AI Damage2026 Mercedes-Benz GLS 450 4matic: common problems
The maker issued 51 service bulletins for this year. Details by component below, with sources.
Key figures
- Technical service bulletins (TSB)
- 51
Components owners complain about
| Component | Owner complaints | involving a crash | Technical service bulletins (TSB) |
|---|---|---|---|
| Electrical system | 0 | 0 | 24 |
| Structure | 0 | 0 | 7 |
| Steering | 0 | 0 | 6 |
| Service brakes | 0 | 0 | 5 |
| Visibility | 0 | 0 | 5 |
| Suspension | 0 | 0 | 4 |
| Powertrain | 0 | 0 | 3 |
| Exterior lighting | 0 | 0 | 2 |
| Air bags | 0 | 0 | 1 |
| Backover prevention | 0 | 0 | 1 |
| Engine | 0 | 0 | 1 |
| Lane departure | 0 | 0 | 1 |
| Other | 0 | 0 | 2 |
Comparison
What to check before buying
- Electrical system. Scan all modules, test the battery and alternator, inspect connectors near the impact zone.
- Structure. Rails, pillars, panel gaps, signs of pulling or welding.
- Steering. Steering play, power assist, rack and tie rods after a wheel impact.
- Service brakes. Pedal feel, ABS operation, leaks, discs and hoses.
Manufacturer service bulletins
Bulletin titles as filed with NHTSA.
- Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject…
Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the control unit software for the front signal acquisition and actuation module (SAM-F) may not correspond…
- Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject…
Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the transmission control unit (VGS) in the automatic transmission does not meet current MBAG…
- Complaint Clanking noise from the area of the speakers in the doors
Cause Under analysis. Remedy To narrow down the cause, first of all remove the door trim. • If the noise continues to occur even with the door trim removed, then continue the diagnosis working towards the speaker and…
- Complaint Slight creaking noises when steering
Cause Noises may come from one or more sleeves of the horn contact plate. Remedy Remove the horn contact plate and check the sleeves for noise; see attached video. If necessary, apply lubricant to the sleeves.
- Complaint Repeat workshop visit for vehicle vibration while braking from 60MPH. NOTE
Although the symptom is similar to a tire or wheel vibration, it is usually readily noticeable that it is distinctly different if it happens at all times or only while braking. Cause Although the cause of the vibration…
- Complaint Red coolant warning in instrument cluster
Fault codes U019F00 or U019F87 current/stored in MRG1 control unit. Cause Various causes Remedy Perform guided test for fault code U019F with XENTRY diagnosis. Verify the following connections are clean and tight…
- Complaint Radio station cover art does not refresh when switching stations
The UI continues to show the old station’s artwork instead of updating to the new one. Cause When a new station change request is triggered, a temporary glitch is causing the Head Unit application to fail to overwrite…
- Complaint Whining / humming noises (described as foghorn‑like) from the drivetrain in the rear axle area…
Complaint Whining / humming noises (described as foghorn‑like) from the drivetrain in the rear axle area during cornering. (figure 1) On the above‑mentioned vehicles with a mileage up to 15,000 km (about 9,300 mi)…
- Complaint Traffic sign symbol for "Traffic Sign Assist" is blinking in instrument cluster without obvious…
Complaint Traffic sign symbol for "Traffic Sign Assist" is blinking in instrument cluster without obvious cause usually with one of the following scenarios: • Flashing without a speed limit ("‑ ‑"). • Flashing when…
- Complaint Customer concern of Air Conditioning not cooling
*NOTE ‑ Use of tracer DYE for leak checks is not approved. Only approved leak check procedures as per WIS are approved. Cause Possible refrigerant leak. Remedy Perform the following measures : *Important* ‑ Photo…
- Complaint CEL light on with no drivability concerns. Cause Signal timing error. Remedy 167, 465
SW has been released. Update the FSAM to the latest SW version. 290, 118, 243, 247: Software is still in development. This fault code does not cause a drivability concern and will clear itself within 2‑ 3 key cycles…
- Complaint When coming to a stop or at slow speeds, brakes produce light squealing noise
Cause Optimized brake pads may produce some noise and is normal at low speeds and light pressure. If the noise begins when the weather is colder, brake noise during this time is normal and the below remedy will not…
NHTSA lists 51 bulletins for this year; the 12 newest are shown here.
Other years of this model
Questions and answers
What are the most common problems with the 2026 Mercedes-Benz GLS 450 4matic?
There are no owner complaints in the NHTSA data for this year; the data comes from 51 manufacturer service bulletins.
How many service bulletins (TSB) were issued for the 2026 Mercedes-Benz GLS 450 4matic?
NHTSA lists 51 manufacturer service bulletins for this year. A bulletin tells dealers how to diagnose or fix a known issue; it is not a recall.
Should I buy a 2026 Mercedes-Benz GLS 450 4matic from a US auction?
Owner complaints describe defects, not crash damage. Before bidding, check the components listed above and review the lot photos: VinWind builds a report of visible and hidden damage by VIN.
Other 2026 models
Read also
Sources: public NHTSA data (USA): service bulletins and owner complaints; YouTube: links to videos credited to their authors. Complaints are owner statements not verified by NHTSA, and describe defects rather than crash damage. Data updated 2026-11-04.