Mechanic Wiki: Program 2018+ Ram Smart Key with LAUNCH X431

Learn how to program a 2018+ Ram smart key using LAUNCH X431. Step-by-step guide for OBD & PIN methods, troubleshooting tips, and compatibility info.

Published/Last Updated: June 21, 2026

Quick Answer: Programming a 2018+ Ram Smart Key with LAUNCH X431

You can program a new smart key fob to a 2018+ Ram truck using a LAUNCH X431 diagnostic tool (X431 Pro, V+, PAD, etc.) by accessing the Immobilizer/Key Programming function via the vehicle’s OBD-II port. The process typically takes 5–10 minutes, requires a valid existing key (for some models) and a blank compatible key, and involves: connecting the tool, selecting the correct Ram model and year, choosing “Key Programming” under Special Functions, following on-screen prompts to erase all keys, and programming the new ones. If you have two working keys, many models allow OBD key programming without a PIN code; otherwise, you need a 4-digit security PIN from a dealer or PIN retrieval service. Always confirm your LAUNCH X431 software is updated and that the tool supports Chrysler/Ram IMMO functions.

Understanding the 2018+ Ram Smart Key System

Modern Ram trucks (1500, 2500, 3500, and Promaster vans from model year 2018 onward) use a sophisticated smart key system that goes beyond a traditional mechanical key. Instead of turning a blade in the ignition, you simply press a “Start” button while the key fob is inside the cabin. This system relies on a Radio Frequency Hub (RF Hub) module that communicates with the key fob and the vehicle’s Body Control Module (BCM) or Security Gateway Module (SGW) on newer models.

The LAUNCH X431 communicates with these modules through the OBD-II port. For 2018+ Rams, the CAN bus network is encrypted and often protected by a security gateway. That’s why a high-end diagnostic tool like the LAUNCH X431 is necessary—it can authenticate with the modules and access the immobilizer programming functions. Lower-end generic OBD scanners cannot perform key programming because they lack the required software and security protocols.

Which LAUNCH X431 Models Support Ram Key Programming?

Not every LAUNCH X431 variant has the Chrysler/Ram immobilizer functions. Models that typically include IMMO support are:

X431 Pro V+ (and Pro V+ 4.0)
X431 PAD VII / PAD VII Elite
X431 V+ 4.0
X431 Euro Pro (with FCA package)
X431 HD III (for heavy-duty trucks, but includes Ram pickup support)

If you own an older or entry-level X431 model (like the Diagun or the X431 Creader), you may lack full key programming capability. Check your tool’s software package under “Chrysler/Ram” or “Immobilizer” before proceeding.

What You Need Before Starting

Programming a smart key on a modern Ram demands more than just the scan tool. Here’s a checklist to avoid mid-process frustration.

LAUNCH X431 with up-to-date software: Your tool must have the latest Chrysler/Ram database installed (DBScar or equivalent). Some functions require an active subscription (IMMO or FCA package). Log into your X431 account and verify coverage for 2018–2024 Ram models.
Blank smart key(s): Use an OEM key or a high-quality aftermarket key that matches the correct FCC ID. For 2018+ Ram, common FCC IDs include M3N40821302 (for 2018–2021) and M3N44219702 (for 2022+). Check the original key’s FCC ID sticker.
Existing valid key(s): If you have two working keys, you can use the OBD key programming method without a PIN. With only one key or none, you’ll need the PIN code.
4-digit security PIN: Required when you cannot use the OBD method. Obtain it from a Ram dealer (you’ll need proof of ownership and VIN) or use your LAUNCH X431’s PIN retrieval function (requires online credits or a subscription).
Stable vehicle battery: A battery voltage below 12.6V can cause communication errors during programming. Connect a battery maintainer if necessary. Also ensure the key fob has a fresh battery (CR2032 type).
Doors closed, ignition off initially. Follow the tool’s instructions for when to turn the ignition on.

Step-by-Step Programming Procedure Using LAUNCH X431

I’ve performed this procedure on a 2019 Ram 1500 and a 2022 Ram 2500. The steps are nearly identical across model years, but watch for slight menu naming differences depending on your LAUNCH software version.

1. Connect and Initialize

Plug the LAUNCH X431 into the OBD-II port located under the driver’s side dashboard. Turn the ignition ON (engine off) but do not start the engine. On push-to-start models, press the Start button once without pressing the brake.

From the LAUNCH home screen, tap Diagnosis. Then navigate: American → Ram → select your model (e.g., 1500, 2500, 3500). Next, choose the correct Model Year (2018–2024) and Engine Type. The tool will download the vehicle’s system information automatically.

