Step-by-step guide to program a new key fob for your 2019-2024 Ram 1500 push-to-start using LAUNCH X431. Includes prerequisites, troubleshooting, and FAQs.

How to Add a Key Fob to a 2019–2024 Ram 1500 Push-to-Start with LAUNCH X431

Last Updated: June 16, 2026

Quick Answer

Adding a key fob to a 2019–2024 Ram 1500 with push-to-start using a LAUNCH X431 scanner requires the tool’s immobilizer (IMMO) function. You will need two already-programmed keys to add a third (or more) fob via the security access procedure. Connect the scanner, select IMMO > Key Programming, follow on-screen prompts to learn the new fob, and test all functions. If you have zero working keys, you must contact a professional locksmith—this consumer-level procedure won’t work from scratch.

Why You Might Need to Add a Key Fob

Modern push-to-start systems are incredibly convenient—until you lose a fob. Here are the most common reasons Ram 1500 owners look up this procedure:

Lost or damaged original fobs – They’re expensive to replace through a dealership ($300–$500 each), so DIY programming saves serious cash.
Purchasing a used vehicle with only one key – That single fob is a ticking time bomb. If it fails, you’re stranded. Having a spare gives peace of mind.
Wanting a spare for convenience or resale value – A Ram 1500 with two working fobs sells faster and for a higher price than one with a single fob.
Replacing a failing key fob battery – Sometimes the fob itself goes bad even after a battery swap. Learning a new one is the permanent fix.

Compatibility Notes

Vehicle Models

This guide covers the 2019, 2020, 2021, 2022, 2023, and early 2024 Ram 1500 models. It works for both the DS (Classic) and DT (newer body) platforms across all trims including:

Ram 1500 Classic, Rebel, Laramie, Limited
Big Horn / Lone Star, Tradesman, Longhorn

The push-to-start system on these trucks uses a CAN-based immobilizer that the LAUNCH X431 communicates with through the OBDII port.

LAUNCH X431 Scanner Compatibility

Not every LAUNCH X431 unit can handle key programming out of the box. You need:

Hardware: LAUNCH X431 V+, X431 Pro, X431 PAD VII, X431 Elite, X431 Euro Tech, or X431 IMMO Plus
Software: IMMO or ProKey module (often sold separately—check your software package)
Internet connection: Required for VIN scanning, database lookups, and security PIN retrieval
Potential extra fee: Some older X431 units require a one-time unlock fee for the IMMO function

If you just bought a used X431 and can’t find the IMMO menu, update the device and check your subscription status. Many users discover the hard way that key programming software isn’t included in the base package.

Prerequisites Before You Start

Gather everything you need before sitting in the driver’s seat. Nothing kills momentum like realizing you’re missing a critical item.

Two existing working key fobs – This is non-negotiable for a DIY add-a-key procedure. The security system demands two authorized fobs before it allows a third to be learned.
New blank key fob – Buy an OEM Mopar fob if possible. Aftermarket fobs sometimes work, but I’ve seen many fail during the learning process. Your Ram 1500 uses either a 433 MHz or 902 MHz fob depending on the market. Check the original fob’s FCC ID to match the frequency.
LAUNCH X431 with a fully charged battery – A dying scanner mid-programming can corrupt the immobilizer data. Charge it overnight before starting.
Stable internet connection – Wi-Fi or mobile hotspot. The X431 needs to talk to its server to retrieve the security access PIN.
Key cut (if your fob has an emergency blade) – A locksmith can cut the physical key from code. The immobilizer programming is the main goal, but you’ll want the blade to match the door lock.
Patience – Budget 15–30 minutes for the first attempt. If anything goes wrong, don’t rush the retry.

Warning: If you have zero working keys, stop here. This procedure will not help you. A push-to-start Ram 1500 without any programmed fobs requires dealer-level tools like the Autel IM508 or Xhorse Mini Prog. The LAUNCH X431 consumer version cannot create a first key from scratch for these vehicles. Contact an automotive locksmith.

