Continental Automotive Transponder Key (chip PCF7941A) – Y170 Blade

By Mohammad H. Abdelhadi, ALOA-Certified Master Locksmith, mobile automotive locksmith. Reviewed by Ray Obar, Master Locksmith. Updated June 1, 2026.

Built around an NXP PCF7941A transponder chip and cut on a Y170 blade profile, the Continental Automotive Transponder Key (chip PCF7941A) serves as the immobilizer-authenticated ignition key for select Chrysler-group vehicles. This unit is identifiable by its uncut Y170 high-security keyway, a sidewinder-style blade that must be precision-milled before use. Inside the key head sits the PCF7941A integrated circuit, responsible for responding to the vehicle’s immobilizer interrogation during every start cycle. Compatible vehicles—specifically the 2013–2026 Dodge Dart—share Chrysler’s proximity-based immobilizer architecture that relies on this chip family for cryptographic handshake validation. A correctly enrolled Continental Automotive Transponder Key (chip PCF7941A) will allow the engine control module to release the fuel injector and ignition circuits within milliseconds of the key entering the barrel and turning to the run position. The device carries FCC ID M3N32297100, linking it to federally certified radio-frequency emissions testing under Continental Automotive’s registration.

PCF7941A Chip Architecture and Immobilizer Function

The NXP PCF7941A is a combined transponder and remote-control IC that integrates a Hitag2-compatible crypto engine on a single die. In this particular application the transponder portion handles the passive, inductively powered exchange between the key head coil and the antenna ring surrounding the ignition lock cylinder. When the driver inserts the key and rotates to the “on” position, the antenna ring energizes the embedded coil, powering up the PCF7941A. The chip then transmits a rolling cryptographic response derived from a shared secret stored during the original programming event. If the engine control module validates the response, the immobilizer releases its hold on the fuel and spark systems.

The PCF7941A’s dual-function design means the same silicon handles both the passive transponder challenge-response and, where applicable, any remote-keyless-entry signaling routed through a separate RF section. In a standalone transponder key like this one—where no remote buttons are present on the key shell—the RF transmitter section may remain unpopulated or unused, and the FCC ID M3N32297100 pertains to the transponder’s low-frequency emissions profile rather than a high-frequency keyfob broadcast.

Continental Automotive Transponder Key (chip PCF7941A) – Y170 Blade Details

The Y170 keyway is a high-security internal-cut (sidewinder) profile used across several Chrysler-platform vehicles. Unlike traditional edge-cut keys, the Y170 features a serpentine milling track on the flat face of the blade, requiring a specialized code-cutting machine such as an Ilco Futura series, Keyline Ninja, or comparable CNC key machine. Locksmiths should verify the key code against the vehicle’s VIN-derived bitting data before cutting, because an improperly milled Y170 blade can damage the wafer tumblers inside the lock cylinder.

The blade blank must be sourced in the correct thickness and width to seat properly in the Dodge Dart’s ignition housing. Aftermarket blanks are widely available, but technicians should confirm that the transponder cavity in the bow accommodates the PCF7941A glass capsule or wedge-mount package without modification. A loose chip seat can shift the transponder coil away from the antenna ring’s optimal coupling zone, leading to intermittent no-start conditions that mimic a dead battery or failed starter relay.

Vehicle Fitment: 2013–2026 Dodge Dart

The validated fitment for this key is the Dodge Dart produced from model year 2013 through 2016. The Dart used Chrysler’s immobilizer system paired with the Y170 lock cylinder across all trim levels during this production window. When programming a replacement Continental Automotive Transponder Key (chip PCF7941A) to a Dart, the technician must use a diagnostic tool capable of accessing the Chrysler Secure Gateway Module (SGM) on 2018-and-later platforms—but because the Dart’s production ended in 2016, it predates the SGM lockout and can typically be programmed through the standard OBD-II diagnostic port using tools such as Autel IM608, SmartPro, or Chrysler’s wiTECH platform.

The programming sequence generally involves reading the immobilizer module’s existing key data, adding a new key slot, and writing the PCF7941A’s unique identifier into the approved key table. Some diagnostic platforms require a valid working key to be present during the add-key procedure; others support proxy-based enrollment when no working key is available, though the latter scenario often requires a PIN code derived from the vehicle’s VIN through the OEM database.

Programming Considerations for Locksmiths

Before beginning any transponder enrollment on a 2013–2026 Dodge Dart, technicians should confirm that the vehicle’s battery is fully charged and stable—voltage drops during the programming handshake can corrupt the key registration and require a module reset. A battery support unit clamped to the terminals is standard practice.

The Continental Automotive Transponder Key (chip PCF7941A) should be verified as “virgin” (unprogrammed) before enrollment. A previously enrolled PCF7941A that was bound to a different vehicle’s immobilizer cannot be re-registered to a new VIN without specialized erase procedures, and some diagnostic tools do not support chip-level erasure on NXP Hitag2-family devices. Sourcing confirmed-virgin transponder keys eliminates this risk.

After successful registration, the technician should cycle the ignition through at least three full start-and-run sequences to confirm stable communication between the newly enrolled key and the engine control module. Intermittent transponder reads on the first attempt—sometimes caused by marginal coil coupling—tend to stabilize after the initial learning period, but persistent failures point to a physical chip-seating issue or a damaged antenna ring.

OEM vs. Aftermarket Quality Considerations

Continental Automotive, a division of Continental AG, is the original equipment manufacturer for this transponder key. OEM-sourced units carry the factory-correct PCF7941A with verified firmware revision and coil tuning matched to the Dodge Dart’s antenna ring specifications. Aftermarket clones using the same NXP PCF7941A die are available at lower price points and are generally compatible, but locksmiths should verify that the clone’s coil inductance falls within the OEM specification window. Out-of-spec coils can reduce read range from the typical 10–15 mm to under 5 mm, creating marginal start conditions in cold weather when the steering column contracts slightly and shifts the key position relative to the antenna ring.

For vehicle owners, the practical takeaway is straightforward: a qualified automotive locksmith with the correct diagnostic equipment can program this key on-site, usually in under thirty minutes. Dealership programming is also an option but typically involves higher labor rates and may require the vehicle to be towed in if no working key is available.

Related help: Dodge auto locksmith, car key replacement, car key programming.

Compatible and related keys: Continental Automotive Smart Key Fob (FCC ID M3N40821302), compatible Bosma Remote Head Key (FCC ID KOBDT04A), Lear 3-Button Remote Key Fob (FCC ID GQ43VT17T) (compatible fob), Lear 3-Button Remote Key Fob (FCC ID GQ43VT9T), Lear Remote Head Key (compatible fob), related key: Lear Transponder Key (chip PCF7941).