Step-by-step guide to program new keys for a Ram Heavy Duty (2019-2024) using LAUNCH X431. Covers prerequisites, security access, troubleshooting, and FAQs.

Quick Answer: All-Keys-Lost Programming on a 2019-2024 Ram 2500/3500 Using LAUNCH X431

If you’ve lost every factory key for your Ram Heavy Duty, programming a new one with a LAUNCH X431 is possible but requires a paid immobilizer subscription, internet access, and a stable 12V power supply. The process involves connecting to the Chrysler SPS server to calculate a security code, then writing new key IDs directly to the BCM. Without the correct subscription, the tool will fail at the security access step. Expect to spend 20–40 minutes for the full procedure.

1. Understanding the Challenge: The Ram HD Immobilizer System

Why “All Keys Lost” is Different on 2019–2024 Rams

The term “all keys lost” does more than describe a frustrating situation—it defines a specific technical barrier. On older vehicles, you could often bypass the immobilizer by cycling the ignition a certain number of times. Not on these modern Rams.

Security architecture: These trucks use a Sentry Key Immobilizer System (SKIM) that integrates the Body Control Module (BCM) and the RF Hub (Radio Frequency Hub) mounted under the dash. The BCM stores the unique IDs of every learned key. When you have zero keys, you cannot authenticate yourself to the BCM through normal means.

The J2534 pass-through requirement: Unlike older models, 2019+ Rams demand communication through the J2534 pass-through protocol. This means the diagnostic tool must talk directly to Chrysler’s SPS (Service Programming System) servers to calculate the required security seed. The LAUNCH X431 can do this, but only with the right software subscription and hardware.

The two-key rule: In a typical dealer procedure, you need at least two existing keys to program a third. The LAUNCH tool overrides this by directly writing key IDs into the BCM’s EEPROM—but only after the server-side authentication completes. Get that step wrong, and the whole process stalls.

2. Prerequisites: What You Need Before Starting

Tool & Subscription Checklist

Before you even open the truck door, verify you have the following:

LAUNCH X431 device: A current-generation model such as the X431 PAD VII, V+, EURO Pro, or equivalent. Older tablets may lack the processing power or memory for this procedure.
Active Immobilizer subscription: This is non-negotiable. The basic diagnostic subscription won’t work. You need the “Immobilizer” or “Key Program” package, typically sold as an annual plan or per-vehicle credits.
J2534 hardware module: Some LAUNCH kits include a dedicated pass-through box. If yours doesn’t, you may need to purchase it separately. The tool uses this module to bridge communication with the Chrysler server.
Stable internet connection: The encryption calculation happens on the cloud, not on your tablet. Use Wi-Fi or a reliable mobile hotspot.

Vehicle & Safety Setup

Fully charged battery with a maintainer: Voltage drops during security initialization can corrupt the BCM. Connect a battery charger (14 amps minimum) directly to the terminals. Don’t rely on the truck’s alternator at idle—it’s not stable enough.
Proper blank keys: You need uncut transponder keys with the correct chip type. For 2019–2024 Ram HD trucks, this is typically a 46-chip (PATS type) or a newer 4D-69 chip. Verify your specific year and trim before buying blanks. If the key blade is cut but the transponder is new, it will still work—but if you’ve lost all keys, you’ll need a dealer or automotive locksmith to cut the blade using your VIN.

3. Step-by-Step: All-Keys-Lost Programming with LAUNCH X431

Step 1: Connect and Launch the Software

Plug the LAUNCH X431 diagnostic cable into the OBD-II port (located under the driver-side dash).
Turn the ignition key to the ON position. Do not start the engine.
Power up the LAUNCH tablet and wait for the home screen.
Navigate to Diagnostics > Immobilizer. Avoid using the “Auto Scan” function—it takes longer and can confuse the module selection.
Select USA > Ram > Ram 2500/3500 (2019–2024) .
Choose All Keys Lost from the menu. Do not select “Add Key” or “Key Programming” unless you have at least one working key.

Step 2: Perform Security Access (Server Connection)

The tool will prompt you to “Read BCM” or “Enter Security Code” . Select Read BCM/ECU Information first. The display will show the VIN and module part numbers.
The X431 will now attempt to contact the Chrysler SPS server. You’ll see a message like “Requesting Security Code from Server…”
Ensure your subscription is active. If not, the tool will return a “Function Not Available” error.
Wait 2–5 minutes. The server calculates a unique seed-key based on your VIN, BCM serial number, and other encrypted parameters.
If successful, the screen reads “Security Access Granted.” If it fails, check your internet connection, subscription status, and battery voltage. A drop below 12.0V during this step is a common cause of failure.

Step 3: Program the First Key

After security access is granted, the tool will instruct you to “Insert New Key.”
Take your first blank transponder key and insert it into the ignition. Turn it to the ON position.
The tool attempts to write the key ID to the BCM. This process takes about 10–20 seconds.
Do not turn the ignition off during this write cycle. Leave it in ON until the screen confirms “Key Learned Successfully.”
If you see “Key Not Learned” or “Communication Failure,” remove the key, wait 10 seconds, reinsert, and try again. A weak transponder or poor connection can cause this.

