Question 1

What is the cheapest way to replace a key for a 2020 Chevrolet Trax?

Accepted Answer

Call a mobile locksmith first. Dealers on GM owner forums consistently report single-key replacement quotes that make you wince, plus a tow if you have no working key, plus a wait while the key is ordered by VIN. With EZ Car Keyz you get the fob, the cut emergency blade, and the programming done on site in Montecito, no tow, no wait, for a fraction of what they wanted at the dealer. Call for the number.

Question 2

How much more does all-keys-lost cost compared to just adding a spare?

Accepted Answer

More, always, on any modern GM. Here is why.

When you still have one working key, adding a second is relatively fast. The car trusts the enrolled key, the tool authenticates through it, and the new fob gets added to the list.

When every key is gone, that shortcut is off the table. The job becomes a full security relearn through the diagnostic port, a timed access cycle that cannot be rushed, and on the 2020 Trax the system requires a minimum of two keys to be registered before it will close out the procedure. That means two fobs cut and programmed whether you want them or not.

The practical takeaway: get a spare made while you still have one working key. It is the single best thing you can do to keep the cost manageable if something goes wrong later.

Question 3

Do aftermarket fobs work on the 2020 Trax, and are they actually cheaper?

Accepted Answer

They can work, and the sticker price is lower. But the gap between "cheaper fob" and "cheaper job" is smaller than it looks.

The fob itself is only part of the cost. Programming still requires a professional tool regardless of where the fob came from. And aftermarket fobs sourced from general retail channels have a real failure rate at the programming stage, which means a second trip, a second fob, and a job that costs more than if you'd used a quality part from the start.

I source from professional-grade suppliers, not Amazon listings. The fob going in is built to the same spec as the factory part. If something does not pair correctly, that is on me to sort out, not on you to chase down a refund.

Question 4

My 2020 Trax shows a key warning on the dash even though my fob battery is new. What is going on?

Accepted Answer

A few things can cause this even with a fresh CR2032 in the fob.

First, check how the battery was seated. If the fob was pried open roughly, the contact plate inside can get a slight bend that keeps the battery from sitting fully flat. A new battery in a bent housing still reads as low or absent to the car.

Second, the fob's internal board can lose sync with the vehicle after a dead-battery event or after the car sits a long time. The key-not-detected warning does not always mean the fob is broken. Sometimes it means the car and the fob need to be reintroduced through the diagnostic port.

Third, if the warning is intermittent and tied to a specific door handle, that is usually a handle antenna or wiring issue on that door, not the fob at all. Worth isolating which door triggers it before assuming the key itself is the problem.

Question 5

The stolen or lost key physically fits my Trax. Can the previous owner or a thief still use it?

Accepted Answer

Not to start the car, once the key memory has been wiped.

The physical blade cuts are the same across keys for a given vehicle, so yes, a lost fob can still insert into the door lock cylinder or the steering column. But on the 2020 Trax the immobilizer is what actually gates the engine. If that fob's code is no longer enrolled in the system, the car reads it as an unknown key and will not allow the engine to run.

The door locks are a separate matter. If you want the physical lock cylinder to reject the old blade entirely, that requires rekeying, which is a different job. A lot of owners in theft situations ask for both: wipe the key memory and rekey the locks. That covers both angles.

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