2021 International LT — Key Fob Programming
AI-generated reference. Always verify torque values, fluid capacities, intervals, and procedures against the manufacturer's service manual or OEM repair information before performing work. Repairius is not liable for damage from acting on this content without verification.
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Quick reference
| Item | Detail |
|---|---|
| FCC ID | N5F-A08TAA |
| OEM Fob PN | 3848801C4 |
| Aftermarket Options | Strattec 5928160; Dorman 973-102 |
| Battery Type | CR2032 |
| Programmable On-Board? | No – Requires specialist scan tool |
| Cuts Required? | Yes, for integrated key models |
Step-by-step on-board programming
Unfortunately, the 2021 International LT does not support DIY on-board programming for its key fobs. Programming requires specialized diagnostic equipment and software, which is typically only available to authorized International dealerships or qualified automotive locksmiths. This process usually involves connecting a scan tool to the vehicle's OBD-II port and performing a programming sequence to pair the new key fob with the vehicle's immobilizer system.
Battery replacement
- Locate the small notch or slot on the side or bottom of the key fob.
- Insert a small flathead screwdriver or coin into the notch and gently twist to pry open the two halves of the fob casing.
- Carefully remove the old CR2032 battery. Note the orientation (+/-).
- Insert the new CR2032 battery with the positive side facing up.
- Align the two halves of the fob casing and press them firmly together until they click securely into place.
Where to buy a replacement fob
- International Dealership: While you're guaranteed an authentic OEM part, this is usually the most expensive option. Expect to pay anywhere from $150 to $300 or more for the key fob itself, plus an additional $100-$150 for programming and cutting (if applicable).
- Automotive Locksmith: Locksmiths often offer a more cost-effective solution. They can typically source aftermarket fobs (like Strattec or Dorman, which are often identical in function to OEM but without the brand markup) and program them for you. Expect to pay $100-$250 total, including programming and cutting.
- Online Retailers (Amazon, eBay, etc.): You can often find aftermarket key fobs for a significantly lower price (e.g., $20-$80). However, be cautious of counterfeit products. The challenge here is that you'll still need to factor in the cost of programming from a locksmith or dealer, as DIY programming is not an option for this vehicle. If your fob includes an integrated key blade, you'll also need to get it cut.
If on-board programming isn't supported
Since the 2021 International LT requires specialist programming, you'll need to budget for professional services. The cost can vary based on your location and the specific service provider. Typically, you're looking at a total cost of $100 to $300 for a new key fob, programming, and key cutting (if required).
Immobilizer Transponder: The key fobs for the 2021 International LT contain an immobilizer transponder chip, which is crucial for starting the vehicle. This chip communicates with the vehicle's immobilizer system, and if it's not correctly programmed, the engine will not start, even if the key blade fits the ignition. This is why specialized programming equipment is necessary; it ensures the transponder chip is properly synced with your truck's system.
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More specs for the 2021 International LT
Oil Capacity & Filter
Capacity, weight, filter PN, drain plug torque, change interval.
Fluid Type Specs
Engine oil, coolant, ATF, diff, brake, PS, DEF — with OEM spec numbers.
Coolant Capacity & Type
Total system capacity, OEM coolant spec, flush interval, bleed tips.
Transmission Fluid & Service
Trans model, fluid spec, capacity, filter PN, service interval.
Torque Specifications
Lug nuts, drain plug, caliper, axle nut, plug, key fasteners.
Brake Pad & Rotor Specs
Pad PNs, rotor size, min thickness, caliper torque.
Tire Size & Pressure
OEM size, cold psi, bolt pattern, wheel size, TPMS.
Battery Size & Group
Group size, CCA, AGM/flooded, dimensions, reset note.
A/C Refrigerant & Oil
R-134a or R-1234yf, charge oz, PAG oil spec.
Bulb Sizes (Headlight, Tail, Fog)
Headlight, fog, tail, turn, reverse, interior.
Factory Maintenance Schedule
Service intervals by mileage, severe-duty notes, known issues.
Towing Capacity & Payload
Max tow, payload, GVWR/GCWR, hitch class by trim.
Fuse Box Diagram & Amperage
Fuse box locations, layout, amps, and what each fuse controls.
Serpentine Belt Routing & Length
Belt routing, length, rib count, OEM + aftermarket PNs.
Wheel Alignment Specifications
Camber, caster, toe ranges (front & rear), adjustability notes.
Paint Color Codes
All factory colors with paint codes, sticker location, touch-up tips.
Wiper Blade Sizes
Driver/passenger/rear blade size, attachment, OEM + cross-refs.
Spark Plug Type & Gap
Plug PN, gap, torque, interval by engine.
Transmission & Axle Gear Ratios
Trans gear ratios, axle ratios, RPO codes, tow vs MPG impact.
Same spec — other model years
Maintenance & repair guides
2021 International LT Maintenance Schedule →
Available maintenance guidance; confirm the manufacturer schedule.
Repair planning references →
Plan the scope of work; detailed procedures need configuration-matched evidence.
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