Chrysler 300 Key Replacement 2011-2023 — Annetta TX

The second-generation Chrysler 300 ran for well over a decade with the same body, which is convenient for owners and misleading for anyone quoting key work. A 2012 and a 2022 look nearly identical in an Annetta driveway and do not take the same key, do not use the same programming path, and do not cost the same to replace. The VIN settles it in seconds; the badge on the trunk settles nothing. Call or text (817) 813-9396 for Chrysler 300 key replacement in Annetta, Weatherford, Aledo, Willow Park, Hudson Oaks, Benbrook and Fort Worth.

Quick Answer

Across this generation the 300 used two very different credentials. Earlier cars carry a FOBIK — a fob-shaped key that inserts into a slot on the dash and twists, combining the remote and the immobilizer chip in one plastic body with no traditional metal blade in the ignition. Later cars moved to a true proximity smart fob with push-button start, where the key stays in your pocket. Both are registered through the vehicle's radio frequency hub, and from the 2018 model year the security gateway module sits between the diagnostic port and the vehicle network, restricting unauthenticated write access. That gateway is the single biggest reason later 300 key jobs need proper equipment rather than a cheap tool from an online marketplace.

Chrysler 300 Key Pricing in Annetta TX

As of August 2026, typical Parker County ranges:

Disclaimer: Ranges only. Model year, trim, key type and how many working keys you hold all move the number. Call or text (817) 813-9396 with the VIN before buying a part.

FOBIK Versus Proximity: The Split That Drives Everything

The FOBIK

A FOBIK looks like a fob and behaves like a key. You push it into a slot on the dashboard and rotate it exactly as you would a traditional key, and the immobilizer chip lives inside the fob body rather than in a plastic key head. There is a hidden emergency blade inside, released by a catch, for opening the driver door when the car's battery is flat.

FOBIKs fail in a characteristic way. The plastic body cracks at the seam after years of being twisted in the slot, and the internal board flexes. Owners often describe the car as needing the key jiggled, which sounds like a worn ignition and frequently is not — it is a fob whose internal connections have gone intermittent. Diagnosing that difference before ordering parts is worth the phone call.

The proximity smart fob

Later 300s dropped the slot for push-button start. The fob communicates passively with antennas built into the body, and the car authorizes start when it detects a valid credential inside the cabin. These fobs are more expensive as parts and more involved to register, and they are the ones where the security gateway matters most.

The RF Hub Is the Real Gatekeeper

On the Chrysler platform, the radio frequency hub — the RFH — is the module that receives your fob's transmission, decides whether the credential is trusted, and authorizes the powertrain. It holds the list of keys the car accepts.

This matters for two reasons. First, if the RF hub itself fails, no amount of key work helps. The symptom is distinctive: two independent fobs stop being recognized at the same time, often with a key not detected message on the cluster. Buying a third fob into that situation is money spent on the wrong component, and it happens regularly.

Second, replacing an RF hub is itself a programming job — the module has to be married to your VIN, and not every used module can be re-married. Some carry a permanent association with their donor vehicle and are simply scrap for your car regardless of tool or price. We cover that in detail in our Ram 1500 RF hub and security gateway article, which describes the same architecture on the truck side of the family.

The 2018 Security Gateway Changed the Job

From the 2018 model year, Chrysler group vehicles carry a security gateway module positioned between the diagnostic connector and the internal vehicle network. Its function is to permit reading freely while blocking unauthenticated writing. A scan tool can look at the car all day and cannot change anything — including keys, module identities and configurations — without authenticated access.

For owners this has one practical consequence: the gap between a cheap tool and a real one became absolute rather than gradual. Before the gateway, a marginal tool did a worse job. After the gateway, it does no job at all.

It also means quotes for 2018 and newer 300s legitimately differ from quotes for 2017 and older, and anyone giving you a single price for a decade of production is not accounting for it.

All Keys Lost on a 300

Losing every key is a different job from adding a spare, and the difference is not merely time.

With a working key, the car already trusts a credential and adding another is done under that authority. It is quick, usually under half an hour on site.

