2025 Mercedes-Benz GLC Problems: 5 Known Issues
2025 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated October 2026
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2025 Mercedes-Benz GLC has 5 documented known issues, with 4 rated critical. The most serious are 12V Board-Net Parasitic Drain from Door Control Modules Leaving X254 GLC Stranded ($0-$600 repair), Infotainment Control Unit Reset Blanking the Instrument Cluster While Driving (Recall 26V281) ($0-$0 repair), Steering Coupling Bolt Loosening / Loss of Steering Control (Recall) and 48V Mild-Hybrid (EQ Boost) Integrated Starter-Generator Failure ($1,000-$7,000 repair). Across all issues with published estimates, repair costs range from $1,000 to $7,000. DIY maintenance guides at au7o.io.
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Frequently Asked Questions
What are the most common Mercedes-Benz GLC problems?
According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2025 Mercedes-Benz GLC has 5 documented issues. The most frequently reported are: 12V Board-Net Parasitic Drain from Door Control Modules Leaving X254 GLC Stranded, Infotainment Control Unit Reset Blanking the Instrument Cluster While Driving (Recall 26V281), Steering Coupling Bolt Loosening / Loss of Steering Control (Recall). Of these, 4 are rated critical and should be addressed promptly.
Is the Mercedes-Benz GLC reliable?
The 2025 Mercedes-Benz GLC has 5 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 4 issues are rated critical: 12V Board-Net Parasitic Drain from Door Control Modules Leaving X254 GLC Stranded and Infotainment Control Unit Reset Blanking the Instrument Cluster While Driving (Recall 26V281) and Steering Coupling Bolt Loosening / Loss of Steering Control (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, 12V Board-Net Parasitic Drain from Door Control Modules Leaving X254 GLC Stranded, typically costs $0-$600 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
What is the 2023-2025 Mercedes-Benz GLC 12V Board-Net Parasitic Drain from Door Control Modules Leaving X254 GLC Stranded?
Owners of the second-generation X254 GLC report the 12V system going flat after only a few days parked, with a "12V Battery Low" message and, in a number of cases, a no-start and a tow. This is separate from the 48V mild-hybrid starter-generator failure: here the 48V system is he… Repairs typically run $0-$600. Severity: high.
What is the 2025-2026 Mercedes-Benz GLC Infotainment Control Unit Reset Blanking the Instrument Cluster While Driving (Recall 26V281)?
On MBUX-equipped X254 GLC models the infotainment control unit software can trigger an increased number of system resets, as part of an intended fallback behavior, while the vehicle is in motion. Because the digital instrument cluster is driven through that unit, the reset takes… Repairs typically run $0-$0. Severity: high.
What is the 2023-2026 Mercedes-Benz GLC Steering Coupling Bolt Loosening / Loss of Steering Control (Recall)?
Recall 25V533 directly covers model-year 2023-2026 GLC 300 and GLC 300 4MATIC vehicles whose steering-coupling bolt may not have been torqued to production specifications. The connection can loosen over time, potentially causing loss of steering control and increasing crash risk. Severity: high.
What is the 2023-2025 Mercedes-Benz GLC 48V Mild-Hybrid (EQ Boost) Integrated Starter-Generator Failure?
GLC 300 models of the second-generation (X254, 2023-on) GLC with the M254 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/overh… Repairs typically run $1,000-$7,000. Severity: high.
What is the 2023-2025 Mercedes-Benz GLC Panoramic-Roof GLC Rear Head-Impact Protection Noncompliance (Recall 25V379)?
Recall 25V379 covers certain panoramic-roof X254 GLC SUVs. Rear roof-lining damping may be too stiff for the specified FMVSS 201u unbelted head-impact test, creating a risk of excessive head-injury criteria in the defined no-airbag-deployment scenario. The filing lists 92,739 veh… Repairs typically run $0-$0. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.