How to Program a 2017 Hyundai Elantra Key

You generally cannot fully program a 2017 Hyundai Elantra key (especially a new transponder or key fob) yourself without dealer-level or locksmith equipment; however, you can perform certain steps at home such as pairing a new remote (in some trims) and re-syncing an existing fob, while full key and immobilizer programming typically requires a professional. This article explains what you can do on your own, what must be done by a dealer or automotive locksmith, typical costs, and how to avoid common pitfalls.

Understanding Your 2017 Hyundai Elantra Key Type

The exact programming steps depend on which key system your 2017 Elantra uses. Hyundai offered several configurations for that model year, and each has different limitations on what an owner can do without specialized tools.

Main Key Types Used on the 2017 Hyundai Elantra

The following list outlines the main key styles you might have on a 2017 Elantra and how they generally work in terms of programming.

• Traditional key with immobilizer chip (blade key with remote on fob): A metal key that you insert into the ignition, usually paired with a separate remote on the same fob for lock/unlock and trunk. The car starts only if the built-in transponder chip is correctly programmed to the car’s immobilizer.
• Flip (switchblade) key with built-in remote: A key that folds into a plastic fob; buttons on the fob lock/unlock and control the trunk or panic alarm. Again, it includes an immobilizer chip that must be coded to the car.
• Smart key (push-button start / proximity key): No traditional key is used to start the engine. You carry a smart fob that lets you lock/unlock via touch sensors and start the car with a Start/Stop button. Programming these keys almost always requires dealer-level equipment or a qualified locksmith with Hyundai-compatible software.
• Emergency mechanical key (inside smart key fob): Even smart key fobs have a hidden metal key for manual door unlocking. This key usually must be cut, but does not itself contain a separate chip; the fob electronics handle the immobilizer function.

Identifying which of these systems you have is the first step in knowing what you can realistically do yourself versus what requires professional programming.

What You Can and Cannot Do Yourself

Many drivers assume they can program a new key to a 2017 Elantra by using “on-off” ignition sequences or door-open/close rituals found in older vehicles. On this model, that’s largely not possible for the immobilizer system; still, some remote functions and re-sync procedures may be owner-doable.

Typical Owner Capabilities

The following list summarizes what a typical owner can sometimes do at home, depending on trim and key type, using only the car and the current working keys.

• Re-sync an existing key fob: If your remote buttons have stopped working after a battery change but the car still starts, you can sometimes re-synchronize the fob to the car using simple steps (outlined below).
• Replace and test fob battery: You can open the key fob, install a new coin-cell battery (usually CR2032), and confirm that lock/unlock work from a distance.
• Cut a duplicate mechanical key (no chip): For the emergency key in a smart fob, some hardware stores can duplicate the metal blade for door unlocking only.
• Register a remote on some base models: On limited markets or lower trims with a simpler remote system, owners can occasionally add a new remote using ignition cycles and door lock sequences. This is less common on North American 2017 Elantra models but exists in some regions.

While these tasks can resolve many everyday issues, they do not give you the ability to fully code a fresh transponder key or smart key fob to the immobilizer system.

Tasks That Require Professional Tools

The next list describes jobs that typically cannot be done at home on a 2017 Elantra and need a dealer or a certified automotive locksmith with Hyundai-compatible diagnostic tools (e.g., GDS, GDS-M, or equivalent).

• Programming a brand-new transponder key: If the key itself has never been coded to any car, the immobilizer must be programmed with a scan tool and security PIN. This is required so the engine will recognize and start with the new key.
• Programming or adding a new smart key fob (push-button start): Adding or replacing a proximity key requires entering the vehicle’s security system, often with an online code or PIN. Hyundai treats this as a security function.
• Reprogramming after all keys are lost: If you have no working key, professionals may need to reset the immobilizer and program an entirely new set of keys. This is more complex and takes longer than simply adding an extra key.
• Immobilizer or BCM replacement: If the Body Control Module (BCM) or immobilizer unit is replaced, all keys and fobs usually must be registered again with dealer-level software.

Because of these built-in security measures, “complete at-home programming” of a fresh key for a 2017 Elantra is generally not realistic; owner involvement is usually limited to remote syncing, battery changes, and testing.

How to Re-Sync or Re-Initialize an Existing Key Fob

If your fob still starts the car but the lock/unlock buttons no longer work reliably—especially after changing the battery—it’s often enough to re-sync the remote to the vehicle. Hyundai does not publish a single universal method, but several procedures commonly work on 2017-era models.

