2015 Freightliner M2 106 Key Fob Programming Guide

As an ASE-certified electrical technician and locksmith, I see a lot of medium-duty trucks roll through the shop. The 2015 Freightliner M2 106 is a staple in the commercial fleet world. When it comes to key fobs and keyless entry on these trucks, things are a bit different than your average passenger car. Depending on how the truck was spec'd from the factory or by the upfitter, it may have a standard mechanical key, or a factory remote keyless entry (RKE) system.

Here is your comprehensive guide to handling key fob programming and replacements for the 2015 Freightliner M2 106.

Quick reference

Item	Detail
FCC ID	Varies by RKE option (Check back of existing fob or verify via VIN)
OEM Fob PN	Requires VIN verification (Commonly A06-series modules)
Aftermarket Options	Limited; usually requires OEM or heavy-duty specific replacements
Battery Type	CR2032 (most common for factory/dealer remotes)
Programmable On-Board?	No
Cuts Required?	Yes, physical key blade must be cut to the ignition lock cylinder

Step-by-step on-board programming

If you are hoping to do a quick "turn the key on and off five times" dance in the driver's seat to program a new fob for your 2015 Freightliner M2 106, you are unfortunately out of luck.

This vehicle does NOT support DIY on-board programming.

Freightliner integrated the remote keyless entry and immobilizer systems (if equipped) deeply into the truck's central timing module and body controller. To add, delete, or reprogram a key fob or a transponder key, you must interface directly with the vehicle's computer.

Here is what the actual procedure looks like in a professional shop:

1. Connect a heavy-duty scan tool or a laptop running Detroit Diesel Diagnostic Link (DDDL) software to the truck's 9-pin diagnostic port.
2. Navigate to the Body Controller or RKE module section within the diagnostic software.
3. Enter the security programming mode (this may require a dealer-level PIN or active software subscription).
4. Select "Add Remote" or "Program Keyless Entry."
5. Depress the lock and unlock buttons on the new fob simultaneously until the software registers the signal.
6. Cycle the ignition to lock in the programming and test the remotes.

Because this requires specialized software that costs thousands of dollars, this is not a DIY job. You will need to hire a professional.

Battery replacement

If your current remote is just suffering from poor range or intermittent operation, a dead battery is the most likely culprit. Replacing it is quick and easy:

1. Open the fob: Locate the small notch along the side or bottom seam of the remote. Use a small flathead screwdriver or a coin to gently pry the two halves of the plastic casing apart.
2. Remove the old battery: Carefully slide the dead battery out of its metal retaining clip. Note the orientation—the positive (+) side is almost always facing up.
3. Install the new battery: Insert a fresh CR2032 battery into the slot, ensuring the positive (+) side is facing upward.
4. Reassemble: Snap the two halves of the key fob back together tightly. Test the buttons near the truck to ensure it works.

Where to buy a replacement fob

Finding replacements for heavy-duty commercial trucks is different from passenger vehicles. Here are your main options:

• Commercial Dealership: Ordering directly from a Freightliner dealership using your truck's VIN is the safest route. Pros: Guaranteed compatibility, exact OEM parts. Cons: Very expensive, and you will likely have to pay their shop rate (often $150+/hour) for programming. Expect to spend $250 to $400+ total.
• Commercial Locksmith: A mobile locksmith who specializes in heavy-duty and commercial fleets is highly recommended. Pros: They come to your yard, preventing downtime. They have the software to program the remotes and can cut keys on-site. Cons: Finding a locksmith with heavy-duty diagnostic software can sometimes be challenging depending on your area. Expect to pay $150 to $300.
• Online/Amazon: You might find generic remotes online. Pros: Cheap. Cons: High risk of purchasing an incompatible frequency. You will still have to pay a locksmith or dealer to program it, and many will refuse to program customer-supplied electronics due to failure rates.

If on-board programming isn't supported

Since on-board programming is not an option for the 2015 Freightliner M2 106, fleet managers and owner-operators must factor in professional service costs when a key is lost.

If your specific M2 is equipped with an immobilizer system (transponder key), losing all keys means the truck's engine control module will refuse to crank or start. A professional will need to cut a new mechanical key to match the ignition cylinder and then use DDDL or an advanced key programmer to introduce the new transponder chip to the truck's computer.

Always keep at least two fully programmed keys and fobs in rotation for your commercial vehicles to prevent costly downtime.

Find a mobile locksmith or shop on Repairius.