2021 Ram ProMaster — Key Fob Programming

Quick reference

Step-by-step on-board programming

The 2021 Ram ProMaster does not support on-board (DIY) programming for new key fobs. This is because the vehicle is equipped with a sophisticated immobilizer system that requires a diagnostic scan tool and specialized software to pair a new key. Any attempt to program a new key without the proper equipment will fail.

This security measure is in place to prevent unauthorized key duplication and vehicle theft. The scan tool communicates with the vehicle's computer to authenticate the new key fob and its unique transponder chip. Without this digital handshake, the vehicle will not recognize the key, and it will not start the engine.

Therefore, you will need to have your new key fob programmed by a qualified automotive locksmith or an authorized Ram dealership.

Battery replacement

Replacing the battery in your 2021 Ram ProMaster key fob is a simple task you can do yourself.

1. Locate the seam: Look for a small seam along the side of the key fob. This is where the two halves of the plastic casing are joined.
2. Pry open the case: Insert a small flathead screwdriver or a coin into the seam and gently twist to pry the case open. Work your way around the fob until the two halves separate.
3. Remove the old battery: The CR2032 battery will be visible inside. Note the orientation of the positive (+) and negative (-) sides.
4. Insert the new battery: Slide the new CR2032 battery into place, making sure it is oriented correctly.
5. Snap the case shut: Align the two halves of the key fob casing and press them firmly together until they snap back into place.

Where to buy a replacement fob

• Ram Dealership: This is the most expensive option, but you are guaranteed to get a genuine OEM key fob that is compatible with your vehicle. The dealership will also have the necessary equipment to program the fob and cut the key blade. Expect to pay anywhere from $200 to $400 for the fob, cutting, and programming.

• Automotive Locksmith: A qualified locksmith can often provide the same services as a dealership but at a more competitive price. They can source OEM or high-quality aftermarket fobs and have the scan tools to program them. This is often the most convenient option, as many locksmiths offer mobile services. Costs typically range from $150 to $300.

• Online Retailers (Amazon, eBay): You can find a wide variety of aftermarket key fobs online for as little as $50. However, be cautious when buying from these sources. While you might save money on the hardware, you will still need to have the key cut and programmed by a locksmith or dealer. Some online sellers may also offer fobs of questionable quality that may not be programmable or durable.

If on-board programming isn't supported

As mentioned, the 2021 Ram ProMaster requires professional programming. The key fob contains a transponder chip that is part of the vehicle's immobilizer system. This chip must be electronically coded to the vehicle's computer for the engine to start.

The cost for this service can vary, but here’s a general breakdown:

• Key Fob: $50 (aftermarket) - $200+ (OEM)
• Key Blade Cutting: $40 - $80 (for laser cutting)
• Programming: $80 - $200

Always get a quote upfront from the locksmith or dealer. Be sure to have your vehicle's VIN (Vehicle Identification Number) handy, as this is often required to get the correct key and programming information.

Find a mobile locksmith or shop on Repairius.