2. Navigate to Key Programming

Once the system scan completes, you’ll see a list of available control units. Look for either:

Special Functions (common on newer X431 interfaces)
Immobilizer or Anti-Theft System
Body Control Module (then find “Program Keys” sub-menu)

Select Key Programming or Program Immobilizer. The tool may present two methods: OBD Key Programming (for when two existing keys are available) or PIN Code Entry (for one key or zero keys).

3. OBD Key Programming (with Two Existing Keys)

This is the easiest method because no PIN is required. The LAUNCH X431 will walk you through:

Step 1: Insert the first existing key into the ignition (or place it near the start button for push-to-start) and turn to RUN. The tool recognizes the key and confirms “Key 1 Learned.”
Step 2: Remove the first key and insert the second existing key. Turn to RUN. The tool confirms “Key 2 Learned.”
Step 3: Now the tool asks you to program the new blank key. Insert the new key and turn to RUN. The system learns it and displays “Key 3 Programmed Successfully.”
Step 4: Repeat if you have additional keys (up to eight total). After the last key, the tool will exit programming mode.

Turn the ignition off, remove the tool, and test all keys. If any key fails to operate remote functions or start the engine, repeat the process—all keys must be programmed in one session.

4. PIN Code Method (with One or Zero Keys)

If you don’t have two existing working keys, you must enter the 4-digit PIN. Here’s how it goes:

Obtain the PIN (see next section). Once you have it, the LAUNCH tool will prompt you to input the PIN.
The tool then formats the RF Hub/Security module. This erases all previously learned keys.
Program each key individually: Insert the first key (or hold it near the start button) and turn to RUN. The tool will say “Program Key 1.” Wait for confirmation. Repeat for each additional key.
After the last key, the tool exits and the module restarts. Test all keys.

Tip: If you have only one key that works, program it first, then immediately program the new second key. That way you end up with two working keys for future OBD programming sessions.

5. Verify Operation

After the tool says “Programming Complete,” turn the ignition off and disconnect the LAUNCH X431. Test each key systematically:

Lock and unlock doors using the fob buttons.
Press the Start button to start the engine.
Check passive entry: with the key in your pocket, touch the door handle to lock/unlock.
Test remote start (if equipped) by pressing the remote start button twice.

If any function fails, you may need to reprogram the key again or check for additional BCM settings (see Troubleshooting below).

Troubleshooting Common Issues

Even with a good tool and fresh keys, things can go sideways. Here are the most common problems I’ve encountered and how to resolve them.

“Communication Error” or “Device Not Supported”

Verify the OBD connector is fully seated. Sometimes a loose connection causes the tool to lose communication mid-procedure.
Ensure your LAUNCH X431 has the latest Chrysler/Ram software. Log in to your X431 account and check for updates.
On 2022+ Rams, you may need a Security Gateway bypass cable if your X431 model does not have built-in SGW support. The LAUNCH PAD VII includes this bypass; older models require an external cable.

“No Keys Programmed” or “Key Not Learned”

The key fob battery might be weak. Replace it with a fresh CR2032 battery.
Hold the key fob directly against the Start button during the programming prompt. This positions the transponder close to the reader coil.
Try a different blank key. Some aftermarket keys are not compatible even if they look the same. Stick with OEM or well-reviewed aftermarket brands.

PIN Code Required But Not Available

If you don’t have the PIN and you cannot use the OBD method (no two existing keys), you must obtain it. Your LAUNCH X431 may offer a PIN Retrieval function. This typically requires an active IMMO subscription or credits. Navigate to Special Functions → PIN Retrieval → follow prompts. The tool will calculate the PIN from the VIN or by reading the RF Hub.
If your tool cannot retrieve the PIN, contact a Ram dealer. Provide your VIN and proof of ownership. Some dealerships charge a fee ($20–$50) for the code.
Third-party online services can also supply the PIN for a small fee using your VIN.

Tool Freezes During Programming

Do not interrupt the process if possible. If the tool freezes, disconnect it, turn the ignition off, wait 30 seconds, then restart from the beginning.
Low vehicle battery voltage is a common cause. Connect a battery charger or jumper pack to keep voltage stable during programming.
Disable any aftermarket electronics (alarms, remote starters, GPS trackers) that may interfere with CAN communication.

After Programming, Old Keys Stop Working

This is expected. The programming session erases all previously learned key IDs. You must program every key you want to use (including old ones) in the same session. If you forgot to program an old key, you’ll have to start the process again.

Vehicle Starts but Remote Functions Fail

Remote functions (lock/unlock, remote start) are handled by the BCM or RFA module, not just the immobilizer. If the engine starts but remote functions don’t work, you may need to run a BCM Configuration or RFA Learn procedure via the LAUNCH X431. Look under Body Control → Programming → Learn Remote Controls. This is a separate process from immobilizer key programming.

