2019 International MV Key Fob Programming Guide

As an ASE-certified electrical technician and locksmith, I get a lot of questions about commercial and medium-duty truck keys. The 2019 International MV is a workhorse, utilizing Navistar’s Diamond Logic electrical system. Unlike standard passenger vehicles, medium-duty trucks like the International MV are heavily customized based on fleet specifications. While many rely on a standard mechanical ignition key without an immobilizer, some are equipped with factory Remote Keyless Entry (RKE) or aftermarket fleet security systems.

Here is your comprehensive guide to understanding, programming, and replacing the key fob and keys for your 2019 International MV.

Quick reference

Item	Detail
FCC ID	Varies by fleet spec (Factory RKE vs Aftermarket)
OEM Fob PN	Varies by VIN / Diamond Logic configuration
Aftermarket Options	Universal heavy-duty fleet RKE systems
Battery Type	CR2032 (Most common for RKE fobs)
Programmable On-Board?	No (Requires Diamond Logic Builder / Module Access)
Cuts Required?	Yes (For the mechanical ignition key)

Note: Navistar/International does not use a single universal FCC ID or Part Number for the MV series, as RKE is an optional add-on module rather than standard equipment. Always check your specific RKE module or contact an International dealer with your VIN to get the exact part numbers.

Step-by-step on-board programming

Because the 2019 International MV is a commercial truck utilizing the Diamond Logic multiplex system, there is no standard DIY on-board programming procedure (such as turning the ignition on and off multiple times) for factory key fobs.

Depending on how your MV was upfitted, the programming process generally falls into one of two categories:

1. Factory RKE Systems (Diamond Logic): If your truck was built with Navistar's factory RKE system, programming a new fob requires heavy-duty diagnostic software.

1. Connect a Nexiq USB-Link or similar heavy-duty diagnostic interface to the 9-pin diagnostic port under the dash.
2. Launch International's Diamond Logic Builder (DLB) software on your connected laptop.
3. Navigate to the Body Controller module and access the RKE parameters.
4. Follow the software prompts to clear old remotes and pair the new fob to the vehicle's receiver.

2. Aftermarket/Upfitter Fleet Systems: Many fleets install their own RKE modules under the dash.

1. Locate the RKE receiver module (commonly zip-tied or mounted near the steering column or fuse panel under the dash).
2. Press and hold the "Learn" or "Program" button on the module until the LED indicator flashes.
3. Press any button on your new key fob. The LED on the module will typically turn solid or flash rapidly to confirm pairing.
4. Turn the ignition on to exit programming mode and test the fob.

Battery replacement

If your current fob is acting up, a dead battery is the most likely culprit. Most heavy-duty fobs use a standard CR2032 coin battery.

1. Locate the seam running along the side of the key fob plastic housing.
2. Insert a small flathead screwdriver or plastic pry tool into the seam and gently pry the two halves apart.
3. Remove the green circuit board and carefully push the old battery out of its retaining clip.
4. Insert the new CR2032 battery with the positive (+) side facing up.
5. Snap the two halves of the plastic casing firmly back together and test the remote.

Where to buy a replacement fob

Finding a replacement fob for a commercial truck is different from buying one for a Honda or Ford. Here are your options:

• International Dealer: This is the most reliable option for factory RKE systems. By providing your VIN, the parts department can order the exact Diamond Logic-compatible fob. Expect to pay between $100 and $250 for the part, plus an hour of labor for programming.
• Commercial Locksmiths: Locksmiths specializing in heavy-duty trucks can often source and program these fobs. They usually travel to your yard, saving you a trip to the dealership. Prices typically range from $150 to $300 total.
• Online/Amazon: You can find universal RKE systems and replacement fleet fobs online very cheaply ($20-$50). However, unless you have an aftermarket system with a physical "Learn" button on the module, you will not be able to program these yourself without Diamond Logic Builder software.

If on-board programming isn't supported

As mentioned, most factory configurations of the 2019 International MV do not support DIY on-board programming. If your fleet mechanic does not have the Diamond Logic Builder software and a heavy-duty diagnostic link, you will have to outsource the job.

Fortunately, the ignition keys on most International MVs are standard mechanical keys (without immobilizer transponder chips). This means that while you might need software to program the keyless entry fob, any standard locksmith or hardware store can cut a spare ignition key for just a few dollars, ensuring you are never fully locked out of operating the vehicle.

If you are dealing with a lost fob and lack the software to pair a new one, don't waste time trying standard passenger-car pedal dances or ignition cycles. Call in a pro with the right commercial diagnostic tools.

Find a mobile locksmith or shop on Repairius.