I need to program a key fob for a 2004 Cadillac CTS. I just purchased the car used. it came with ONE key and nothing els. I have recently purchased a keyless entree remote suitable for the car and was wondering how i can program it myself. my friend programmed his own on a 2001 cadillac STS. So there must be a way... THANKS

Question edited for clarity.
Question moved to model category.

By disconnecting the battery, you also disconnected all the set up of the security and engine immobilizer coding.

https://www.google.com/search?q=2003+cadillac+cts+security+system+reset

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Look for a button that allows you to slide the physical key out of the fob. Step 2: Turn the vehicle key to unlock the car door without releasing it. Hold the key for 30 seconds in this position. This will signal to your car's system that you have the right key, and will enable you to bypass your car's alarm system.

link is for key even though it states fob also https://www.youcanic.com/wiki/program-cadillac-key-fob-remote

key fob need re-programming

There are several methods of doing this - but your 2003 requires that you either go to the dealer for them to add a FOB with special equipment (ask if they'll do it for free - can't hurt). If you have time to kill, you can do it yourself with Method 3 as described and found at:

Key Fob Reprogramming General Cadillac Forums

Method 3 - Key Fob Auto Learn


This procedure will first erase all known key fobs. The procedure will then program a single or multiple key fobs. Method 3 is a series of three 10-minute key cycles, for a total of 30 minutes. This procedure requires that you have a replacement key fob and the vehicle mechanical key.

Important: All previously programmed key fobs will be erased upon completion of the 30-minute programming procedure. The order in which the key fobs are programmed will determine its numbering position within the RCDLR memory. The first key fob programmed will be key fob #1, and the second key fob programmed will be key fob #2. The number stamped on the key fob case is for reference only: #2 can be programmed as #1.
Do not place any known good key fobs in the vicinity of the vehicle when programming with Method 3. If the RCDLR recognizes a known good key fob during Method 3 programming, the programming mode will resort to Method 1.


The vehicle must be OFF.
Place the replacement key fob in the console pocket with the buttons facing forward.
Insert the vehicle key in the driver door lock cylinder located in the driver door handle and cycle the key 5 times within 5 seconds.
The DIC will display a message: OFF/ACC TO LEARN.
Press the OFF/ACC portion of the ignition button.
The DIC will display a message: WAIT 10 MINUTES, then it will count down from 10 to 0, one minute at a time.
When the counter reaches 0, DIC will display OFF/ACC TO LEARN.
Repeat steps 5-7 two more times, for a total of 30 minutes.
The DIC will display a message: OFF/ACC TO LEARN.
Press the OFF/ACC portion of the ignition button.
A beep will occur and the DIC will display: READY FOR FOB 1. At this time all previously known key fobs have been erased. When fob 1 is programmed a beep will be heard and the DIC will display a message: READY FOR FOB 2.
Additional key fobs can be programmed by taking fob 1 out of the pocket and inserting fob 2. If desired, up to 4 fobs can be programmed. Once 4 fobs have been learned, the DIC will display a message: MAX FOBS LEARNED, and automatically exit the program mode.
If learning less than 4 key fobs, press the OFF/ACC portion of the ignition button to exit the program mode.
Operate the active portion of each key fob in order to finalize the programming sequence and verify correct system operation.

Good luck!

Unfortunately, the website I found says there is no on-board method of programming your car for a new key-fob. You have to take the car to a dealer or to a key-maker (who may only charge half as much as the dealer)

Key Fob Remote Programming Instructions 2001 Cadillac Deville Key Fob...

try removing your key fob and replacing the battery .it sounds like its a security issue and the body control has locked you out and is keeping the key too.replacing the battery in the key fob should restore all.if not you will need a body control module and has to be programmed by a dealer.

Take it to a Cadillac dealer. The dealer uses a Tech II (computer) to reprogram your car to recognize the new key fob.

The battery may need replacing. I've experience the same problem and the battery was the problem. Good luck. Ned

Check neutral safety switch and security system

you need to take it to your chevy dealer so they can get the key code from gm online and the can program it in their shop. call GENERAL TRUCK SALES 800-382-7717