Mercedes-Benz GLA key replacement

Mercedes-Benz GLA keys by year

What happens when a GLA key goes missing or stops working?

The Mercedes-Benz GLA is a compact crossover, and its key is not a simple blade with a chip in the head. Every model year in our data uses a smart-proximity fob with a mechanical backup key hidden inside, and the car's ignition system talks to the fob through Mercedes' encrypted FBS system. That one fact shapes everything on this page: what we can do, what only the dealer can do, how long it takes, and what drives the cost.

Two things catch owners off guard. First, a replacement fob is not cut and cloned like an old house-style key. It is ordered against your VIN and then coded to the car's electronic ignition. Second, the GLA spans two quite different generations, and the answer for a 2017 owner is not automatically the answer for a 2023 owner. Below we go through each era plainly, including the places where our information is incomplete.

If you want the wider picture, see our Mercedes-Benz key replacement overview and the car keys hub. If you are stuck right now, call (213) 577-1366. The line is answered 24 hours a day, every day of the year.

What do 2016–2020 GLA owners need?

The first-generation GLA, internal code X156, ran from the 2015 model year through 2020. For 2016 through 2020 our data is verified: these cars use the FBS4 (DAS4) system, which Mercedes' own bulletin places from November 2014 production for the model 156. The fobs are smart-proximity, and the standard setup keeps the insert-and-twist SmartKey ignition. Push-button KEYLESS-GO start was an optional extra, so look at your dash to see whether yours has a slot or a button.

In practice, added or replacement keys on these years are effectively dealer-only. The key is ordered against your VIN and coded at the dealer, and you should expect a multi-day wait for that order. We would rather say that up front than tell you something comfortable and then leave you waiting.

Where we are useful on these cars is everything around that order. We can work out whether the key is really the problem or whether the fault sits in the ignition or antenna side. We can replace a dead fob battery, help with a lockout, and explain the sequence so you are not paying twice for the same diagnosis. If a particular job turns out to be something we can handle ourselves, we will say so. If it needs the dealer, we will say that too.

Why is the 2015 GLA a special case?

The 2015 model year is a genuine boundary, and this is the one year where our data is marked conflicting. US GLA sales began in September 2014. Mercedes' bulletin puts the switch to FBS4 for model 156 at November 2014 production. That means the earliest 2015-model cars can still be FBS3, and later ones FBS4. Silca's catalogs list the 2013–2014 X156 keys as FBS3, which fits that picture.

This matters because the two systems are treated very differently. FBS3 cars are specialist-serviceable. FBS4 cars are effectively dealer-only. Two 2015 GLAs parked next to each other can land on opposite sides of that line.

So we never quote a 2015 GLA from the model year alone. We identify the system from the VIN and Vedoc data before we tell you what is possible. We also have no verified chip family for 2015 in our records, and we are not going to guess one. Give us the VIN when you call (213) 577-1366 and we will confirm the exact setup before anyone drives out or places an order.

What about 2021–2026 GLA owners?

The current generation, code H247, runs from 2021 through 2026 and sits on the MFA2 platform shared with the W177 A-Class. These cars are push-button start with a smart-proximity fob and a mechanical backup key, and our records list them as FBS4 (DAS4) era.

Here we have to be careful. For 2021 onward, our records mark the chip data as unverified. The A-Class sibling's ignition module is documented as FBS4 by Abrites, but we did not verify GLA-specific key documentation for H247. We assume added and replacement keys are dealer-only, and we confirm the current procedure for each job by VIN rather than assuming it.

If you own a newer GLA, the practical advice is the same as for the older cars, with one extra caution: do not let anyone promise you a quick on-site key until the VIN has been checked. A confident promise on an unverified system is a warning sign. Ask us what we know and what we are still confirming, and we will answer that straight.

Spare key or all keys lost: what changes?

Our data shows that on every GLA year, a duplicate does not require an original key, and an all-keys-lost situation is possible to resolve. That is good news, but it does not mean it is simple or fast.

With a spare key still in your hand, the job is mostly ordering a new fob and having it coded. Since the car already recognizes a working key, there is less to untangle. The usual dealer-order wait still applies on FBS4 cars, so do not wait until your last fob is damaged. A cracked shell, a worn button or a flaky battery is the cheap moment to act.

