2019–2025 Mercedes-Benz GLB · common problems & known faults

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

MBUX infotainment freezes and connectivity dropouts

Typically appears

Age-related

What to inspect

Cycle through infotainment functions and test phone connectivity

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

Front strut and bush wear from heavier third-row loading

Typically appears

50,000+ miles

What to inspect

Check for clonks over bumps and inspect bushes for perishing

Third row seat mechanism stiffness and folding issues

Typically appears

Age-related

What to inspect

Fold and deploy the third row seats fully to check smooth operation

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.

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.

Accelerated rear brake pad wear, often depleting significantly faster than the fronts due to aggressive ESP torque vectoring and electronic parking brake drag.

Typically appears

20,000-30,000 miles

What to inspect

Shine a torch through the rear alloy wheel spokes to visually assess the remaining friction material on the outer rear brake pads and check for heavy disc scoring.