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Crenshaw Lock

Transponder Key Programming in Altadena · 24/7 mobile

Transponder Key Programming in Altadena, California

Crenshaw Lock Company provides mobile transponder key programming in Altadena, California, 24 hours a day, 7 days a week. We come to your vehicle and program chip keys to its immobilizer, so you don't need a tow. Call (323) 997-8867 to talk with a technician.

  • Mobile to your Altadena location
  • Available 24/7
  • Price quoted before we start
Call (323) 997-8867or tap to call — we answer 24/7
Car key being programmed with a handheld programmer inside a car
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A transponder key looks like an ordinary key, but the plastic head holds a small chip that talks to your car. If the chip's code isn't one the vehicle's immobilizer recognizes, the engine will crank without starting, or won't turn over at all. That is why a copy cut at a hardware counter often opens the door and then does nothing. Programming is the step that teaches the car to accept a particular key.

We are fully mobile. There is no storefront to drive to, and that matters if your only key is lost or your car won't start. A technician brings the equipment to wherever the vehicle is parked, whether that is a driveway in Janes Village, a curb off Lake Ave, or a trailhead lot near the Cobb Estate. Crenshaw Lock Company has served Greater Los Angeles and Ventura County since 1987, and David Shar leads the work.

In Altadena, many households are in unusual circumstances after the Eaton Fire. Some families are living away from home, sharing vehicles, or have lost keys along with everything else. Others are replacing a key that was damaged by heat or ash. We handle these situations plainly and without pressure, and we explain what your vehicle needs before we start.

How it works in Altadena

  1. 1

    Call and describe the vehicle

    Phone (323) 997-8867 and tell us the make, model, and year, and how many working keys you have. Whether you have one key, none, or just a worn spare changes the approach, so we ask this first.

  2. 2

    We come to your car

    Because we are mobile and available around the clock, a technician travels to the vehicle in Altadena. Working on site means the car stays where it is, which helps when it won't start or the keys are gone.

  3. 3

    Confirm ownership

    Before creating or programming a key, we ask you to show that the vehicle is yours. This protects you and is standard, responsible practice for anyone working on vehicle security.

  4. 4

    Cut or prepare the key

    If the key needs a blade, it is cut to match the vehicle's lock. If you already have a key or fob, we check that it is compatible with the vehicle before we try to program it.

  5. 5

    Program to the immobilizer

    Using diagnostic programming equipment, we connect to the car and register the new transponder so the immobilizer recognizes it. Depending on the vehicle, existing keys may also be re-registered at this step.

  6. 6

    Test everything

    We try the key in the door and ignition, start the engine, and confirm that the lock, unlock, and start functions all work before we call the job finished.

Need transponder key programming in Altadena?

24/7 Mobile Locksmith across Greater Los Angeles & Ventura County. We answer 24/7.

Call (323) 997-8867

What affects the price

  • Vehicle make, model, and year, since some immobilizer systems are far more involved to program than others.
  • Whether you still have a working key or all keys are lost, which changes how the programming is done.
  • The type of key: a basic chip key, a flip key, a smart key, or a proximity fob each involve different parts and procedures.
  • Whether a key blade needs to be cut in addition to programming the chip.
  • Where the vehicle is located and the time of day you call, because we serve all hours and travel to you.
  • How many keys you need programmed in the same visit.

Why Altadena chooses us

  • Fully mobile service: we work at your vehicle rather than asking you to tow it to a shop.
  • Open 24/7, including nights, weekends, and holidays, so a lost key doesn't have to wait until morning.
  • In business since 1987, with owner David Shar leading the work.
  • Straightforward explanations: we tell you what your vehicle's system requires and what the options are before we begin.
  • Ownership is verified before we program a key, which keeps your vehicle protected.
  • Familiarity with Altadena's circumstances, including households dealing with displacement and rebuilding after the Eaton Fire.

Transponder Key Programming across Altadena

Altadena stretches along the foothills below the San Gabriel Mountains, and daily life here means a lot of driving: Lake Ave, Lincoln Ave, Fair Oaks Ave, Altadena Dr, and Woodbury Rd are the routes people rely on. Cars are parked in older Janes Village driveways, on the hills near Christmas Tree Lane along Santa Rosa Avenue, and around the Altadena Country Club and The Meadows. When a key stops working or goes missing, the vehicle is often right where you left it, and we come to it.

This community has been through a hard stretch since the January 2025 Eaton Fire. Families in ZIP codes 91001 and 91003 may be sharing one car, replacing keys lost in the fire, or managing a vehicle with a key that was exposed to heat or soot. A damaged chip key can fail without warning, and having a freshly programmed spare is a practical safeguard while you rebuild.

We also see drivers who park at Charles White Park, Farnsworth Park, or the Sam Merrill Trailhead near the Cobb Estate and come back to find a key missing. Whether you are at home or out on the trail, call (323) 997-8867 and we will tell you what we can do for your vehicle.

Locked out or need a locksmith now?

24/7 Mobile Locksmith across Greater Los Angeles & Ventura County. We answer 24/7.

Call (323) 997-8867

Other Altadena locksmith services

See all of our Altadena services, or our citywide transponder key programming page.

Transponder Key Programming in Altadena — FAQs

What is a transponder key?
It is a key with a small chip inside the head. The car's immobilizer reads the chip's code, and the engine will only start if the code matches one it has been taught to accept.
Can you program a key if I lost all of mine?
In many cases, yes. All-keys-lost situations are handled differently from adding a spare, so call (323) 997-8867 with your vehicle details and we will explain what is involved.
Do I need to tow my car to you?
No. We are fully mobile and come to your vehicle in Altadena, so towing is typically not necessary for key programming.
Are you available at night or on weekends?
Yes. We are available 24/7, including nights, weekends, and holidays. Call (323) 997-8867 at any hour.
Why won't my copied key start the car?
A key that was only cut, without its chip being programmed, can turn in the lock but the immobilizer will not recognize it. Programming the chip solves this.
Do I have to prove I own the vehicle?
Yes. We verify ownership before creating or programming a key. It is a standard safeguard that protects you from someone else obtaining a key to your car.
My key was near the Eaton Fire damage. Can it still be used?
Heat and soot can damage a key's chip or case. If it is unreliable, we can check it and program a replacement, which is wise before it fails completely.
How is the price determined?
Cost depends on the vehicle, key type, whether any working key remains, how many keys you need, and the location and time. Call (323) 997-8867 and we will talk through the factors for your situation.
DS

Reviewed by David Shar — Owner & Lead Technician

Crenshaw Lock Company has served Greater Los Angeles & Ventura County since 1987.

Last updated 2026-10-12.

Call (323) 997-8867 · Open 24/7