With no working key, the credential must be originated — created from the vehicle's own data rather than copied. Proof of ownership becomes mandatory: photo identification plus registration, title or insurance in a matching name, checked against the VIN on the car. On later gateway-equipped cars, authenticated access is required before any write takes place. Some model years also carry a deliberate security delay, and that delay is manufacturer-designed and cannot be shortened.

The practical takeaway is the same one that applies to every vehicle in this class: a spare cut in advance is dramatically cheaper than an origination performed at night in a parking lot. If your 300 is down to one key, that is the moment to fix it cheaply. Our Chrysler Pacifica and Voyager all keys lost article covers the same origination process on the minivan platform, and Dodge Charger and Challenger key fob programming covers the mechanically related cars built on the same architecture.

What Actually Goes Wrong With Chrysler 300 Keys

The cracked FOBIK. Years of twisting in the dash slot split the housing. Sometimes a replacement shell and a chip transfer solves it inexpensively; sometimes the board is finished.

The dead coin cell mistaken for a dead fob. Reduced range is the tell. Works at the door, does not work from the porch. A few dollars fixes it.

The used car with unknown keys. If you bought your 300 privately, the previous owner may still hold a working fob. Re-registering the key set during any visit invalidates anything not physically present, and it costs nothing extra while the tool is already connected.

The online fob that will not register. Chrysler used several fob variants across this generation with different frequencies and part numbers. A physically similar fob is not necessarily a compatible one. Send the part number before you buy and we will confirm it.

The no-start that is not the key at all. Ignition switch faults, weak batteries and RF hub failures all produce symptoms that feel like a key problem. Diagnosis before parts is the cheaper order of operations.

Mobile Service Across Parker County

All of this work is performed at the vehicle. Cutting equipment, blanks, diagnostic interface and power support travel in the van, and a 300 that will not start does not need to be towed anywhere. That last point is usually the largest saving of the day — a tow to a dealership plus a service appointment plus a wait for parts is a considerably more expensive path to the same outcome.

We serve Annetta, Weatherford, Aledo, Willow Park, Hudson Oaks, Benbrook, Fort Worth and the surrounding 76008 area. Texas locksmith licensing is administered by the Texas Department of Public Safety through its Private Security Program.

Frequently Asked Questions

How much is a Chrysler 300 key replacement in Annetta TX? As of August 2026, a spare FOBIK typically runs $185 to $300 and a spare proximity smart fob $265 to $450. All keys lost runs roughly $250 to $425 on FOBIK cars and $375 to $675 on proximity cars. The model year and VIN determine which applies.

What is a FOBIK and does my 300 have one? A FOBIK is a fob-shaped key that inserts into a slot on the dash and twists to start the car. If your 300 has that slot rather than a push button, you have one. Later cars with push-button start use a proximity smart fob instead.

Why does my 2019 cost more than my neighbour's 2015? From 2018 the security gateway module blocks unauthenticated write access to the vehicle network, so key work on later cars requires authenticated access and takes longer. It is a real difference in the job, not a markup.

My 300 says key not detected with both fobs. What now? Two independent fobs failing identically points at the car rather than the keys, most often the RF hub or its antenna wiring. Diagnosis should come before buying a third fob, because a third fob will not help.

Can you make a key if I lost all of them? Yes. Origination is a standard procedure, requires proof of ownership, and takes longer than adding a spare. Later gateway cars need authenticated access, and some model years carry a built-in security delay that cannot be bypassed.

Do you come to me, or does the car need towing? We come to you. Key cutting and programming happen at the vehicle anywhere in Annetta, Weatherford, Aledo, Willow Park, Hudson Oaks, Benbrook and Fort Worth. No tow is needed.

A Chrysler 300 is one of the vehicles where the model year genuinely changes the answer, so the VIN is the first question rather than the last. Call or text (817) 813-9396 and we will tell you which key your car takes, whether your symptoms point at the fob or the hub, and what the job costs before anyone leaves the shop.

Written by the Annetalocksmith Automotive Locksmith Team — mobile automotive locksmith and vehicle module programming serving Annetta, Weatherford, Aledo, Willow Park, Hudson Oaks, Benbrook, Fort Worth and Parker County, Texas.