Preliminary Steps Before Re-Syncing

Before you attempt to re-sync the key fob, it’s important to confirm a few basic conditions to avoid misdiagnosing an electrical or battery issue as a programming problem.

• Verify the fob battery: Install a new, brand-name coin cell of the correct type (commonly CR2032), ensuring proper polarity. Weak batteries can imitate programming failures.
• Check all doors and trunk: Make sure everything is closed firmly; some procedures fail if any door or the trunk is ajar.
• Disable aftermarket alarms/remote starters: These can interfere with the lock system during re-sync attempts. Use the original key only.
• Use a known-working key first: If you have two fobs, start with the one that most recently worked, then attempt the second after a successful re-sync.

If the fob still behaves erratically after following these checks, proceed to a re-sync sequence that matches your vehicle’s configuration.

Common Re-Sync Procedure for Elantra with Key Ignition

Owners of 2017 Elantras with a turn-key ignition (not push-button start) have reported success with the following re-sync routine. Note that this does not create a new key; it only re-bonds an already recognized fob to the car’s remote-lock system.

1. Sit inside the car: Close all doors and ensure they are locked from the inside, then unlock them using the power lock switch. Leave the driver’s door closed.
2. Insert the key in the ignition: Do not start the engine yet.
3. Turn key to ON (not start): Rotate to the “ON” position where the dash lights come on, but the engine is off.
4. Press the LOCK button on the fob: Hold it for 1–2 seconds, then release.
5. Turn the key back to OFF: Wait about 1–2 seconds.
6. Repeat ON → LOCK-button → OFF cycle: Perform this sequence 2–3 times in a row.
7. Finish and test: After the last OFF position, remove the key, exit the car, and test the remote lock/unlock from outside.

If this process succeeds, your remote buttons should respond more consistently. If not, you may be facing a hardware failure in the fob or a deeper issue in the vehicle’s receiver module.

Re-Sync Procedure for Smart Key (Push-Button Start)

For 2017 Elantras with a push-button start and proximity fob, re-sync options are more limited at home, but some owners can re-establish a basic connection when the fob starts the car intermittently.

1. Get inside with the fob: Sit in the driver’s seat with the smart key fob in your hand; close all doors.
2. Press the brake and push the Start/Stop button: Start the engine normally and let it run for 30–60 seconds.
3. Turn the engine off: Press the Start/Stop button again to switch off.
4. Move the fob close to the Start/Stop button: Hold it adjacent to or lightly touching the button.
5. Press the LOCK or UNLOCK button on the fob: Hold for a second or two while the fob is near the button.
6. Wait a few seconds and test: Step outside the vehicle, close the door, and test the smart entry (door handle sensor) and lock/unlock buttons.

This procedure does not formally “add” a new smart key, but it can re-establish a stronger handshake between an existing, recognized fob and the vehicle, especially after a battery replacement or a low-voltage event.

Programming a New Key Through a Dealer or Locksmith

When you need an additional key or have lost one, true programming of a 2017 Elantra key—both transponder and smart—almost always means visiting a Hyundai dealer or a professional automotive locksmith. The vehicle’s anti-theft system is designed so that unauthorized key creation is difficult without approved tools.

Typical Steps a Professional Takes

The list below outlines how a dealer or capable locksmith usually adds or replaces a key for a 2017 Hyundai Elantra.

1. Verify ownership: You must present identification and proof of ownership (registration, title, or insurance card) to comply with anti-theft regulations.
2. Identify the key type and part number: The technician checks your VIN and current key to determine the correct key blank, transponder chip, or smart key fob type.
3. Cut the mechanical blade: Using the VIN or decoding your existing key, they cut a new metal key or insert for your fob.
4. Connect diagnostic equipment: They hook up a Hyundai-compatible scan tool to the OBD-II port to access the immobilizer and Body Control Module.
5. Obtain security PIN / authorization: Through a secure system, the dealer or some locksmiths retrieve or generate a one-time security code for key programming.
6. Program the new key or fob: Using the scan tool, they add the new key’s transponder ID or smart key ID to the car’s memory, often with all keys present.
7. Test all functions: They verify that the new key starts the engine, that buttons lock/unlock the doors, and that proximity or trunk features work correctly.

This controlled process is why security-sensitive programming is not exposed to owners through simple menu options or key-turn sequences.

Costs and Time Frames

The list below provides broad price and time expectations (as of late 2024) for key programming on a 2017 Hyundai Elantra. Costs vary by region, dealer pricing, and parts availability.