Step 4: Program Additional Keys (Optional)

The tool will ask: “Do you want to learn another key?” Select Yes.
Remove the first key and insert the second new key. Turn to ON.
Wait for confirmation.
You can program up to 8 keys total. When finished, select No.
The tool will finalize the programming cycle, which may involve a BCM reset or a brief ignition-cycle countdown.

Step 5: Exit and Test

Turn the ignition off. Wait 30 seconds for the system to stabilize.
Turn the key to the START position. The engine should crank and fire.
Test remote functions (lock/unlock on the key fob, if your key includes remote entry). If the remote doesn’t work, see the FAQ below.

4. Troubleshooting Common Issues

Issue 1: “Function Not Available” or “Connection to Server Failed”

Cause: Your LAUNCH X431 lacks the correct immobilizer subscription, or the device firmware is outdated.

Fix: Go to the LAUNCH Store within the X431 software and update your immobilizer module. You may need to purchase a one-time “All Keys Lost” credit if your subscription doesn’t cover this function.

Issue 2: “Security Access Denied” After Entering VIN

Cause: Incorrect VIN entry, or the server doesn’t recognize your subscription for that specific VIN range.

Fix: Double-check the VIN from the door jamb sticker—don’t rely on memory. If your subscription is a “lifetime” plan, some packages limit the number of VINs per month. Contact LAUNCH support for a token reset.

Issue 3: Key Learned, But Engine Cranks and Won’t Start

Cause: The transponder chip is the wrong type (e.g., 4D-60 instead of 46-chip), or the BCM didn’t save the key ID properly due to a voltage drop during the write.

Fix:

Verify the chip type with a transponder reader (like KEYDIY or Xhorse tools).
Re-run the “All Keys Lost” procedure. This is safe even with a valid key already learned—but keep the battery charger connected.
If it still fails, the BCM may have corrupt memory. Try a BCM Hard Reset: disconnect the negative battery cable for 30 minutes, then retry the procedure.

Issue 4: “J2534 Device Not Found”

Cause: Your LAUNCH kit lacks the necessary pass-through box, or the USB/Bluetooth connection is unstable.

Fix: Ensure the J2534 module (if separate) is powered and properly connected. On integrated tablets, navigate to Settings > J2534 > Enable. If the problem persists, you may need a third-party J2534 pass-through device (like a Drewtech Mongoose or OEM link cable) used in conjunction with the LAUNCH tablet.

5. Important Considerations & The “Last Resort” Option

When the LAUNCH X431 Won’t Work

No tool is perfect. Here are situations where you may need to pivot:

Corrupt BCM: If the tool reads the BCM but can’t even retrieve the VIN, the module may be faulty. This requires replacement and dealer-level programming.
Software version lock: LAUNCH occasionally pushes server-side updates. If an update went live the night before, your procedure may fail until you download the latest firmware on your X431 tablet.
Geolocation restrictions: Some LAUNCH subscriptions are region-locked. If you imported a Ram from the US to Europe, the server may reject the VIN. Check with your supplier before attempting.

The Dealer Alternative

If you’ve attempted the LAUNCH procedure twice without success, the safest bet is the Chrysler dealer. They use WiTech (the official J2534 software)—the gold standard that other tools try to replicate. Expect to pay $100–$200 USD for the programming labor, plus the cost of the keys. It’s not cheap, but it avoids the risk of bricking the BCM.

6. FAQ: All-Keys-Lost Programming for Ram HD 2019–2024

Q: Can I use a LAUNCH X431 to program a key if I have one working key?

A: Yes. For the “Add Key” procedure, you typically don’t need a server subscription on many X431 versions. The “All Keys Lost” function is what requires the cloud connection. If you have one working key, the process is simpler, faster, and cheaper.

Q: How much does the LAUNCH X431 subscription cost for immobilizer programming?

A: Prices vary by region and package. Expect to pay $100–$300 USD per year for the Immobilizer module. Some distributors offer per-vehicle credits (e.g., 5 credits for $50). The basic diagnostic subscription does not include immobilizer functions.

Q: Will this procedure work on a Ram 4500/5500 (Chassis Cab)?

A: Generally, yes. The immobilizer system is similar across the HD lineup (2500–5500). However, the BCM software may differ. Look for a specific “Chassis Cab” option in the software when selecting your vehicle model.

Q: What if I program the keys, but the remote keyless entry (RKE) doesn’t work?

A: The LAUNCH X431 primarily programs the immobilizer chip (start function). On some Rams—especially lower trims—the remote locking functions are separate. You may need to perform a Remote Keyless Entry programming procedure, often done by cycling the ignition a specific number of times. The X431 may have a separate “Program Remote” function, or you can try the manual procedure: insert the key, turn to ON, press and hold the unlock button for 10 seconds, then release.

Q: Is it safe to turn off the ignition or disconnect the battery during programming?

A: Absolutely not. Doing so can corrupt the BCM, requiring a full module replacement and dealer recovery. Always use a battery charger and never interrupt the process once it begins.

Q: My LAUNCH X431 says “This function requires a higher level subscription.” What do I do?

A: You’re likely running the immobilizer tool bundled with a free trial. You must purchase the full Immobilizer package. Contact LAUNCH customer support to upgrade your account—they can process the payment and activate the feature remotely.

Published: June 16, 2026

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/

All-Keys-Lost Programming 2019-2024 Ram 2500/3500 with LAUNCH X431