Mercedes-Benz GLA vs Mercedes-Benz GLB: key replacement compared
Shopping the Mercedes-Benz GLA against the Mercedes-Benz GLB? They are a common compact luxury SUVs cross-shop in the Statesboro area, and the key replacement story is different enough to matter. If you are weighing which is simpler or quicker to get a replacement key for, here is the head-to-head: key technology by model year, how a lost-key job actually runs on each, and the field quirks we see most. Call (912) 209-6131 for same-day mobile service on either one.
Mercedes-Benz GLA vs Mercedes-Benz GLB at a glance
| Mercedes-Benz GLA | Mercedes-Benz GLB | |
|---|---|---|
| Model years covered | 2015–2025 | 2020–2025 |
| Earliest key type | Proximity / Keyless-Go | Proximity / Keyless-Go |
| Newest key type | Proximity / Keyless-Go | Proximity / Keyless-Go |
| Lost-all-keys handling | Typically on-site via OBD-II | Often on-site; some years need dealer / PIN coordination |
| Spare from a working key | On-site, same visit | On-site, same visit |
Key types by year, side by side
Both vehicles changed key technology over their runs, so the right blank, chip, and programmer depend entirely on your model year. Here is what each one uses:
Mercedes-Benz GLA
HU64 emergency blade, FBS3 system.
HU64 emergency blade, FBS4 system.
Mercedes-Benz GLB
HU64 emergency blade, FBS4 system. Dealer / advanced tool for add-key.
Which is simpler or quicker to key?
On a lost-all-keys job the Mercedes-Benz GLA is usually the more straightforward of the two, since it is typically handled entirely on-site through the OBD-II port. Some Mercedes-Benz GLB year ranges can require a manufacturer PIN or dealer coordination, which adds steps to the job. With a working key in hand, either one has a spare programmed on-site the same visit.
The quirk that trips people up on each
- FBS3 vs. FBS4 path. The GLA's immobilizer generation dictates the whole job; an FBS4 all-keys-lost usually means dealer coordination.
- FBS4-only car. Every GLB is FBS4, so protect your last fob; an all-keys-lost generally means dealer coordination, not a quick on-site cut.
How a key job runs on either one
The path works the same way on both. The simplest job on either vehicle is a planned spare made while you still have a working key, because that key acts as the authentication seed and the work is short. A lost-all-keys situation takes more steps on either one, since the programmer has to read the immobilizer PIN before it can enroll a new key. We confirm the exact part by VIN before we dispatch, so the right blank, chip, and programmer are on the truck when we arrive.
Get a replacement key in Statesboro, GA
We are a mobile automotive locksmith and we come to you anywhere in Statesboro, Bulloch County, and southeast Georgia, no tow and no dealership wait, for both the Mercedes-Benz GLA and the Mercedes-Benz GLB. Call (912) 209-6131.
Compare the full guides
- Mercedes-Benz GLA key replacement guide, all years and key types
- Mercedes-Benz GLB key replacement guide, all years and key types
- All Mercedes-Benz car keys
- All Mercedes-Benz car keys
Frequently asked: Mercedes-Benz GLA vs Mercedes-Benz GLB keys
Is the Mercedes-Benz GLA or the Mercedes-Benz GLB simpler to make a key for?
For a routine spare both are similar, but the Mercedes-Benz GLA tends to be the more straightforward of the two on a lost-all-keys job, because some Mercedes-Benz GLB years can need dealer or PIN coordination. We confirm the exact path for each by VIN before dispatching so there are no surprises.
Can you make a key for both on-site in Statesboro?
Yes. Both the Mercedes-Benz GLA and the Mercedes-Benz GLB are handled by our mobile unit at your location for the large majority of year ranges. Any exception that needs dealer coordination is flagged on the phone when we confirm your VIN, so the work is set up correctly before we arrive.
Do I need the original key to get a replacement?
No. With a working key we make a spare in a single visit because the original acts as the authentication seed. With no key at all, we read the immobilizer PIN and build a key from your VIN. Both vehicles support both paths.