Chrysler Transponder Key (chip ID64) — CY24 Blade Profile & Fitments

Fitments for the Chrysler Transponder Key (chip ID64) span a wide range of Chrysler and Dodge platforms from the mid-1990s through 2010, including the 300M, Concorde, PT Cruiser, Sebring, Town & Country, and Dodge Dakota, among others. Across these vehicles, the unit handles engine immobilizer authentication through a passive RFID exchange between the key head and the vehicle’s Sentry Key Immobilizer Module (SKIM). Each Chrysler Transponder Key (chip ID64) carries a Texas Instruments transponder embedded in the plastic bow, programmed to respond to challenges from the SKIM during ignition. Owners replacing the device should expect a dealer- or locksmith-level programming procedure before the vehicle will start. When ordering a Chrysler Transponder Key (chip ID64), confirm the CY24 keyway profile matches the specific lock cylinder on the target vehicle.

Technical Specifications of the Chrysler Transponder Key (chip ID64)

The transponder chip inside this key is the ID64, manufactured by Texas Instruments. In the Chrysler key & lock service ecosystem, this chip is part of the broader Sentry Key Immobilizer System (SKIS) that Chrysler Remote Key Fob (FCC ID KYPT03C98JA) – Vehicle Key G deployed across multiple model lines during this era. The ID64 uses a fixed-code architecture where the transponder responds to a rolling cryptographic challenge issued by the SKIM module located near the ignition lock cylinder. Unlike remote keyless entry fobs, this product has no buttons and no radio frequency transmission — it operates purely as a passive immobilizer device, drawing power inductively from the SKIM antenna ring surrounding the ignition barrel.

The blade profile is CY24, a standard Chrysler mechanical keyway used on the vehicles listed below. The CY24 blank must be precision-cut on a code machine or duplicated from a working original using a standard key-cutting machine equipped with the correct jaw and cutter. Because the blade is a traditional edge-cut design rather than a high-security sidebar type, mechanical duplication is straightforward for any locksmith with standard Chrysler key data.

Validated Vehicle Fitments

The following vehicles are confirmed to accept the ID64 transponder on the CY24 keyway. When sourcing a replacement, verify the model year falls within the ranges below:

• Chrysler 300M — 1999 to 2004
• Chrysler Cirrus — 1995 to 2000
• Chrysler Concorde — 1998 to 2004
• Chrysler LHS — 1999 to 2001
• Chrysler Neon — 1994 to 1999
• Chrysler Neon — 2000 to 2005
• Chrysler PT Cruiser — 2001 to 2010
• Chrysler Sebring — 1995 to 2000
• Chrysler Sebring — 2001 to 2006
• Chrysler Stratus — 2001 to 2006
• Chrysler Town & Country — 2001 to 2007
• Chrysler Vision — 1993 to 1997
• Chrysler Voyager — 1995 to 2000
• Dodge Caravan / Grand Caravan — 2001 to 2007
• Dodge Dakota — 1997 to 2004

Note the two distinct generation breaks for the Neon and Sebring, which bridge a body-style changeover. Both generations use the same ID64 transponder and CY24 blade, though the pin-depth specifications for the mechanical cut may differ between generation one and generation two lock cylinders. Always reference the vehicle’s specific key code rather than copying an older key from the previous generation.

Programming Procedure Overview

The Chrysler SKIM system requires that each new transponder key be registered to the vehicle’s immobilizer module before the engine will crank. On most vehicles in the fitment list above, the standard method involves a diagnostic scan tool connected to the OBD-II port. The technician accesses the SKIM module, enters a secure key-programming mode, and then turns the ignition with the new key so the module can read and store the ID64 chip’s identifier.

Some model years within this range support an on-board programming shortcut if the owner already has two working keys. That procedure typically involves cycling both existing keys in the ignition within a timed window, then inserting the new blank so the SKIM accepts it as a third key. However, this shortcut is not universal — the PT Cruiser, for example, changed its SKIM configuration across production years. Confirming the exact procedure for the target vehicle and year before beginning avoids wasted time.

Locksmiths programming the transponder should verify that the SKIM module itself is functioning before cutting and coding a new blank. A failing SKIM can present symptoms that mimic a bad transponder — the security light flashes on the dashboard and the engine refuses to start, even with a correctly programmed key. On higher-mileage vehicles from this era, corroded antenna ring connections are a common failure point that should be inspected before replacing the key itself.

OEM vs. Aftermarket Considerations

Original equipment keys from Chrysler carried the ID64 Texas Instruments chip embedded during manufacturing and were pre-validated for the SKIM system. Aftermarket alternatives using the same ID64 chip and CY24 keyway are widely produced by third-party key blank manufacturers. When selecting an aftermarket blank, verifying that the transponder is a genuine Texas Instruments ID64 — rather than a clone chip marketed as ID64-compatible — reduces the likelihood of programming failures.

Clone chips can present intermittent issues where the key starts the vehicle initially but fails after the SKIM performs a deeper authentication cycle on subsequent starts. This behavior is particularly common on late-production PT Cruisers and Town & Country vans where the SKIM firmware was updated to reject certain non-TI transponder responses. Using a verified Texas Instruments chip eliminates this variable from the diagnostic process.

CY24 Blade Profile Details

The CY24 keyway is a single-sided edge-cut profile used broadly across Chrysler and Dodge vehicles of this period. It features a standard depth-and-spacing configuration that most automotive key machines handle without specialty tooling. Locksmiths cutting by code will reference the vehicle’s key code, typically stamped on a tag attached to the original key set or retrievable from the door or ignition lock using standard Chrysler decode tools.

The nickel-silver blade on quality aftermarket blanks should closely match the OEM thickness and tip stop dimensions. A blade that is slightly undersized can cause intermittent binding in the ignition cylinder, which creates a frustrating situation where the mechanical cut works but the key does not rotate smoothly enough to reach the transponder read position. Filing or shimming a marginal blade is not recommended — starting with an accurately dimensioned blank is always preferable.

When to Contact a Locksmith

Vehicle owners who need a replacement for this key have several paths. Dealerships can order and program the transponder through their service departments, though lead times and labor rates for SKIM programming tend to be higher than independent locksmith alternatives. Automotive locksmiths equipped with aftermarket diagnostic tools — such as the Autel IM608 or Advanced Diagnostics Smart Pro — can cut and program the key on-site, often at the vehicle’s location.

For vehicles in the fitment list above, the programming process is well-documented and generally takes under 30 minutes once the blank is cut. Mobile locksmith service is a practical option for owners dealing with a non-starting vehicle, since the entire process — key cutting, transponder programming, and ignition verification — can be completed roadside or in a parking lot without towing the vehicle to a shop.