Question 1

What is the cheapest way to handle all-keys-lost on my 2020 Tahoe?

Accepted Answer

Skip the tow and call a mobile locksmith who works GM smart key systems. All-keys-lost on this generation of Tahoe requires professional diagnostic equipment to wipe the immobilizer memory and enroll new fobs. The dealer route means a tow if the vehicle won't start, a service appointment, and a wait. Some owners on full-size GM forums reported being quoted per-fob prices that added up fast when they needed two keys registered.

One thing worth knowing about this system: when you do an all-keys-lost reset, the process wipes every previously enrolled fob. So if you want two working keys when it's done, get both programmed in the same session. Coming back for a second key later means another programming visit. Doing it all at once on site, in your driveway or parking lot, is the move.

Question 2

Can you delete a lost or stolen fob so it no longer starts my Tahoe?

Accepted Answer

Yes. The all-keys-lost procedure wipes the immobilizer's enrolled key memory entirely. Only the fobs physically present and programmed during that session will start the vehicle afterward. The stolen or lost fob becomes useless for starting the car.

One extra step people overlook: if the lost fob had the emergency blade inside, that blade is cut to your door locks. Wiping the fob from the immobilizer stops the engine start, but it does not change the physical lock. If you want full peace of mind, rekeying the door cylinders covers that angle too.

Question 3

Does my 2020 Tahoe smart key have a hidden emergency blade?

Accepted Answer

It does. There is a small release button on the fob housing. Press it and the mechanical blade slides out. That blade fits a physical key slot on the vehicle, which a lot of Tahoe owners have never actually located because they've never needed it.

When you get a replacement fob, that blade has to be cut to match your specific door locks. The fob programming handles the ignition and remote functions, but the blade is a separate step. If a locksmith or dealer hands you a programmed fob and the blade is uncut, that half of the job isn't finished.

Question 4

My 2020 Tahoe shows a key warning on the dash but the fob battery is fine. What else could cause that?

Accepted Answer

A few things. The most common one after battery is interference. The system uses a low-frequency signal to detect the fob inside the cabin, and some aftermarket accessories, dash cams wired to certain circuits, or even other electronics sitting near the center console can create enough noise to interfere with fob detection. Tahoe owners on GM forums have traced intermittent key-not-detected warnings to exactly that.

The other possibility is the fob itself. If the fob took a hard drop or got wet, the internal antenna or circuit board can be damaged without any visible sign on the outside. The fob might respond sometimes and not others.

If the fob detects fine outside the car but the warning shows inside, that points toward the vehicle's receiving antennas or the body control module rather than the fob. That is a diagnostic job, not a fob replacement job, and those two things cost very different amounts to fix.

Question 5

Can relay-attack theft actually happen to a 2020 Tahoe, or is that just internet fear?

Accepted Answer

It is real and documented on full-size GM SUVs. The attack uses two people with amplifier hardware. One stands near wherever you store your key inside the house, the other is near the vehicle. The amplifier extends the fob's signal far enough that the car thinks the fob is right outside the door handle. It unlocks and starts without any key in hand, no window smash, no broken steering column.

The fix is cheap: a Faraday pouch or a small metal container where you drop the fob at night. That blocks the signal so there's nothing to amplify. Some owners in higher-theft areas also turn off passive entry in the vehicle settings so the door handles don't respond to proximity alone. Neither fix costs much and both actually work.

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