2020 Ram ProMaster — Key Fob Programming Guide

Quick reference

Item	Detail
FCC ID	Check the label on your existing fob; varies by build/options. Always match the FCC ID printed on your original.
OEM Fob PN	Verify by VIN with a Mopar/Ram parts desk; part number varies by trim and equipment. Do not assume.
Aftermarket Options	Remote-head keys and full replacement fobs are available; choose units that explicitly list 2020 Ram ProMaster and your exact FCC ID.
Battery Type	CR2032 coin cell
Programmable On-Board?	No — 2020 ProMaster requires professional scan-tool programming with FCA Security Gateway access.
Cuts Required?	Yes — high‑security sidewinder (laser‑cut) blade must be cut to your van.

Step-by-step on-board programming

There is no user DIY/on-board programming procedure for a 2020 Ram ProMaster. Starting in this generation, Ram/Fiat Chrysler vehicles use a Security Gateway (SGW) and immobilizer that require a dealer- or locksmith-grade scan tool with registered FCA access and a valid PIN to add or erase keys/remotes.

What to do instead:

1. Gather your information

• VIN and proof of ownership (registration/ID).
• All existing working keys/remotes (they must be present to remain active).

2. Buy the correct fob/key blank

• Match the FCC ID on your original and confirm 2020 ProMaster fitment with the seller.
• If you don’t have an original, contact a Ram dealer with your VIN to identify the correct OEM part number, then source OEM or a quality aftermarket equivalent.

3. Have the blade cut

• The ProMaster uses a high‑security sidewinder blade. Most hardware stores can’t cut these; a locksmith or dealer will.
• Provide your key code if you have it; otherwise the tech can decode from an existing key or via VIN.

4. Professional programming session

• A locksmith or dealer connects a compatible scan tool through the OBD‑II port, authenticates through FCA’s SGW, and retrieves/uses the vehicle’s PIN.
• They add the new key/fob to the immobilizer and program the remote lock/unlock functions in the same session.

5. Verify operation

• Test engine start, remote lock/unlock, and panic.
• Confirm that previously-present keys still work (if not present during programming, they may be erased on some procedures).

Tip: Some FCA platforms historically supported “self-add” with two working keys. The 2020 ProMaster does not offer this; an approved scan tool is required.

Battery replacement

The 2020 ProMaster remote-head key/fob uses a CR2032 coin cell.

1. Open the fob case

• Insert a small flat screwdriver or coin into the case seam/notch and gently twist to separate the halves. If your variant has a tiny screw on the back, remove it first.

2. Replace the battery

• Note polarity before removal; most variants install the CR2032 with the + side facing up.
• Avoid touching the new cell’s faces with bare fingers; use a tissue or gloves to keep oils off.

3. Reassemble

• Snap the halves evenly all around (reinstall the screw if equipped).
• Test buttons. If range is weak, reseat the battery and ensure the rubber pad is aligned.

Battery change does not affect immobilizer programming. If the fob stops starting the van after a battery swap, the issue is not the coin cell—have the key/fob tested.

Where to buy a replacement fob

• Dealer (Mopar OEM)

  • Pros: Guaranteed correct part by VIN; latest superseded part number.
  • Cons: Highest price.
  • Expect: $220–$380 for the fob/key plus $100–$180 for cut/programming.

• Automotive locksmith

  • Pros: Mobile service; can cut laser keys and program on-site; competitive pricing; can supply OEM or quality aftermarket.
  • Cons: Quality varies—choose a reputable, licensed pro.
  • Expect: $150–$300 complete for aftermarket; $200–$350 for OEM-equivalent.

• Online (Amazon/eBay/parts sites)

  • Pros: Lowest part prices; convenient.
  • Cons: You still need cutting and programming; risk of wrong FCC ID or incompatible electronics; returns can be a hassle.
  • Expect: $25–$90 for an aftermarket remote-head key or fob; add $30–$60 cutting and $80–$150 programming by a pro.

Always match your FCC ID and year/make/model listing before buying. If in doubt, call a locksmith with your VIN for guidance.

If on-board programming isn't supported

• Why: The 2020 ProMaster uses an immobilizer with a transponder (commonly ID46‑type) and an FCA Security Gateway that blocks key addition without authorized diagnostic access. A DIY ignition‑cycling sequence does not exist.

• What it takes: A dealer or licensed locksmith will verify ownership, cut the high‑security blade, obtain the vehicle PIN, and use an approved scan tool to add the key. Plan for one visit (~30–60 minutes if everything is on hand).

• Cost expectations: Typically $180–$400 all-in depending on OEM vs aftermarket parts, your region, and whether mobile service is used. Additional keys in the same session are usually cheaper.

• Lost-all-keys: Expect the high end of the range. A pro may need to remove a lock to decode or request key code by VIN, then program new keys from scratch.

Need help now? Find a mobile locksmith or shop on Repairius.