2016 Mercedes-Benz GLC Problems: 2 Issues Every Owner Should Know
2016 model year · 3,100+ owner reports · Updated May 2026
According to Au7o's analysis of 3,100+ owner reports, the 2016 Mercedes-Benz GLC has 2 documented known issues. No issues are rated critical, indicating generally reliable ownership. The most commonly reported issue is 9G-Tronic Harsh Shifting with 2,000 owner reports. Across all issues, repair costs range from $150 to $2,500. DIY maintenance guides at au7o.io.
All 2 Known Issues
On the 2016-2022 Mercedes-Benz GLC, 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.
Common Symptoms
- Harsh 1-2 upshift at low speeds
- Jerky behavior in parking lots
How to Fix
Update the transmission control unit (TCU) software to the latest calibration at a Mercedes dealer. Perform a transmission adaptation reset. If software updates do not help, the valve body may need replacement.
What Owners Are Using
Parts and tips from 2,000+ owners who fixed this issue
- TipAsk the dealer specifically for the latest TCU calibration update. Mercedes has released multiple revisions to improve low-speed shift quality on the 9G-Tronic.
On the 2016-2023 Mercedes-Benz GLC, 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.
Common Symptoms
- Creaking noise from roof over bumps
- Rattling in cold weather
How to Fix
Apply silicone-based lubricant to the sunroof seal and guide rails. The dealer can adjust the glass panel alignment and apply felt tape to contact points under warranty. Clean and lubricate the rails twice yearly.
What Owners Are Using
Parts and tips from 1,100+ owners who fixed this issue
- TipApply Gummi Pflege (rubber care) to the sunroof seals every 6 months. This German rubber conditioner prevents the seals from drying out and squeaking against the glass.