Mercedes-Benz brand mark

Is the 2019–2025 Mercedes-Benz GLB reliable?

Scored from 8 documented faults · reviewed by the VehicleFaults Research Team

Quick answer

6.0/ 10
Mixed

On our documented-fault scoring the Mercedes-Benz GLB rates 6.0 out of 10 · mixed. We hold 8 known faults for it and 1 are rated high severity, so the risk is real but contained. The weak points cluster around transmission, electrical and engine. A well-serviced example with evidence for the big-ticket items is usually a safe buy; the score describes the model, not the specific car in front of you.

Verdict · Negotiate · budget for the known faults

What the score is built from

Critical
0
High
1
Medium
4
Low
3

Weak points cluster around transmission, electrical, engine, suspension.

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The faults that decide it

Exhaust/EmissionsHigh

AdBlue countdown warning or Engine Management Light (EML) due to NOx sensor failure on OM654q diesel variants.

Typically appears
40,000-70,000 miles
What to inspect
Turn the ignition on, cycle through the driver display to check the AdBlue level, and look for any active EML or 'Engine Start Not Possible' mileage countdown messages.
Typical repair
Exhaust / emissions component · £200–£950
TransmissionMedium

7G-DCT dual-clutch gearbox hesitation and jerky low-speed shifts

Typically appears
40,000+ miles
What to inspect
Drive from cold in traffic and feel for hesitation or jerky changes
Typical repair
DCT clutch pack / mechatronic work · £900–£3,200
ElectricalMedium

MBUX infotainment freezes and connectivity dropouts

Typically appears
Age-related
What to inspect
Cycle through infotainment functions and test phone connectivity
Typical repair
Infotainment repair or software fix · £120–£1,200
EngineMedium

Turbo petrol carbon build-up on direct injection units

Typically appears
50,000+ miles
What to inspect
Check for rough idle or hesitation and listen for injector noise
Typical repair
Turbocharger replacement · £750–£2,200
Body/ExteriorMedium

Water ingress into the cabin and wind deflector jamming on models equipped with the panoramic sunroof.

Typically appears
3-5 years
What to inspect
Open the sunroof fully to check the pop-up wind deflector mesh for tears or sagging. Press your hand firmly into the front footwell carpets to check for dampness.
Typical repair
Water-ingress trace & seal · £150–£800

Costs are indicative UK independent-garage bands for budgeting and negotiation · never a quote.

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