2020 Chevrolet Tahoe — Key Fob Programming

Quick reference

Item	Detail
FCC ID	Varies by trim/equipment. Verify on your current fob’s label or with VIN at the dealer/locksmith. Do not assume.
OEM Fob PN	Varies by VIN (push-button vs turn-key). Have a dealer/locksmith look up the correct GM part by VIN to ensure a match.
Aftermarket Options	Yes. OEM-new, OEM-refurbished, and aftermarket shells/fobs exist. Must match the exact FCC ID and GM part number to function.
Battery Type	Most 2020 Tahoe fobs use CR2032 (verify inside your fob).
Programmable On-Board?	Push-button start: Yes, if you have at least one working fob. All keys lost: No. Turn-key ignition (remote-head key): No (scan tool required).
Cuts Required?	Push-button start: emergency key blade must be cut. Turn-key ignition: main blade must be cut and transponder programmed.

Step-by-step on-board programming

Important: The 2020 Tahoe came in two systems. Identify yours first:

• Push-button start (PEPS/proximity smart key)
• Turn-key ignition (remote-head key)

Only some push-button models support DIY adding of an extra fob when you already have a working one. If you have a turn-key ignition or no working fobs, you’ll need a dealer/locksmith scan tool.

If you have push-button start AND at least one working fob:

1. Gather everything: Bring all fobs you want to use (new and currently working). The vehicle can learn multiple fobs, but they must be programmed in the same session.
2. Locate the transmitter pocket: It’s marked with a small key icon—usually inside the front center console or adjacent to the cup holder area. Check your owner’s manual for the exact spot.
3. Enter accessory mode: Sit in the driver’s seat with doors closed. Without pressing the brake, press the START/STOP button to power up the cluster (do not start the engine).
4. Place the working fob in the transmitter pocket: Wait a few seconds. If your instrument cluster or infotainment shows a menu, navigate to Settings > Vehicle (or similar) and look for Remote Key/Key and Remote > Add/Replace. Some trims automatically enter learn mode once a valid fob is detected in the pocket.
5. Add the new fob: Remove the working fob. Place the new/unprogrammed fob in the same transmitter pocket. Press the START/STOP button (do not press the brake). Wait for a confirmation chime or message that the remote is learned.
6. Program additional fobs: Repeat Step 5 for each additional fob you’re adding in this session.
7. Exit learn mode: Remove the fob from the pocket and start the vehicle normally (press brake and START) or power the vehicle off. Test all buttons (Lock/Unlock/Remote Start/Trunk) and verify passive entry/start.

Notes:

• If your menus do not show an “Add/Replace” option or you cannot get the vehicle into learn mode, that configuration requires a scan tool to initiate remote learn. This is common on later software revisions and certain trims.
• If all keys are lost (no recognized fob), 2020 GM trucks/SUVs generally require security access via a dealer/locksmith tool. DIY 30‑minute relearn routines are typically disabled.

Turn-key ignition (remote-head key):

• On-board programming of the remote and immobilizer is not supported on 2020 Tahoe keyed models. A dealer/locksmith must use a compatible GM scan tool to pair the remote functions and the transponder to the BCM/immobilizer.

Battery replacement

Most 2020 Tahoe fobs use a CR2032 coin cell. To replace:

1. Open the key: For proximity fobs, slide the release and remove the emergency blade. For remote-head keys, flip out the blade.
2. Separate the case: Insert a plastic pry tool or a coin into the seam and gently twist to split the halves. Work around the edge—avoid metal tools if possible.
3. Swap the battery: Note the polarity. Remove the old CR2032 and install the new one with the + side oriented the same way as the original (typically up).
4. Reassemble and test: Snap the case together, reinstall the blade, and test Lock/Unlock and, if equipped, Remote Start.

Tip: Weak batteries can still lock/unlock but fail to support passive entry/start. If range is short or the vehicle displays “No Remote Detected,” change the battery first.

Where to buy a replacement fob

• Dealer (GM): Best for guaranteed correct part by VIN and for latest software revisions. Expect about $160–$320 for the fob plus $75–$150 for programming and, if needed, $20–$50 to cut the blade. Push-button emergency blades are extra.
• Automotive locksmith: Often 20–30% less than dealer. Many stock OEM or high-quality aftermarket fobs and can cut/program on site. Typical out-the-door ranges: $140–$350 depending on proximity vs remote-head and your region.
• Online (Amazon/eBay/parts retailers): Lowest upfront price ($35–$120 for aftermarket; $80–$200 for OEM/refurbished). You must match FCC ID and GM part number exactly and still pay a locksmith for cutting/programming if on-board is not supported.

If on-board programming isn’t supported

• Security/immobilizer: The 2020 Tahoe uses a GM encrypted immobilizer. Remote-head keys contain a transponder chip; proximity fobs communicate with PEPS antennas and include an emergency blade. Exact transponder family can vary by build; your locksmith can confirm by VIN/scan.
• All keys lost: Expect professional programming with security access. Typical totals:
  • Dealer: $250–$500+ depending on fob type, cutting, and labor.
  • Locksmith: $200–$420+, often same-day mobile service.
• Adding a spare: If your push-button Tahoe supports on-board adding, you may only pay for the fob and cutting of the emergency blade. If not, budget $80–$150 for programming labor on top of the fob cost.

What your pro will do: Verify the correct FCC ID/GM PN, cut the blade, connect a GM-compatible tool (e.g., MDI/J2534-capable), obtain security authorization, and program the fob/keys to the BCM and immobilizer. They’ll also clear any old/unknown fobs if requested.

Find a mobile locksmith or shop on Repairius.