Topical Depth: Related Considerations

Differences Between 2018–2021 and 2022+ Ram Key Systems

For 2022 model year, Ram introduced a Security Gateway Module (SGW) on many trucks to comply with anti-theft regulations. This module blocks direct diagnostic access unless the scan tool can authenticate with it. LAUNCH X431 PAD VII has built-in SGW bypass; older X431 models may require an external SGW bypass cable (available from LAUNCH or Autel). The key programming procedure remains the same, but you must connect the bypass cable between the OBD port and the tool.

Cost Comparison: LAUNCH X431 vs. Dealer vs. Locksmith

Dealer programming: Typically $100–$200 for labor plus $150–$300 per OEM key. Total easily exceeds $400.
Automotive locksmith: $80–$150 for programming plus key cost (often $50–$100 for aftermarket).
DIY with LAUNCH X431: The tool costs $500–$2,000 depending on model (if you don’t already own one), but blank keys cost $20–$70. If you already have the tool, you save the labor fee. For workshops or frequent DIYers, the LAUNCH pays for itself after a few jobs.

Can You Program a Used Key?

Yes, if the key was previously used on another vehicle, its ID is already stored in that vehicle’s RF Hub. However, the LAUNCH X431 can erase all learned keys from the target Ram and then learn the used key as a new key. The procedure is the same as programming a new blank key. Just make sure the used key has the correct FCC ID and is not damaged.

What If You Lose All Keys?

If you have zero working keys, you still can program new keys using the LAUNCH X431—but you absolutely need the PIN code. Without the PIN, even a dealer may need to replace the RF Hub. The LAUNCH X431 cannot bypass the PIN; it can only use it. So store your PIN somewhere safe after you retrieve it.

Software Subscription Requirements

Some LAUNCH X431 models require an active IMMO or FCA software package to enable key programming. This is often an annual subscription ($100–$300 per year). Check your tool’s account page. If you only need it for one job, consider a one-month subscription if available.

Comprehensive FAQ

Q1: Is the LAUNCH X431 compatible with 2018–2024 Ram 1500?

Yes, most LAUNCH X431 models (Pro, V+, PAD, V2.0, etc.) support Chrysler/Ram IMMO functions, including key programming for all Ram trucks and vans from 2018 to 2024. Confirm your tool has the latest Chrysler/Ram software installed, and that your tool model includes immobilizer functions (not all entry-level models do).

Q2: Can I program a Ram smart key without any existing key?

Yes, but you will need the 4-digit security PIN code. Without an existing key, you cannot use the OBD method. The LAUNCH X431 can program new keys even if all keys are lost, as long as you have the PIN. You can obtain the PIN from a dealer or try the tool’s PIN retrieval function.

Q3: How do I get the PIN code for my Ram?

You can get the PIN from a Ram dealer by providing your VIN and proof of ownership. Some LAUNCH X431 models have a “PIN Retrieval” feature that calculates the PIN by reading the RF Hub or VIN (requires online credits or subscription). Third-party services also offer PIN retrieval online for around $15–$30.

Q4: Will programming with LAUNCH X431 erase my old keys?

Yes. When you start the programming session, the tool will erase all previously learned keys from the vehicle’s module. You must program all keys you want to use (including all existing keys) during that same session. If you forget one, you’ll have to repeat the entire process.

Q5: My LAUNCH X431 says “Function Not Supported.” What should I do?

Update your tool’s software to the latest version. Ensure you selected the correct vehicle model, year, and engine. If it still says “Function Not Supported,” your LAUNCH model may not include Chrysler IMMO functions. You may need to upgrade to a higher-tier model like X431 Pro V+ or PAD VII, or purchase an add-on software package.

Q6: Can I program a remote start function through the key programming?

Key programming handles the immobilizer and basic remote functions (lock/unlock). If remote start is already enabled in the vehicle’s BCM (common on 2018+ Rams), the new key should work. If remote start does not work after key programming, you may need to enable remote start via the LAUNCH X431’s BCM configuration menu—a separate procedure.

Q7: Do I need a bypass cable for 2022+ Ram?

Many 2022+ Chrysler/Jeep/Ram vehicles use a Security Gateway Module (SGW) that blocks direct OBD access. The LAUNCH X431 PAD VII has built-in SGW bypass. For other X431 models, you will need an additional SGW bypass cable (commonly sold as a “SGW bypass cable for Chrysler/Jeep/Ram”). Without it, the tool may not be able to communicate with the immobilizer module.

Q8: How long does the programming process take?

Typically 5–10 minutes if using the OBD method with two existing keys. If you need to use the PIN method or retrieve the

Program 2018+ Ram Smart Key with LAUNCH X431 | Step-by-Step Guide