Chevrolet Key Replacement
Chevy key replacement in the Hudson Valley — why older Chevys keep security in the lock rather than the key, and what changed for 2020 and newer.
Call or text with these and we’ll take it from there
- Year, make and modelIt decides the key and the equipment.
- Any working key?Adding a spare and starting from none are different jobs.
- Where the vehicle isDriveway, lot, roadside — and whether it can be driven.
We come to you
Driveway, lot or roadside
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Same number, either way
Ownership checked
ID and paperwork, every job
Keys, fobs & remotes
Every kind, one call
Chevrolet did something unusual for about a decade: it put the security in the ignition lock instead of in the key. If your Chevy is from that era, your key has no chip in it at all, and a no-start problem is a different kind of problem than it would be on almost any other make.
Older Chevys: the security isn’t in your key
From roughly 1995 through 2004, GM used a system called Passlock across Chevrolet and its sister brands.
Instead of a chip in the key talking to the car, Passlock puts a magnet in the ignition lock cylinder and a sensor next to it. Turn the key and the sensor reads the magnet’s signature. The key itself is an ordinary cut blade — no electronics, nothing to program.
That has a practical consequence people find surprising: on a Passlock Chevy, cutting a replacement key is straightforward mechanical work. There’s no transponder to pair, no tool needed, no security code to obtain. It’s one of the least complicated key jobs there is.
The complication, when there is one, is usually the lock rather than the key.
If your Chevy won’t start after a few attempts
This one is worth knowing before you have the car towed.
Passlock allows three failed reads. After the third, it enters what GM calls Long Tamper Mode and disables the engine for roughly ten minutes. The security light stays on and the car won’t start no matter what you do.
That’s the system working as designed, not a breakdown. If you’ve been fumbling with a worn key or a sticky lock and the car has now stopped responding entirely, leaving it alone for ten minutes is the first thing to try.
Need a key sorted? Call or text — same number.
The relearn you can do yourself
If the system needs resynchronising — after a lock or sensor issue, for instance — Passlock has an onboard procedure requiring no tool.
Passlock I: turn the ignition to ON or RUN and leave it there for about ten minutes, until the security light stops flashing and stays lit.
Passlock II: the same ten-minute cycle, repeated three times.
That’s it. No equipment, no code, no appointment. Whether your vehicle is Passlock I or II depends on the model and year, and if you’re unsure, running the three-cycle version does no harm.
Worth trying before paying anyone.
Newer Chevys: transponder keys
From roughly the mid-2000s GM moved to transponder keys — PassKey III, usually written PK3 or PK3+ — with a chip in the key head and a reader ring around the ignition.
We’re not going to give you model-year cutoffs for that transition. GM staged it by model, and the public documentation doesn’t map it cleanly. Plenty of sites will quote you a specific procedure and a specific year; those trace to parts vendors and forums rather than GM, and we’d rather tell you that than repeat it.
If your Chevy’s key has a plastic head thick enough to hold something and no buttons, it’s likely a transponder key. Tell us the year and model and we’ll tell you what’s involved.
2020 and newer: the security data gate
This is the clean breakpoint, and it changes who can work on your vehicle.
From the 2020 model year, GM gates key programming behind its Secure Data Release Model. Any tool — dealer or independent — has to obtain security data from GM through a credentialed request before it can program a key. That applies to adding a spare and to all-keys-lost equally.
A locksmith who isn’t registered in that system cannot do the work at all. Not slowly, not expensively — not at all.
There’s also a built-in delay. Security data requests carry a mandatory waiting period, and for vehicles serviced after February 2023 that wait is around two hours rather than ten minutes.
So on a 2020-or-newer Chevy, the job includes a wait that nobody can shorten. That’s worth knowing before someone quotes you a fast turnaround. Our key fob replacement guide covers how this credentialing system works generally.
Many newer GM vehicles also use CAN FD, a newer vehicle network, which needs compatible programming hardware. Another reason not every shop can help.
When the fob works but the car doesn’t see it
There’s a documented fault on some recent GM vehicles worth ruling out before you buy a new fob.
GM bulletin 21-NA-244 describes an internal fault in the body control module that causes a “No Fob Detected” message and a no-crank, no-start condition. The distinctive symptom: the fob still works when you press the buttons, but the car won’t detect it passively. Doors lock and unlock from the remote; the car won’t start with the fob in your pocket.
The bulletin names 2021–2022 Corvette, Suburban and Tahoe among affected vehicles.
If that matches your situation, the fob probably isn’t the problem, and a new one won’t fix it. That’s module work at a certified facility rather than a locksmith job — see how car immobilizers work for how to tell the difference generally.
What we do on site. We cut and program Chevrolet keys and fobs on site, including all-keys-lost, on models up to about 2019. Many 2020-and-later trucks and SUVs use GM’s newer electrical system, which needs an online manufacturer session with a built-in wait; some of those go to the dealer. Tell us the year and we’ll say which.
What to have ready
- Model year and model — this determines which of three eras you’re in
- What the key looks like — plain metal blade, thick plastic head, or a fob with buttons
- Whether the security light behaves oddly
- Every key you own
- Proof of ownership — registration or title, and matching photo ID
What it costs
A Passlock-era key is simple mechanical work. A 2020-or-newer vehicle involves credentialed security data and a mandatory wait. Those aren’t close to the same job. What determines car key replacement cost covers what moves it.
Fob just stopped working? It may only be the battery.
Key fob battery guideFrequently asked questions
Does my older Chevy key have a chip in it?
If it’s from roughly 1995 to 2004, probably not. GM’s Passlock system puts the security in the ignition lock rather than the key, so the key is an ordinary cut blade.
My Chevy won’t start and the security light is on.
If you’ve made several attempts, Passlock may have entered Long Tamper Mode, which disables the engine for about ten minutes. Wait it out before assuming a fault.
Can I reset the Passlock system myself?
Often yes. Turn the ignition to ON or RUN and leave it about ten minutes until the security light stops flashing. Some vehicles need that cycle repeated three times.
Why can’t every locksmith program a key for my 2021 Chevy?
From the 2020 model year, GM requires security data obtained through a credentialed request before any tool can program a key. A shop without that registration can’t do the work.
Why does it take so long on a newer Chevy?
The security data request carries a mandatory waiting period — around two hours for vehicles serviced after February 2023. Nobody can shorten it.
My fob works when I press the buttons but the car won’t start.
That specific pattern is described in a GM bulletin as a body control module fault on certain 2021–2022 vehicles. A new fob won’t fix it; it needs module work at a certified facility.
Locked out or lost your key? Call The Fobfather