2022 Kenworth T680 Key Fob Programming Guide

As an ASE-certified electrical technician and locksmith, I get a lot of questions about modern heavy-duty truck keys. The 2022 Kenworth T680 is a highly advanced piece of equipment, and its electrical system, governed by the PACCAR body control module (CECU/B-CAN), reflects that. If you are looking to replace or program a key fob for your 2022 Kenworth T680, you have stepped out of the realm of traditional DIY passenger car programming and into the world of commercial fleet diagnostics.

Here is everything you need to know about replacing, programming, and maintaining the keyless entry remote for your T680.

Quick reference

Note: Heavy-duty truck manufacturers frequently update receiver modules. Always verify your specific OEM part number using your truck's VIN at a Kenworth parts counter before purchasing a remote.

Step-by-step on-board programming

Unlike older passenger vehicles or light-duty trucks, the 2022 Kenworth T680 does not support on-board, DIY programming (such as cycling the key in the ignition or pressing a combination of pedals).

Because the keyless entry system is tied directly into the PACCAR multiplexed electrical system, adding a new remote requires digital authorization.

How it is actually programmed:

1. Connect Diagnostic Tool: A technician must connect a Nexiq USB-Link (or equivalent interface) to the truck's 9-pin diagnostic port.
2. Launch PACCAR ESA: The technician opens the PACCAR Electronic Service Analyst (ESA) software on their diagnostic laptop.
3. Access the CECU: The software connects to the Cab Electronic Control Unit (CECU).
4. Enter Programming Mode: The technician navigates to the "Program Remote" function within the ESA parameters.
5. Sync the Fob: Following the on-screen prompts, the technician will press the lock/unlock buttons on the new fob so the CECU can register its unique frequency and digital signature.
6. Save and Test: The parameters are saved to the truck's module, and the remote is tested for lock, unlock, and auxiliary functions.

Attempting to find a "DIY workaround" for a 2022 T680 will only lead to frustration. You must have access to commercial diagnostic software.

Battery replacement

If your current fob is simply losing range or acting intermittently, you likely just need a new battery. The T680 fob takes a standard CR2032 lithium coin cell battery.

1. Locate the small notch on the seam of the plastic key fob case.
2. Insert a small flathead screwdriver or a plastic pry tool into the notch and gently twist to split the two halves of the shell apart.
3. Note the orientation of the old battery (usually the "+" side faces down toward the back cover).
4. Remove the dead battery and insert the new CR2032 battery in the exact same orientation.
5. Snap the two halves of the plastic shell back together tightly to ensure the weather-resistant seal is intact.
6. Test the remote next to your truck. (Replacing the battery will not erase the fob's programming).

Where to buy a replacement fob

When dealing with a 2022 Kenworth, your procurement options are slightly different than a standard passenger vehicle:

• Kenworth Dealership:
  • Pros: Guaranteed to give you the correct part based on your VIN. They have the PACCAR ESA software on hand to program it immediately.
  • Cons: Most expensive route.
  • Price: $150–$250 for the fob, plus 1 hour of diagnostic labor (often $150+ per hour).
• Commercial/Heavy-Duty Locksmiths:
  • Pros: Mobile service means they can come to the truck stop, yard, or weigh station. Often cheaper labor rates than the dealer.
  • Cons: Not every automotive locksmith has commercial truck software (like PACCAR ESA or Jaltest). You must verify they handle heavy-duty trucks.
  • Price: $200–$300 total (parts and labor).
• Amazon / Online Retailers:
  • Pros: Parts are sometimes cheaper.
  • Cons: Very high risk of buying the wrong frequency or an incompatible aftermarket clone. You still have to pay someone with the software to program it, and many shops refuse to program customer-supplied electronics.

If on-board programming isn't supported

As established, you cannot DIY this process. If you lose all your keys on the road, you are looking at a commercial mobile lockout situation.

It is also important to note that depending on how your specific fleet spec'd the truck, it may be equipped with an immobilizer system (transponder key). If the truck has an immobilizer, cutting the physical key blade is not enough to start the engine; the transponder chip inside the head of the key must also be programmed to the truck's ECU. If the key has a chip, the diagnostic tool is required for both the keyless entry remote and the engine immobilizer.

Don't stay stranded at the yard or on the shoulder. Find a mobile locksmith or shop on Repairius.