Step-by-Step Programming Guide using LAUNCH X431

Step 1: Prepare the Vehicle and Tool

Close all doors, the hood, and the tailgate. Ajar sensors can confuse the immobilizer system.
Sit in the driver’s seat with both existing key fobs and the new blank fob within easy reach.
Start the engine if possible. If the truck is a push-to-start, place one existing fob near the start button and press the button without your foot on the brake to turn the ignition to Run/ON. The dashboard should light up.
Turn on the LAUNCH X431 and confirm it has internet access.

Step 2: Connect the Scanner

Plug the OBDII cable into the diagnostic port under the dashboard, left of the steering column near the hood release lever.
On the X431 home screen, tap Diagnostics, then select AutoScan. Alternatively, manually choose Ram > RAM 1500.
Wait for the scanner to read your VIN automatically. It will load the correct vehicle data and software modules.

Step 3: Navigate to IMMO / Key Programming

From the main menu, select IMMO (Immobilizer). On some software versions, this is labeled Key Coding or ProKey.
In the IMMO submenu, choose Key Learning or Program New Key. The exact wording varies by X431 software version, but the path is always under immobilizer functions.
The tool will now attempt to retrieve the security access PIN using your VIN. This step requires an active internet connection and takes about 1–2 minutes. Do not interrupt it.
If the PIN is auto-filled, proceed. If prompted to enter it manually, type the code displayed on screen. Some Ram 1500 models show the PIN in a pop-up after retrieval.

Step 4: Initiate Key Programming

The X431 will now walk you through a precise key-learning sequence. Follow each prompt exactly:

Place the first working key fob near the push-to-start button. You might need to hold it directly on the button or within an inch of it. Wait for the scanner to confirm “Key 1 Learned.”
Remove that fob and place the second working key in the same spot. Wait for confirmation.
Now place the new blank fob near the button. The scanner will attempt to learn it. A message like “Programming Successful” should appear.
If prompted to test the new key, turn off the ignition and press the start button with the new fob near the button. The engine should crank and start.

Step 5: Test and Finalize

Disconnect the LAUNCH X431 from the OBDII port.
Test the new fob thoroughly:
- Lock and unlock all doors
- Press the panic button
- Activate remote start (if equipped)
- Try the tailgate release (if equipped)
Verify that the emergency blade (if present) physically unlocks the driver’s door.

If all functions work, you’re done. If the engine starts but remote functions don’t work, the body control module (BCM) may need a reset. We’ll cover that in troubleshooting below.

Troubleshooting Common Issues

Problem	Likely Cause	Solution
Scanner cannot connect to vehicle	OBD port issue, vehicle not in correct ignition state	Recheck the OBD connection; ensure ignition is ON (engine running is okay); reboot the X431
“No IMMO function found”	Software not installed or vehicle not supported	Confirm your X431 subscription includes IMMO/Key Coding; update the tool’s software
“Security Access Denied”	Wrong PIN or communication error	Wait 2–3 minutes before retrying; verify internet connection; try retrieving the PIN again
Programming fails during key learning	New fob not recognized or dead battery	Replace the new fob’s battery with a fresh CR2032; hold the fob directly against the start button; ensure it’s the correct OEM frequency
Only two keys can be programmed (spare not added)	Immobilizer memory may be full (rare; Ram allows up to 8 keys)	This is uncommon. You may need to delete all keys and re-learn them using a dealer-level tool
Remote start stops working after programming	Immobilizer reprogramming can reset BCM settings	Use the X431 to check Remote Start settings in the BCM module; reset if needed

A real-world tip from experience: I’ve seen several cases where the new fob programs successfully for ignition but the remote lock/unlock buttons don’t respond. This often means the fob’s RF (radio frequency) pairing didn’t complete. Return to the IMMO menu and look for an option like “Synchronize Remote” or “Learn Remote RF.” Run that subprocedure separately.

Frequently Asked Questions

Q: How many key fobs can I program for my Ram 1500? A: Up to eight keys can be stored in the vehicle’s immobilizer system. That includes the original fobs and any you add later.

