2020 Ford F-250 Super Duty Key Fob Programming Guide

As an ASE-certified electrical technician and automotive locksmith, I see a lot of heavy-duty trucks roll through the shop with missing, damaged, or dead keys. The 2020 Ford F-250 Super Duty is a rugged workhorse, but its anti-theft and keyless entry systems are highly advanced. Whether you have the flip-key or the push-to-start smart key, understanding how your truck’s immobilizer works can save you a lot of time and money.

Here is your comprehensive guide to the 2020 Ford F-250 Super Duty key fob.

Quick reference

Step-by-step on-board programming

Ford has a built-in safety feature for most of its modern vehicles: you can program a third (or fourth) key yourself, but only if you already possess two original, programmed, and working keys. This prevents a valet or mechanic from easily cloning a key with just one original.

If you have two working push-to-start smart keys, follow these steps to program a third:

1. Locate the backup slot: Open your center console. Remove the cup holders or look at the bottom of the console bin to find the designated key fob backup slot (a small indentation shaped like your fob).
2. Insert the first working key: Place your first programmed key fob into the backup slot.
3. Cycle the ignition: Press the START/STOP button without pressing the brake pedal (accessory mode). Wait about 3-5 seconds, then press it again to turn the ignition off.
4. Insert the second working key: Remove the first key and immediately place the second programmed key into the slot.
5. Cycle the ignition: Press the START/STOP button (without the brake), wait 3-5 seconds, and turn it off.
6. Insert the new, unprogrammed key: Remove the second key and place the new, unprogrammed key fob into the slot.
7. Program the new key: Press the START/STOP button (without the brake). You should see a message on the dashboard stating "Key Programmed" or the door locks will cycle to confirm success.
8. Test the key: Remove the new fob and test the lock, unlock, and remote start (if equipped) functions. Step on the brake and attempt to start the engine.

Note for Flip Keys: The procedure is similar, but instead of using a backup slot, you will physically insert the keys into the ignition cylinder and cycle them from OFF to RUN.

Battery replacement

If your dash displays a "Key Battery Low" warning, it’s time for a change. The smart key uses a CR2450 battery, while the flip key typically uses a CR2032.

1. Remove the emergency blade: Slide the release latch on the back or bottom of the fob to pull out the metal emergency key.
2. Pry the shell open: Use the tip of the emergency key or a flathead screwdriver to gently pry the two halves of the fob apart. Use the designated notch to avoid damaging the plastic.
3. Remove the old battery: Note the orientation (usually positive side facing up) and carefully pop the old battery out.
4. Insert the new battery: Place the new CR2450 or CR2032 into the slot, matching the original orientation.
5. Reassemble: Snap the two halves of the shell back together and reinsert the emergency key.

Where to buy a replacement fob

When sourcing a replacement key, you have three main avenues:

• The Dealership:
  • Pros: Guaranteed OEM quality, correctly matched to your VIN, programmed correctly.
  • Cons: Most expensive route. Expect to pay $250-$350 for the part, plus $100-$150 for cutting and programming.
• Automotive Locksmith:
  • Pros: Mobile service (they come to you), usually carry both OEM and reliable aftermarket options, typically 20-40% cheaper than the dealer.
  • Cons: Quality of aftermarket keys can vary depending on what the locksmith stocks.
• Amazon / Online Retailers:
  • Pros: Very cheap upfront cost ($20-$60 for the fob).
  • Cons: Extremely high failure rate for cheap knockoffs. You still have to pay a professional to cut the blade and program the transponder, and many locksmiths will not guarantee customer-supplied parts.

If on-board programming isn't supported

If you have lost all your keys, or you only have one working key, you cannot use the DIY on-board programming method. The 2020 F-250 uses a highly secure Texas Crypto 128-bit immobilizer system.

To add a key when you have fewer than two, a technician must connect a professional bi-directional scan tool (like the Ford IDS/FDRS or an advanced aftermarket programmer like an Autel IM608) to the truck's OBD-II port. The technician must ping the server, bypass the security gateway, and program the new transponder directly to the truck's ECU.

Expect this service to cost between $150 and $300 for the labor and programming, depending on your location and whether you require emergency mobile service.

Find a mobile locksmith or shop on Repairius.