2020 Peterbilt 389 Key Fob Programming Guide

Quick reference

Step-by-step on-board programming

The 2020 Peterbilt 389 does not support DIY on-board key fob programming. Programming of new key fobs for this vehicle requires a specialized scan tool, typically available at Peterbilt dealerships or through automotive locksmiths who specialize in heavy-duty truck systems. This is due to the advanced security systems and immobilizer technology integrated into modern commercial vehicles.

The programming process involves connecting a diagnostic scan tool to the vehicle's OBD-II port, then following a series of prompts on the scan tool to register the new key fob with the vehicle's computer. This ensures that only authorized fobs can start and operate the truck, enhancing security against theft.

Battery replacement

1. Locate the small notch or slot on the side of the key fob casing.
2. Carefully insert a small flat-head screwdriver or a coin into the notch.
3. Gently twist the screwdriver or coin to pry open the two halves of the fob casing.
4. Remove the old CR2032 battery, noting its orientation (positive side up).
5. Insert the new CR2032 battery, ensuring the positive (+) side is facing up.
6. Align the two halves of the key fob casing and press them firmly together until they snap shut.

Where to buy a replacement fob

• Peterbilt Dealership: This is often the most straightforward option for obtaining an OEM replacement fob, ensuring full compatibility and functionality. However, it is typically the most expensive, with fobs ranging from $150 to $300, plus programming costs of $100 to $200.
• Automotive Locksmith: Locksmiths specializing in truck keys can often provide and program aftermarket or even OEM-equivalent fobs at a more competitive price than dealerships. Fob costs can range from $75 to $150, with programming services costing around $75 to $150.
• Amazon/Online Retailers: You can find aftermarket key fobs from brands like Strattec (PN 5928810) and Dorman (PN 13915) on platforms like Amazon for significantly less, often in the $30 to $70 range. However, remember that these will still require professional programming. Be cautious of extremely cheap options, as their quality and compatibility can vary.

If on-board programming isn't supported

As established, the 2020 Peterbilt 389 requires specialized equipment for key fob programming. When considering a replacement, factor in both the cost of the key fob itself and the programming fee.

Your Peterbilt 389 also utilizes an immobilizer transponder system. This means that even if you have a new key fob, the transponder chip inside the key blade (if applicable) or integrated into the remote needs to be programmed to the vehicle's immobilizer system. Without this step, the truck will not start, regardless of whether the remote functions are working. Locksmiths and dealerships have the necessary tools to program both the remote functions and the transponder chip.

Expect total costs for a new fob and programming to range from $150 to $400, depending on where you purchase the fob and who performs the programming. Always verify that any aftermarket fob you purchase is compatible with your specific year and model of Peterbilt 389 and that the service provider can program both the remote and the transponder.

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