2023 Chrysler 300
Key Replacement - Save vs Dealer in Ventura County

Q: What exactly is a smart key and how is it different from a regular key?

Your 2023 Chrysler 300 uses a smart key, which means the fob handles both remote entry and engine authorization. There's a physical blade tucked inside for backup access to the door, but the fob itself communicates with the vehicle electronically to allow the engine to start. The five buttons handle lock, unlock, and the other remote functions. The difference from a basic key is that you can't just cut a copy at a hardware store.

Q: My 2023 Chrysler 300 is showing a key-not-detected warning. Where do I start?

Start with the battery. The fob uses a CR2032, and a low battery is the most common reason these warnings show up before the fob fully dies. A weak cell can cause intermittent detection issues that look like a programming problem but aren't. If a fresh CR2032 doesn't clear it, try holding the fob directly against the start area and attempting to start the vehicle.

Q: I bought a replacement fob online for my 2023 Chrysler 300. Can I program it myself?

No. Not on this vehicle. The 2023 300 doesn't have a DIY button-sequence or ignition-cycle relearn for the smart key system. Programming requires a diagnostic tool that can authenticate through the vehicle's secure gateway module, then register the new fob to the immobilizer. That step cannot be done without the right equipment. If you've already bought the fob, that's fine. Bring it along. I can verify it's the correct fob for your vehicle and program it on site.

Q: Does adding a second fob erase my existing working key?

No. Adding a spare registers the new fob alongside your existing one. Both stay active. The only time existing keys get erased is during an all-keys-lost procedure, where the system has to be fully reset before new fobs can be registered. If you still have a working fob, the add-a-key process keeps it untouched.

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2023 Chrysler 300 Smart Key Replacement - Fast, Affordable & Professional

I got a call from a guy over in the College neighborhood of Ventura. He'd been storing his 2023 Chrysler 300 while he was out of state for a few months, and when he came back to it, the fob was acting dead. No door response, no start. Just a key-not-detected warning on the dash every time he tried.

He found me on YouTube before he ever needed a locksmith. Watched a Chrysler fob job, saw the tools, saw the process, and saved the number. When it finally happened to him, he already knew what to expect. That part always makes the job easier.

I got to the storage lot with the car sitting under a shade structure, battery tender still plugged in. First thing I did was crack open the fob. The CR2032 inside wasn't totally dead but it was reading low enough to cause problems. Swapped it out on the spot.

That alone didn't fix it. The fob was pairing intermittently, then dropping. The vehicle wasn't holding the signal reliably. Based on what I was seeing, the fob itself needed to be re-registered to the system. That's where the gateway authentication comes in on these newer 300s. Took a few minutes to get through that step, then the programming ran clean.

Three starts. Walked both doors. Tested every button on the fob. Everything came back solid.

He mentioned what the dealer had quoted him for a replacement fob plus the programming visit. I won't put a number to it, but he made it clear I saved him a good chunk. More importantly, he wasn't waiting three days for a dealer appointment in a storage lot.

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Mary D.

Oct 2020

★★★★★

“We ran to an unfortunate situation, we lost the key to a Chrysler 300 so we called around and Steve gave us the best price he came out from oxnard and created us a new car key replacement. Were very grateful with the service”

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Joseph S.

Oct 2026

★★★★★

“Great service, super quick, and very accommodating. I will definitely come back if I need another key!!”

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Nadiia N.

Jul 2026

★★★★★

“I’m very thankful with ez car keyz service, they hooked me up with a new a new fob controller for my Nissan. The service was fast and professional. Thank you Marco.”

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Chrysler 300 Mobile Service FAQ

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My fob shell is cracked or broken. Can you fix it without reprogramming everything?▼

In most cases, yes. If the internal electronics are still intact, the circuit board and battery can be transferred into a new shell without touching the programming. The immobilizer is paired to the electronics, not the plastic housing, so a clean shell swap doesn't require re-registration. That said, I always verify the fob is responding correctly after any disassembly, because a cracked shell sometimes means the board took some stress too.