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
- Typical repair
- DPF forced regen or replacement · £250–£1,600
Is the 2015–2023 Mercedes-Benz GLC reliable?
Scored from 8 documented faults · reviewed by the VehicleFaults Research Team
Quick answer
4.6/ 10
Buy with cautionOn our documented-fault scoring the Mercedes-Benz GLC rates 4.6 out of 10 · buy with caution. We hold 8 known faults for it and 3 are rated high severity, so the risk is real but contained. The weak points cluster around exhaust, suspension and transmission. 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 · Walk unless the history is spotless
What the score is built from
- Critical
- 0
- High
- 3
- Medium
- 3
- Low
- 2
Weak points cluster around exhaust, suspension, transmission, electrical.
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Check this carThe faults that decide it
SuspensionHigh
Air Body Control leaks on optioned cars
- Typically appears
- 70,000+ miles
- What to inspect
- Check overnight ride height and cycle drive modes
- Typical repair
- Suspension refresh (per axle) · £250–£1,100
EngineHigh
Sharp metallic rattling noise from the rear of the engine bay on cold start indicating timing chain stretch (OM651 2.1L diesels).
- Typically appears
- 70,000-100,000 miles
- What to inspect
- Open the bonnet, stand near the bulkhead, and have a colleague perform a cold start. Listen for a chain rattle lasting 3-5 seconds.
- Typical repair
- Timing chain, tensioner & guides · £900–£2,400
TransmissionMedium
9G-Tronic harsh shifts without fluid servicing
- Typically appears
- 80,000+ miles
- What to inspect
- Ask for gearbox oil evidence and test kickdown
- Typical repair
- Routine repair · £180–£700
ElectricalMedium
COMAND, camera and parking sensor faults
- Typically appears
- Age-related
- What to inspect
- Test all cameras and sensors, including the 360 system
- Typical repair
- Electrical diagnosis & module repair · £120–£900
Costs are indicative UK independent-garage bands for budgeting and negotiation · never a quote.
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