2020 Subaru Crosstrek Key Fob Programming Guide

As an ASE-certified electrical technician and automotive locksmith, I frequently get questions about modern Subaru keys. The 2020 Subaru Crosstrek is a fantastic, versatile vehicle, but when it comes to replacing or programming a new key fob, things are much more secure—and complex—than older models.

Whether your Crosstrek uses a traditional turn-key or the push-to-start smart key system, the security systems are heavily integrated. Here is your comprehensive guide to the 2020 Subaru Crosstrek key fob.

Quick reference

Step-by-step on-board programming

If you are hoping to do a "door dance" (opening and closing doors while turning the ignition) to program a 2020 Subaru Crosstrek key, I have some bad news. There is no DIY on-board programming procedure for the 2020 Subaru Crosstrek.

Subaru updated their immobilizer and keyless entry systems in recent years to prevent relay attacks and vehicle theft. The vehicle's computer requires a secure "handshake" using specialized diagnostic equipment to authorize a new key.

Here is what the actual procedure looks like when performed by a professional:

1. Connect the Scan Tool: A locksmith connects an advanced scan tool (like an Autel MaxiIM or Smart Pro) to the Crosstrek’s OBD2 port under the driver's side dash.
2. Read the Immobilizer Data: The technician pulls the immobilizer data from the vehicle's BCM (Body Control Module). For modern Subarus, this often requires an active internet connection to calculate bypass codes.
3. Register the Key: The system prompts the technician to hold the new fob near the push-to-start button (or insert the turn-key into the ignition) to register the transponder chip.
4. Verify Functions: Once registered, the technician verifies that the proximity functions, remote buttons, and push-to-start system are fully operational.

Battery replacement

Even if you can't program the key yourself, you can easily change a dead battery. The 2020 Subaru Crosstrek fob takes a standard CR2032 coin-cell battery.

1. Press the small silver button on the back of the smart key to release the emergency metal key blade.
2. Pull the emergency key blade completely out of the fob.
3. Look into the slot where the key blade was housed. You will see a small notch splitting the two halves of the plastic fob shell.
4. Insert a flathead screwdriver (or the tip of the emergency key itself) into the notch and gently twist to pry the fob apart.
5. Carefully remove the electronic circuit board to access the battery on the back.
6. Pop out the old CR2032 battery and insert the new one, ensuring the positive (+) side is facing up.
7. Snap the plastic shell back together and reinsert the emergency key blade.

Where to buy a replacement fob

When sourcing a replacement key for your Crosstrek, you have a few options, each with its own pros and cons:

• The Dealership:
  • Pros: Guaranteed OEM parts. Reliable service.
  • Cons: Very expensive. You usually have to tow the car to the lot if you have lost all your keys.
  • Ballpark Price: $300 – $450 (Parts and labor).
• A Mobile Locksmith:
  • Pros: They come to you, saving you a tow. Often cheaper than the dealer. They can cut the emergency blade on-site.
  • Cons: You must ensure they have the latest software for 2020+ Subarus.
  • Ballpark Price: $200 – $350.
• Amazon / Online Retailers:
  • Pros: The fob itself is very cheap (often $30 - $70).
  • Cons: You still have to pay a locksmith to cut and program it. Many locksmiths will not guarantee aftermarket keys bought online, and if the chip is locked or defective, you'll still owe a programming fee.

If on-board programming isn't supported

Because on-board programming isn't supported for the 2020 Crosstrek, you must factor programming costs into your replacement budget. The vehicle uses an advanced encrypted transponder chip (often an 8A or newer AES chip depending on the trim) integrated into the vehicle's Immobilizer system.

If you lose all your keys, the situation becomes an "All Keys Lost" scenario. This takes more time, as the technician must reset the immobilizer system completely before adding new keys, which will drive up the labor cost. Always try to keep at least two working keys for your vehicle to avoid these premium charges!

Find a mobile locksmith or shop on Repairius.