ExhaustHigh
DPF, EGR and AdBlue faults on 2.1 and 2.0 diesels
- Typically appears
- 70,000+ miles
- What to inspect
- Check AdBlue countdown and warning history
2015–2023 Mercedes-Benz GLC · common problems & known faults
A mid-size premium SUV with strong family demand. Diesel emissions hardware and optional air suspension lead the inspection.
Compiled & reviewed by the VehicleFaults Research Team · last reviewed August 2026
Quick answer
The most commonly reported faults on the 2015–2023 Mercedes-Benz GLC are DPF, EGR and AdBlue faults on 2.1 and 2.0 diesels, Air Body Control leaks on optioned cars and 9G-Tronic harsh shifts without fluid servicing. 2 of the documented issues are rated high severity · inspect these first. Full inspection points, onset mileage and what to check are listed below.
Reliability snapshot
Based on the documented faults on this page for the Mercedes-Benz GLC.
6.7/ 10
- Critical
- 0
- High
- 2
- Medium
- 2
- Low
- 0
Guidance only · reflects reported patterns, not a specific car's condition.
Known faults to check
SuspensionHigh
Air Body Control leaks on optioned cars
- Typically appears
- 70,000+ miles
- What to inspect
- Check overnight ride height and cycle drive modes
TransmissionMedium
9G-Tronic harsh shifts without fluid servicing
- Typically appears
- 80,000+ miles
- What to inspect
- Ask for gearbox oil evidence and test kickdown
ElectricalMedium
COMAND, camera and parking sensor faults
- Typically appears
- Age-related
- What to inspect
- Test all cameras and sensors, including the 360 system
Inspecting a Mercedes-Benz GLC?
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Check this exact carFrequently asked questions
Is the GLC a safe stock choice?
Yes with history. It has broad appeal and holds value better than most rivals in its class.
What is the big-ticket risk?
Air suspension on optioned cars, followed by emissions hardware on high-mileage diesels.
Which engine sells best?
The 220d. It matches what UK family buyers expect for running costs and towing.
Sources & further reading
Faults are compiled from documented recalls, technical bulletins, owner reports and mechanic sources, then reviewed for accuracy. This is guidance only · not a substitute for a professional inspection.