2025 International MV Key Fob Programming Guide

As an ASE-certified electrical technician and locksmith, I get a lot of questions about modern commercial truck security systems. The 2025 International MV is a staple in the medium-duty truck market, trusted for hauling, towing, and delivery. However, when it comes to key and remote programming, commercial trucks operate a bit differently than your standard passenger vehicles.

Because fleet security is paramount, the days of easily adding keys to your truck via a simple ignition-cycling sequence are long gone. Below is everything you need to know about replacing, programming, and maintaining the key fob and transponder key for your 2025 International MV.

Quick reference

Item	Detail
FCC ID	Varies by build sheet/VIN (Consult dealer)
OEM Fob PN	Varies by fleet spec (Check body controller module)
Aftermarket Options	Limited (Heavy-duty specific platforms)
Battery Type	CR2032
Programmable On-Board?	No (Requires commercial scan tool/DLB)
Cuts Required?	Yes (Physical ignition blade)

Note: Navistar (International) uses highly customized fleet builds. Your exact FCC ID and Part Number will depend on whether your MV was ordered with the Diamond Logic advanced electrical system remote entry features. Never guess—always use your VIN to verify.

Step-by-step on-board programming

If you are hoping to program a new key or fob for your 2025 International MV using a DIY "insert key, cycle on/off" procedure, you will be disappointed. There is no DIY on-board programming procedure for the 2025 International MV.

Because the MV is a commercial vehicle, its security protocols are tied deeply into the Diamond Logic Builder (DLB) software and the vehicle's Body Control Module (BCM). To program a new fob or transponder key, you must use a specialized diagnostic scan tool capable of communicating with heavy-duty J1939/J1708 protocols and accessing the truck's secure gateway.

Here is how the procedure is performed by a professional:

1. Connect the heavy-duty diagnostic interface to the truck’s 9-pin diagnostic port.
2. Launch Navistar Engine Diagnostics (NED) or Diamond Logic Builder software (depending on the security module architecture).
3. Access the BCM / Security Module parameters.
4. Select the routine to "Add/Learn Remote Fob" or "Program Transponder Key."
5. Follow the on-screen prompts, which typically involve holding the new fob near the receiver or cycling the ignition with the freshly cut transponder key.
6. Clear any generated security fault codes.

Do not attempt to bypass this with standard automotive scan tools, as passenger-car software will not communicate with the International MV's heavy-duty electrical architecture.

Battery replacement

Even heavy-duty fobs need maintenance. If your range is dropping or the truck occasionally fails to recognize the remote, it is time for a new battery.

1. Locate the seam: Look along the edge of your remote fob for a small indentation or slot.
2. Pry open the shell: Use a small flathead screwdriver or a plastic trim tool to gently pry the two halves of the fob apart.
3. Remove the old battery: Note the orientation of the battery (usually the positive "+" side faces down). Carefully slide out the old CR2032 battery.
4. Install the new battery: Insert a fresh CR2032 battery, ensuring the positive side is facing the correct direction.
5. Snap it shut: Line up the two halves of the plastic shell and press them firmly together until they click into place. Test the fob.

Where to buy a replacement fob

When replacing a commercial truck key, you have a few distinct routes:

• Commercial Truck Dealership (International/Navistar):
  • Pros: Guaranteed to match your exact VIN and fleet spec.
  • Cons: Most expensive route, and you will have to tow or drive the truck to the dealer.
  • Ballpark Price: $150–$300 for the part, plus $150+ for programming labor.
• Heavy-Duty Locksmith:
  • Pros: They can come to your yard or breakdown location. They have the specialized tools to cut heavy-duty blanks and program Diamond Logic modules.
  • Cons: Finding a mobile locksmith specializing in class 6-7 trucks can sometimes be tricky.
  • Ballpark Price: $200–$350 total (includes mobile service, cutting, and programming).
• Amazon / Online Retailers:
  • Pros: Parts are cheap ($20–$50).
  • Cons: Highly risky for commercial trucks. Fleet specs vary so wildly that generic heavy-duty remotes often fail to pair. You still have to pay a professional to program it.

If on-board programming isn't supported

As established, on-board DIY programming is not an option for the 2025 MV. If you lose your keys or want to issue a spare to a new driver, you must budget for professional programming.

The truck's immobilizer system uses an encrypted transponder chip embedded in the key head. If a key is cut but not programmed to the ECM/BCM, the engine will crank but will not start, or the starter may be locked out entirely. Expect to pay between $200 and $400 for a heavy-duty locksmith to provide the key, cut the blade, and program the transponder and remote via their diagnostic laptop.

If you are a fleet manager, it is highly recommended to have at least three programmed keys per truck at all times to avoid expensive downtime.

Find a mobile locksmith or shop on Repairius.