2020 Mercedes-benz Glc350 problems

Common 2020 Mercedes-benz Glc350 problems

Based on the complaints from owners of the 2020 Mercedes-Benz GLC 350, several common problems have been reported:

1. Gas Cap Issues:
   • One of the most common causes of the check engine light coming on is a loose, broken, or missing gas cap. The gas cap serves multiple purposes, including preventing hazardous gas fumes from being released, sealing the fuel system, and maintaining pressure within the fuel tank. If the gas cap is defective, it can lead to fuel loss through evaporation, resulting in more frequent trips to the pump and increased expenses.
2. Aftermarket Items:
   • Issues with aftermarket alarms, exhaust systems, or other components can cause significant problems with the GLC 350 if not installed correctly. Poor installation of aftermarket items can drain the battery, trigger the check engine light, or even prevent the vehicle from starting. Ensuring that aftermarket items are installed accurately is crucial to avoid damage and costly repairs.
3. Vacuum Leak:
   • A vacuum leak in the Mercedes-Benz GLC 350 can lead to high RPM in idle or random surges. Over time, vacuum hoses can dry out and crack, especially when exposed to extreme temperatures. Identifying and fixing vacuum leaks promptly is essential to maintain the vehicle's performance and efficiency.
4. Catalytic Converter Issues:
   • Problems with the catalytic converter, which is part of the exhaust system, can arise due to neglected maintenance. A malfunctioning catalytic converter can lead to emission test failures, reduced engine performance, poor fuel economy, and higher operating temperatures. Timely maintenance and repairs are crucial to prevent further damage.
5. Oxygen Sensor (O2 Sensor) Malfunction:
   • The O2 sensor measures oxygen levels in the exhaust system, affecting fuel economy and engine performance. A defective O2 sensor can lead to decreased fuel efficiency, damage to the catalytic converter, and issues with spark plugs. Failing to replace a faulty O2 sensor can also result in emissions test failures.
6. Battery Problems:
   • A low or dead battery can cause various issues in the GLC 350, affecting the vehicle's ability to start, illuminate the road, operate electronic features, and charge devices. While modern vehicle batteries are more durable, ensuring the battery is in good condition is essential for the proper functioning of the vehicle.

These common problems reported by owners of the 2020 Mercedes-Benz GLC 350 highlight the importance of regular maintenance, prompt repairs, and attention to detail when installing aftermarket components to ensure the vehicle's optimal performance and longevity.

What are the most common problems with Mercedes GLC?

What are the most common problems with a used Mercedes GLC estate? Some GLCs have been known to make noises when full lock is applied and the steering also seem to be susceptible to a problem known as 'crabbing', where the wheels on one axle of the car appear to be out of alignment with those on the other.

Is the GLC 350e discontinued?

Updates for 2022 include standard adaptive high-beam assist, and the 350e was discontinued.

Is Mercedes GLC a reliable car?

Mercedes GLC reliability

In our ownership survey, the GLC finished in 38th place overall from 75 cars, with owners praising its safety technology and design. Running costs were less favourable, though, which includes expensive servicing costs and middling reliability.

Which GLC engine is best?

Every version of the GLC comes with plenty of standard equipment, so we think you're best sticking with the entry-level AMG Line model. Likewise, we recommend the entry-level 220d diesel engine because it has plenty of power and helps to keep the cost down.