• Standard transponder or flip key (dealer): Commonly in the range of $140–$250 USD total, including key, cutting, and programming.
• Smart key fob (push-button start): More complex; often $220–$400 USD or higher, depending on whether OEM or high-quality aftermarket parts are used.
• Automotive locksmith: Frequently competitive with or slightly cheaper than dealers, with mobile service that comes to your location, especially helpful if all keys are lost.
• All keys lost scenario: Expect a higher total, sometimes $250–$500+, because immobilizer reset, PIN access, and on-site service add time and complexity.

Calling several local dealers and licensed automotive locksmiths with your VIN is the most reliable way to get an accurate quote tailored to your location and trim level.

DIY Possibilities Using Aftermarket Tools

Some owners look to aftermarket key-programming tools or online marketplaces to avoid dealer costs. For a 2017 Elantra, this approach has strict limits and real risks if misused.

What Aftermarket Devices Can (Sometimes) Do

The following list describes potential capabilities of advanced DIY tools available to consumers, though success is not guaranteed and may vary by firmware, region, and production date of the vehicle.

• Clone an existing transponder: Some key-cloning devices and locksmith-grade machines can copy the chip data from a working key onto a new blank, effectively duplicating it.
• Program simple remotes: Certain lower-end Hyundai systems allow remote button programming without full immobilizer access; some devices help automate this process.
• Read key information: A few OBD-based tools can read stored key counts and IDs to verify how many keys are currently programmed to the vehicle.

Even when tools can technically work, they require experience, and a mistake can lock you out of the immobilizer or corrupt the key list, forcing a dealer-level reset.

Risks and Limitations of DIY Programming Tools

Owners should consider the following limitations and potential downsides before investing in or attempting use of non-professional tools on a 2017 Elantra.

• Firmware and compatibility issues: Many budget tools are not updated for all immobilizer versions; a 2017 Elantra built late in the model year may differ from early builds.
• Security lockouts: Incorrect attempts to access the immobilizer can trigger security timers, lockouts, or error codes, requiring a dealer visit to clear.
• No support or warranty: If you damage the BCM or immobilizer through unsupported programming, Hyundai is unlikely to cover repairs under warranty.
• Counterfeit keys and fobs: Very cheap online keys can have low-quality electronics or incompatible chips, leading to intermittent failures or total non-recognition.

For many owners, especially those who are not experienced with automotive electronics, the apparent savings of DIY tools can vanish quickly if a professional must undo or repair a failed programming attempt.

Practical Tips Before You Go to the Dealer or Locksmith

Preparation can reduce both time and cost when programming a 2017 Elantra key, whether you go to the dealer or use a mobile locksmith service.

Information to Gather in Advance

Before scheduling key programming, collect the following pieces of information to streamline the process and ensure the correct parts are ordered.

• Vehicle Identification Number (VIN): Usually visible at the base of the windshield on the driver’s side and on the registration documents.
• Build date and trim level: Found on the driver’s door jamb sticker and in your owner’s manual; helpful for confirming key type.
• Existing key count and types: Note how many working keys or fobs you have and whether they are flip, standard, or smart keys.
• Part number on your current fob: Often printed on the back cover or inside the fob; matching this can prevent incompatible replacements.

Providing these details up front allows the service provider to check stock, quote more accurately, and avoid surprises on the day of programming.

Best Practices to Minimize Future Key Problems

After you have a new key or fob working properly, the next list offers preventive steps to avoid future lockouts and extra programming costs.

• Always keep at least two working keys: When you still have one good key, adding another is faster and cheaper than starting from zero after a loss.
• Store a spare in a secure location: Keep a backup key at home or with a trusted person rather than leaving it in the car.
• Replace fob batteries proactively: Every 2–3 years, or sooner if range decreases, install a fresh, quality coin-cell battery.
• Avoid dropping or soaking fobs: Impacts and water damage are common causes of remote failure; use a protective case if you’re rough on keys.

These basic precautions can significantly reduce emergencies and the expense of last-minute towing or on-site locksmith visits.

Summary

Programming a 2017 Hyundai Elantra key is partly owner-manageable and partly locked behind professional tools. You can usually change the fob battery, re-sync an existing remote, and, in a few cases, pair basic remotes yourself. However, adding a completely new transponder or smart key, or recovering from a situation where all keys are lost, almost always requires a Hyundai dealer or qualified automotive locksmith with the proper diagnostic equipment and security authorization. Verifying your exact key type, gathering vehicle details in advance, and maintaining at least two working keys are the most effective ways to keep key programming straightforward, secure, and reasonably priced.