With all keys lost, the process is heavier. The car has to be identified, ownership has to be established, the replacement is ordered by VIN, and the new fob has to be coded to the ignition module with no working key to start from. On a dealer-only FBS4 car that usually also means getting the vehicle to the dealer, which is where towing or flatbed transport can come into play. We will tell you whether that is likely before you commit to anything.

Bring proof of ownership either way, such as registration and your ID. Any honest shop will ask for it, and it protects you.

Is GLA key programming an OBD job or dealer-only?

For most GLAs, it is dealer-only, and we say so without hedging. On the verified 2016–2020 cars, programming is recorded as dealer-only. On 2021–2026 it is assumed dealer-only, pending confirmation by VIN. The one exception worth checking is an early 2015 car on FBS3, where specialist service is realistic.

Some people expect a locksmith to plug into the OBD port, run a tool and have a new key in a short visit, as can happen on older vehicles. FBS4 does not work that way for most shops. The system is designed so that new keys are coded through manufacturer-controlled processes. That is why the VIN-coded dealer order exists in the first place.

What we offer is honest triage. We read the VIN, find out which system your car has, and tell you whether the job is something we can do or whether it belongs at the dealer. If it belongs at the dealer, we will say so and explain what to ask for, so you do not lose time or pay for something that will not work.

Our data also does not show a requirement for special registration credentials on these cars, and we will not invent one. Where a step is unconfirmed, we say it is unconfirmed.

What affects the cost of a GLA key replacement?

We do not quote numbers on a web page, because the honest answer depends on your car. Here is what actually moves the cost.

The biggest factor is which path the job takes. A dead-battery fix is a very different job from an ordered and coded replacement fob, and an all-keys-lost case is a bigger job again. The FBS system on your VIN decides whether a specialist route exists or whether everything runs through the dealer.

The other factors are practical ones. They include how many keys you need, whether you still have a working key, whether the fob itself is damaged, and whether the real fault is a worn ignition or antenna problem rather than a key. They also include where the car is and whether it can be driven, and whether a mobile visit or a transport to the dealer makes more sense.

Usually the more economical route is the one that starts earliest. Replacing a fob battery or a cracked shell while the key still works is lighter-cost than an all-keys-lost job later. Ask for the whole picture before you agree, and compare it against the dealer's quote. We would rather you decide with the full picture.

Which key problems are common on the GLA?

The problems in our data are consistent across both generations, and many of them are not a lost key at all.

The first group is fob wear and battery trouble:

The second group is faults that look like a bad key but are not:

• Dead fob battery. The remote buttons fail first, and the car may report 'key not detected'. Try this before assuming the fob is dead.
• Water-damaged fobs, such as one that went through the wash or sat in a wet pocket.
• Cracked Chrome-key shells and worn buttons on the earlier cars.
• Aging SmartKey electronics that stop syncing with the car.
• Failed or worn EIS/EZS electronic ignition on 2015-era cars, where the key is not recognized or will not turn.
• Keyless antenna or start-button faults that mimic a bad key on the newer cars.
• Lost or damaged fobs that need a VIN-coded dealer order, with a multi-day wait.

When should you call us, and when should you go to the dealer?

Call us first if you are not sure what is wrong. A fob that has stopped working might need only a battery, a shell or a diagnosis, and we can tell you quickly. We are one company, with a storefront at 10740 Wilshire Blvd in Westwood and mobile service vans, so there is no dispatch middleman between your call and the person who knows your car. We have been in business since 1987, and David, the owner and lead technician, oversees the work.

Go to the dealer when the job truly needs a VIN-coded FBS4 key and no other route exists. We will tell you if that is the case. Often the best order of events is that we diagnose, confirm the system by VIN, and you place the dealer order with the right information.

Here is how we handle a call:

California requires locksmith companies to hold a BSIS LCO license, and you should ask any locksmith for it before they work on your car. For wider questions, head to the Wilshire Lock & Key home page, or reach us through the contact page.

1. Call (213) 577-1366 and tell us the year, the symptoms and the VIN if you can.
2. We confirm the key system from the VIN, especially for 2015 and for 2021 onward where data is conflicting or unverified.
3. We separate a fob issue from an ignition or antenna issue.
4. We tell you plainly what we can do, what needs the dealer, and what affects the cost.
5. You decide, with the whole picture in front of you.

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