2020 International LT Key Fob Programming Guide

As an ASE-certified electrical technician and locksmith, I know that keeping a 2020 International LT on the road is critical for your bottom line. Heavy-duty trucks have evolved significantly, and modern Class 8 trucks like the International LT now feature integrated Remote Keyless Entry (RKE) systems and body control modules (BCM) that operate much like passenger vehicles. However, programming these systems is a different beast entirely.

If you have lost your fob, need a spare for a slip-seat operation, or are dealing with a dead remote, this guide will cover everything you need to know about replacing and programming your 2020 International LT key fob.

Quick reference

Note: Heavy-duty truck part numbers can vary heavily based on your specific VIN, fleet specifications, and BCM programming. Always verify with your local International dealership parts department using your VIN.

Item	Detail
FCC ID	Varies by VIN / Fleet spec (Check rear of existing remote)
OEM Fob PN	Varies by VIN (Navistar OEM)
Aftermarket Options	Limited; OEM recommended for Diamond Logic compatibility
Battery Type	CR2032
Programmable On-Board?	No (Requires Diagnostic Software)
Cuts Required?	Yes (For the physical ignition/door key)

Step-by-step on-board programming

Can you program the 2020 International LT key fob yourself? The short answer is no.

Unlike older passenger cars that let you cycle the ignition to pair a new remote, the 2020 International LT utilizes Navistar’s advanced Diamond Logic® electrical system. Because of the complex fleet management and security integrations on these trucks, there is no manual on-board programming procedure for the remote keyless entry.

To program a new key fob to your truck, the Body Control Module (BCM) must be put into learn mode using authorized diagnostic software (such as Navistar Engine Diagnostics or Diamond Logic Builder software) alongside a compatible heavy-duty datalink adapter (like a Nexiq USB-Link).

If you operate a fleet shop with access to DLB software:

1. Connect your datalink adapter to the 9-pin diagnostic port.
2. Launch the Diamond Logic Builder software and connect to the vehicle.
3. Navigate to the Body Control Module (BCM) settings.
4. Select the Remote Keyless Entry (RKE) programming function.
5. Follow the on-screen prompts to clear old remotes (if lost) and pair the new remotes by pressing the lock/unlock buttons when prompted by the software.

If you are an owner-operator without this software, you will need to hire a professional.

Battery replacement

If your current fob has stopped working or the range has significantly decreased, a dead battery is the most likely culprit. Replacing the battery in your International LT fob is a simple process that takes less than two minutes.

1. Locate the seam: Look for the small notch or seam along the edge of the remote casing.
2. Open the casing: Insert a small flathead screwdriver or a coin into the notch and gently twist to pry the two halves of the remote apart.
3. Remove the old battery: Carefully slide the old battery out of its retaining clip. Take note of which side is facing up (usually the positive "+" side).
4. Install the new battery: Insert a fresh CR2032 battery, ensuring the positive side is facing the same direction as the original.
5. Reassemble: Snap the two halves of the plastic shell back together, pressing firmly around the edges until it is fully sealed. Test the lock/unlock functions near the truck.

Where to buy a replacement fob

When replacing a heavy-duty truck fob, you have a few avenues, each with its own pros and cons:

• International Dealership:
  • Pros: Guaranteed to fit your exact VIN, guaranteed compatibility with your BCM.
  • Cons: Most expensive route. Expect to pay premium dealer pricing for the part, plus 1–2 hours of shop labor for programming. Total cost can easily range from $150 to $300+.
• Commercial Locksmith:
  • Pros: Mobile commercial locksmiths can come to your truck stop, yard, or breakdown location, saving you a tow or a massive detour. They usually charge less for labor than a dealership.
  • Cons: Not all automotive locksmiths have the 9-pin heavy-duty adapters or Navistar software required. You must verify they handle Class 8 trucks.
• Amazon / Online Retailers:
  • Pros: Parts are cheap.
  • Cons: Highly risky for commercial trucks. Heavy-duty aftermarket fobs are notorious for failing to pair with Diamond Logic systems. If you buy online, you still have to pay someone to program it, and they will likely not warranty the work if the cheap fob fails to pair.

If on-board programming isn't supported

Because the 2020 International LT requires a computer connection for key fob programming, you must factor in labor costs when planning your replacement.

Cost Expectations: If you purchase the fob yourself and hire a mobile commercial locksmith or take it to an independent heavy-duty repair shop, expect to pay between $75 and $150 just for the programming labor. The physical key blade is typically a standard commercial fleet key (unless specifically equipped with a rare immobilizer transponder system requested by a fleet), which is cheap to cut ($5–$15). However, getting the remote to talk to the truck's computer is where the software fees apply.

Immobilizer Transponder: Most standard Class 8 trucks rely on the physical cut of the key for the ignition and the remote for keyless entry, rather than a chipped passenger-car style transponder. However, if your fleet opted for enhanced security packages, the ignition may require a chipped key to be programmed alongside the remote via DLB.

Don't let a lost key sideline your freight. Find a mobile locksmith or shop on Repairius.