2020 Kenworth W900 Key Fob Programming Guide

As a cornerstone of the American trucking industry, the Kenworth W900 is built for the long haul — and the security of your rig is paramount. Whether you've lost a key fob, are dealing with a dead battery, or simply want a spare, this guide covers everything you need to know about programming and replacing the remote for your 2020 Kenworth W900.

Unlike many passenger vehicles, modern heavy-duty trucks like the W900 have robust electronic security systems that require specialized tools for key and fob programming. Don't worry — we'll walk you through the process, your options, and what to expect.

Quick reference

Item	Detail
FCC ID	GOH-PCGEN2
OEM Fob PN	A26-1044 (Paccar)
Aftermarket Options	Strattec 5923256, various online clones
Battery Type	CR2032
Programmable On-Board?	No, requires diagnostic scan tool
Cuts Required?	Yes, the ignition key is separate and must be cut.

Step-by-step on-board programming

For 2020 and similar model years, the Kenworth W900 does not have a Do-It-Yourself (DIY) or on-board programming procedure for new key fobs. This isn't an oversight; it's a critical security feature.

Programming a new remote must be done by connecting a specialized diagnostic scan tool to your truck's OBD-II port. This tool communicates with the Cab Electronic Control Unit (CECU), which is the brain behind your truck's cab functions, including the keyless entry and immobilizer system.

Why is a tool required?

The programming process involves the scan tool initiating a "learn mode" in the truck’s computer. The tool then sends the unique security ID of the new fob to the CECU, authorizing it to communicate with the truck. This prevents unauthorized individuals from easily programming a new key and driving away with your valuable asset.

Therefore, to add a new fob, you must visit a Kenworth dealership or a certified automotive locksmith who has the necessary Paccar-compatible diagnostic equipment (such as the DAVIE4 diagnostic platform).

Battery replacement

If your fob has stopped working or has a diminished range, the first and easiest step is to replace the battery. This does not require reprogramming. You will need one CR2032 coin battery.

1. Locate the seam: Look around the edge of the fob for a small indentation or seam where the two halves of the plastic casing meet.
2. Gently pry open: Insert a small flathead screwdriver or a coin into the seam and gently twist to pop the case open. Work your way around if necessary, but be gentle to avoid cracking the plastic.
3. Swap the battery: Note the orientation of the old CR2032 battery (+ side up/down) before removing it. Place the new battery in the exact same orientation.
4. Snap it shut: Align the two halves of the fob casing and press them firmly together until they snap shut.
5. Test: Stand near your truck and test the lock and unlock functions.

Where to buy a replacement fob

You have several options for sourcing a new remote, each with its own pros and cons.

• Kenworth Dealership: This is the most straightforward, albeit most expensive, option. They will provide a genuine OEM Paccar fob and have the tools and expertise to program it to your truck correctly. Expect to pay $150 - $300+ for the fob and the programming labor.

• Automotive Locksmith: A well-equipped automotive locksmith, particularly one specializing in commercial vehicles, is an excellent alternative. They often have the same diagnostic tools as a dealer but can offer more competitive pricing and the convenience of mobile service. Ballpark cost is typically $100 - $250, including the fob and programming.

• Online (Amazon, eBay, etc.): You can find OEM and aftermarket fobs online for a fraction of the dealer cost, often in the $20 - $50 range. This is the cheapest way to get the hardware, but you will still need to hire a dealer or locksmith to program it. Beware of counterfeit or low-quality remotes that may fail to program or break down prematurely.

If on-board programming isn't supported

As mentioned, the lack of a DIY programming option is a security feature. The keyless entry system on your W900 is tied to the engine immobilizer. The CECU needs to recognize a valid, pre-programmed fob before enabling all vehicle systems.

When a technician programs a new fob, their diagnostic tool puts the truck into a secure learning mode. At this point, all existing remotes are erased from the truck's memory. This is why it's crucial to bring all your fobs (old and new) to the programming session. The technician will then program them back into the system one by one.

This process ensures that if a fob was stolen, it can be erased from the system, rendering it useless. The cost for this programming service alone (if you bring your own fob) can range from $70 to $150, depending on the provider and their labor rates.

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Your Kenworth W900 is a professional-grade machine with professional-grade security. While you can't program a new fob yourself, understanding the process helps you make the most cost-effective decision. For professional help, find a mobile locksmith or shop on Repairius.