Mercedes GLB Problems: What To Know Before Buying
The Mercedes-Benz GLB is a versatile compact SUV known for combining rugged design with premium features. Its standout offering is a rare third-row seating option in a small luxury SUV, making it ideal for families seeking extra flexibility. However, as with any model, the GLB has a few issues buyers should be aware of. If you’re considering a new or used GLB — especially the X247 generation launched in 2019 — here are the most common Mercedes GLB problems to look out for.
1. Dual-Clutch Transmission Hesitation
Many GLB models are equipped with a 7- or 8-speed dual-clutch automatic transmission. While efficient, this system can show hesitation at lower speeds.
Typical symptoms:
- Jerky or delayed gear changes
- Hesitation from a stop
- Difficulty engaging reverse
- Transmission warning lights
Ensure that the transmission has been serviced on time and software updates applied to improve performance.
2. MBUX Infotainment System Glitches
The GLB uses Mercedes’ MBUX infotainment system, which includes a large touchscreen, voice control, and smartphone integration. Despite its advanced features, it can occasionally glitch.
Reported issues:
- Frozen or slow touchscreen
- Bluetooth or Apple CarPlay connectivity issues
- Voice command malfunction
- Navigation misrouting
Most of these problems are software-related and can be resolved with updates from a Mercedes dealer.
3. Electrical and Sensor Faults
The GLB is equipped with numerous driver assistance systems, which depend on a network of sensors and cameras. These can sometimes produce errors.
Typical issues:
- Lane keep assist or blind spot monitoring errors
- False proximity warnings
- ADAS (Advanced Driver Assistance Systems) alerts
- Radar or camera module faults
Proper diagnostic scans and sensor recalibrations usually resolve these problems.
4. Suspension and Ride Quality Issues
While the GLB offers a generally smooth ride, AMG Line models with larger wheels may feel firmer, especially on poor road surfaces.
Common complaints:
- Knocking noises from suspension
- Premature tyre wear
- Harshness at low speeds
A thorough inspection of struts, bushings, and mounts is recommended during a pre-purchase check.
5. Interior Rattles and Fitment Issues
Some owners have reported minor interior rattles, especially from the rear third-row seats and dashboard trim.
What to check:
- Rattles over bumps or rough roads
- Loose trim or plastic panel noises
- Seat latch or rail movement sounds
Though not mechanical problems, these can impact cabin comfort in day-to-day driving.
6. Third-Row Limitations
While the GLB offers a rare third-row option in its class, space is limited and best suited for children or short trips.
Things to consider:
- Cramped seating for adults
- Difficult access to the third row
- Minimal cargo space with all seats up
Test seating comfort and boot space to ensure it meets your needs.
Final Thoughts: Is the Mercedes GLB a Good Buy?
Yes — the GLB offers great practicality, premium features, and the flexibility of optional third-row seating. Most known problems are minor and primarily related to software or comfort rather than mechanical reliability.
Before buying:
- Request a full service history
- Ensure all software updates and recalls have been completed
- Test drive thoroughly to assess transmission, electronics, and ride comfort
- Inspect the interior for trim wear or rattles
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