac CT4 Ignition Smart Chip Key Transponder
Step by Step How to Programming Instructions:
**If you have no working keys:**
Unfortunately, you cannot program a new key yourself in this situation. Here are your options:
1. Preferred Option: Contact a mobile Automotive Locksmith to come to your vehicle and originate a new key. The Locksmith will then connect a special computer to your vehicle to program the new key.
2. Tow your vehicle to a Dealership, and they will originate a new key. The Dealership will also connect a special computer to your vehicle to program the new key.
**If you have one working key:**
You cannot program a second key yourself. Here are your options:
1. Preferred Option: Call or visit an Automotive Locksmith, and they will connect a special computer to your vehicle to program the second key.
2. Go to a Dealership, and they will connect a special computer to your vehicle to program the second key.
**If you have two working keys:**
Yes, you can program a third key yourself. Once you have had the new key cut by a Locksmith, follow these instructions:
1. Insert an existing working key into the ignition cylinder.
2. Turn the ignition cylinder to ON (RUN) and then back to OFF.
3. Remove the existing working key and, within five seconds, insert a second working key and turn it to ON (RUN), then back to OFF.
4. Remove the second working key and insert the new key before ten seconds have elapsed. Turn it to ON (RUN). Leave it on for one second and then turn back to OFF.
5. The security light will light up for three seconds to indicate that the new key has been successfully programmed.
If you have lost all keys for the vehicle, you will need to find a locksmith to come to your vehicle to originate a new ignition key.
**Special Procedure for 1996 Mustang GT & Cobra Only:**
After you have had a Locksmith cut the transponder key, follow these instructions:
1. Insert the new key into the ignition and turn it to the ON position (as far as you can go without cranking the engine). The security light on the dash will flash for fifteen minutes.
2. When the security light stops flashing, turn the ignition OFF, then back to the ON position. The security light will flash for fifteen more minutes.
3. Repeat step 2.
4. After the security light stops flashing for the third time, turn the key to the OFF position. Turn the key to the ON position, and the security light should stop flashing, indicating the new key has been programmed.
5. Start the vehicle to test the key.
**For programming a second key if you have one working key:**
Yes, after you have had a Locksmith cut the transponder key, follow these instructions:
1. Insert the existing working key into the ignition and turn it to the ON position, then back to the OFF position.
2. Within 5 seconds, insert the new key into the ignition and turn it to the ON position. The security light will light up for 2 seconds to indicate successful programming. Turn the key to the OFF position.
3. Start the vehicle to test the new key.
