What are the most common Mercedes-Benz GLC problems?
According to Au7o's analysis of 4,200+ owner reports, the 2021 Mercedes-Benz GLC has 7 documented issues. The most frequently reported are: Air Suspension Compressor Failure, Fuel Pump Shutdown Causing Loss of Drive Power (Recall), 48V Mild-Hybrid (EQ Boost) Integrated Starter-Generator Failure. Of these, 3 are rated critical and should be addressed promptly.
Is the Mercedes-Benz GLC reliable?
The 2021 Mercedes-Benz GLC has 7 known issues documented across 4,200+ owner reports. 3 issues are rated critical: Air Suspension Compressor Failure and Fuel Pump Shutdown Causing Loss of Drive Power (Recall) and 48V Mild-Hybrid (EQ Boost) Integrated Starter-Generator Failure. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
How much does it cost to fix common Mercedes-Benz GLC problems?
Repair costs for known Mercedes-Benz GLC issues range from $0 to $7,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Air Suspension Compressor Failure, typically costs $600-$2,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2020-2025 Mercedes-Benz GLC Air Suspension Compressor Failure?
GLC models equipped with optional AIRMATIC air suspension experience premature compressor failure. The compressor overheats from compensating for minor air spring leaks and eventually burns out, leaving the vehicle in a lowered position. Repairs typically run $600-$2,000. Severity: high.
What is the 2021-2023 Mercedes-Benz GLC Fuel Pump Shutdown Causing Loss of Drive Power (Recall)?
The fuel pump impeller on certain 2021-2023 GLC vehicles may not meet material specifications, allowing the fuel pump to shut down and causing a sudden loss of drive power while driving. This was the subject of a large NHTSA recall covering 143,551 Mercedes vehicles across multip… Repairs typically run $0-$0. Severity: high.
What is the 2020-2023 Mercedes-Benz GLC 48V Mild-Hybrid (EQ Boost) Integrated Starter-Generator Failure?
GLC 300 models with the M264 engine use a 48-volt mild-hybrid system with an Integrated Starter-Generator (ISG) mounted between the engine and transmission, fed by a small lithium-ion battery. The ISG, its 48V battery, or a loose/overheating 48V ground connection can fail, trigge… Repairs typically run $1,000-$7,000. Severity: high.
What is the 2016-2022 Mercedes-Benz GLC 9G-Tronic Harsh Shifting?
The 9G-Tronic (725.0) nine-speed automatic transmission exhibits harsh downshifts and jerky low-speed behavior, particularly the 1-2 and 2-1 shifts. The transmission software struggles with the many gear ratios at parking lot speeds. Repairs typically run $150-$2,500. Severity: medium.
What is the 2016-2023 Mercedes-Benz GLC Cold-Start Camshaft Adjuster (Magnet/Solenoid) Rattle?
On the M274/M264 2.0L turbo engines used in the GLC, the intake camshaft adjuster relies on an internal locking pin that wears over time. Without oil pressure at cold start, the adjuster fails to lock in its default position, producing a distinct metallic rattle for 2-4 seconds o… Repairs typically run $800-$2,500. Severity: medium.
What is the 2016-2023 Mercedes-Benz GLC Panoramic Sunroof Creak and Rattle?
The panoramic sunroof develops creaking and rattling noises over bumps and temperature changes. The glass panel expands and contracts differently than the metal frame, creating friction-induced squeaks especially in cold weather. Repairs typically run $0-$500. Severity: low.
What is the 2020-2025 Mercedes-Benz GLC MBUX Infotainment System Freeze?
The MBUX infotainment system freezes, reboots, or displays a black screen. Bluetooth connections drop, Apple CarPlay/Android Auto disconnects randomly, and the voice assistant becomes unresponsive. Repairs typically run $0-$2,000. Severity: low.
