Question 1

Are you licensed and insured to work on Cadillac vehicles?

Accepted Answer

Yes. EZ Car Keyz holds a California Bureau of Security and Investigative Services locksmith license, LCO#6792, and carries full liability insurance. Beyond that, working on a 2020 CT4 isn't just a cutting job. The key fob has to be enrolled through the vehicle's immobilizer system using professional diagnostic equipment, and that requires current access to GM security programming data. I maintain those subscriptions and certifications. Not every locksmith does, and if they don't, they simply cannot complete the programming side of the job on a vehicle like this. Worth asking before anyone shows up.

Question 2

How do I know you're not a scam locksmith?

Accepted Answer

The pattern is pretty consistent. A scam operation quotes a low number over the phone to get you to commit, then invents reasons to charge two or three times that once they're standing next to your car. With a Cadillac, the move is usually to invoke the luxury badge as justification, as if the car being a CT4 means the job magically costs more than they said.

Here's what a real locksmith does: gives you a specific price for your specific vehicle before arriving, explains what the job actually involves, and has a real business name with reviews you can verify. I'll tell you exactly what your 2020 CT4 replacement is going to cost when you call, not after I've already driven to Mission Canyon. We also have over 100,000 followers across YouTube and TikTok where you can watch how we actually do this work on camera, so there's nothing hidden.

Question 3

Will the replacement key work exactly like the original?

Accepted Answer

Yes, when it's done correctly. The replacement fob gets enrolled to your CT4's immobilizer so the vehicle recognizes it as a legitimate key. All five buttons function the way the factory fob did. The emergency blade inside the housing is cut to your door lock. I test every single function before I leave, not just the start.

The reason I mention that: a CT4 owner on one of the GM forums bought an aftermarket fob online and had it programmed elsewhere. Lock and unlock worked, but the car wouldn't acknowledge it consistently at the start button. That comes down to using the wrong fob for the application or incomplete enrollment. With the correct replacement and a full enrollment process, you get a key that behaves exactly like the one that came from the factory.

Question 4

My CT4 shows a key-not-detected warning but the battery is fine. What's going on?

Accepted Answer

This one comes up a lot on CT4 forums. A fresh battery doesn't always mean the fob is communicating cleanly. A few things cause this beyond a dead cell.

The battery contacts inside the fob housing can oxidize or get slightly bent, especially if someone pried the case open the wrong way during a past battery swap. The fob reads as present but the signal is weak or inconsistent, and the car throws a key-not-detected warning even though the battery tests fine on its own.

There's also a scenario where the fob loses sync with the vehicle's immobilizer after a battery pull, a low-voltage event, or a long period of disuse. The fob isn't broken and the car isn't broken, they just need to be re-introduced through the OBD port. That's not something an ignition-turn sequence fixes on this generation. It requires a diagnostic tool. If holding the fob directly against the start button gets you a single successful start but the problem comes back, that's a strong sign you're dealing with a sync issue rather than a hardware failure.

Question 5

I only lost one key, not both. Do I still need a locksmith or can I just order a fob and program it myself?

Accepted Answer

You'll still need a locksmith or dealer to complete it. The 2020 CT4 does not have a self-programming sequence you can run from the driver's seat. Enrolling a new fob requires a professional diagnostic tool connected to the OBD port. You can absolutely buy the fob yourself beforehand if you want, just confirm it matches the factory FCC ID on your existing key before purchasing. But the programming step isn't optional and isn't something the car lets you do without equipment. The upside is that since you still have a working key, the job is faster than an all-keys-lost situation, and you typically don't need a tow.

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