Q: Do I need a special blank key? A: Yes. The fob must be compatible with Chrysler’s CAN-based immobilizer system. OEM Mopar fobs are best, but high-quality aftermarket blanks (like those from Strattec) also work. The emergency insert blade can be cut by a locksmith using your VIN or existing key code.

Q: Will this work for a 2019 Ram 1500 Classic? A: Yes. The 2019 Ram 1500 Classic (DS) and the 2019+ DT model both use similar push-to-start RFID systems. The LAUNCH X431 covers both platforms. Verify your tool’s software database is up to date before starting.

Q: Does the LAUNCH X431 need software updates? A: Absolutely. Always check for the latest IMMO software before attempting key programming. Some updates require a paid license—check your subscription plan.

Q: What if I lose the security access PIN after programming? A: The PIN is unique to your vehicle’s VIN. You can retrieve it again through the LAUNCH X431’s online database anytime, as long as you have an internet connection.

Q: Can I program a used (previously programmed to another vehicle) key fob? A: Possibly, but only if the fob is a “blankable” or “reusable” model. Many Chrysler fobs cannot be unpaired from their original vehicle. You can try—if the learning step fails, the fob is likely locked and you’ll need a new blank.

Q: What is the alternative if I don’t have two working keys? A: You must contact an automotive locksmith or a Ram dealership. The LAUNCH X431 consumer version cannot generate a first key for a push-to-start Ram. Professional tools like the Autel IM508 can, but that’s a separate investment.

Q: Is there a risk of bricking the immobilizer? A: The risk is very low as long as you follow on-screen prompts exactly. Never disconnect the scanner during programming. If the tool freezes, wait 10 minutes, then restart the X431 and begin the IMMO procedure again.

Q: How long does the key fob battery last? A: Typically 2 to 4 years. Use a CR2032 lithium battery. New fobs often have a plastic pull-tab to activate the battery—remove it before attempting to program.

Final Tips for a Smooth Experience

Update your LAUNCH X431 firmware and software before you even pull the OBD cable out of the case. An outdated tool fails more often than it succeeds.
Buy OEM fobs if you can. Aftermarket fobs are tempting at half the price, but I’ve seen a 30–40% failure rate in real-world use. Spend the extra $30 and avoid the headache.
Fully charge the scanner. A low battery warning mid-programming is a nightmare scenario. Charge it to 100% the night before.
If you need to add keys from scratch (zero working keys), do not attempt this with a consumer X431. Professional locksmith tools like the Autel IM508 or Xhorse Mini Prog are required for first-key generation on push-to-start Rams. Save yourself the frustration and hire an expert.

About the Author: Erwin Salarda is an Automotive Service Equipment Technician based in the Philippines, specializing in computerized automotive diagnostic equipment such as OBD scanners and wheel alignment systems. Since 2012, he has been actively providing technical support, equipment installation, troubleshooting, after-sales service, and hands-on training for automotive service equipment used by workshops and automotive professionals.

He has received specialized training from international suppliers and manufacturers, including Launch X431 in Shenzhen, China, Lawrence Engineering Company in Guangzhou, China, and 3Excel Wheel Alignment Company in Shenzhen, China. Through these trainings, he developed advanced expertise in automotive diagnostics, calibration, wheel alignment systems, and computerized automotive service technologies.

Erwin Salarda provides professional after-sales support and technical training for automotive diagnostic and wheel alignment equipment, helping clients maximize the performance and proper use of their tools and systems. His experience covers equipment setup, software updates, calibration procedures, troubleshooting, and operational guidance for automotive workshops and service centers.

With more than a decade of experience in the automotive equipment industry, Erwin Salarda continues to support automotive businesses by delivering reliable technical expertise and practical training solutions.

For inquiries and equipment purchases, please visit https://carlifterph.com/

How to Add Key Fob to 2019-2024 Ram 1500 Push-to-Start with LAUNCH X431