Mercedes-Benz · Known Issues

2020 Mercedes-Benz SL-Class Problems: 3 Known Issues

2020 model year · 2,330+ owner reports · Updated September 2026

According to Au7o's analysis of 2,330+ owner reports, the 2020 Mercedes-Benz SL-Class has 3 documented known issues. No issues are rated critical, indicating generally reliable ownership. The most commonly reported issue is Retractable Hardtop Hydraulic System Failure with 1,500 owner reports. Across all issues with published estimates, repair costs range from $800 to $5,000. DIY maintenance guides at au7o.io.

Frequently Asked Questions

What are the most common Mercedes-Benz SL-Class problems?

According to Au7o's analysis of 2,330+ owner reports, the 2020 Mercedes-Benz SL-Class has 3 documented issues. The most frequently reported are: Retractable Hardtop Hydraulic System Failure, Timing Chain Variator Noise on M276/M278 Engines, COMAND Infotainment System Freeze and Black Screen. None are rated critical, but regular maintenance is recommended.

Is the Mercedes-Benz SL-Class reliable?

The 2020 Mercedes-Benz SL-Class has 3 known issues documented across 2,330+ owner reports. No issues are rated critical, suggesting generally good reliability. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Mercedes-Benz SL-Class problems?

Repair costs for known Mercedes-Benz SL-Class issues range from $800 to $5,000, depending on the specific problem and whether you choose DIY or professional repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2003-2020 Mercedes-Benz SL-Class Retractable Hardtop Hydraulic System Failure?

The Vario Roof retractable hardtop system on both R230 and R231 SL models develops hydraulic cylinder leaks, pump failures, and microswitch faults that prevent the top from opening or closing. The complex system uses multiple hydraulic cylinders, position sensors, and a controlle… Repairs typically run $800-$4,000. Severity: medium.

What is the 2013-2020 Mercedes-Benz SL-Class Timing Chain Variator Noise on M276/M278 Engines?

The R231 SL with M276 V6 or M278 V8 engines develops a distinctive rattling noise from the timing chain area on cold starts. The cam adjuster magnets (variators) lose oil pressure overnight, allowing the chains to slap against the guides until oil pressure builds. This noise wors… Repairs typically run $2,000-$5,000. Severity: medium.

What is the 2013-2020 Mercedes-Benz SL-Class COMAND Infotainment System Freeze and Black Screen?

The COMAND NTG5 infotainment system in R231 SL models experiences frequent freezing, black screen events, and slow response to inputs. The system processes navigation, audio, phone, and vehicle settings, and a freeze renders all these functions unavailable. Hot weather and direct… Severity: low.

2020 Mercedes-Benz SL-Class Problems: 3 Known Issues

All 3 Known Issues

2003-2020 Mercedes-Benz SL-Class: Retractable Hardtop Hydraulic System Failure#

Common Symptoms

How to Fix

What you need to fix it

Owner tips & cautions

Research This Issue

2013-2020 Mercedes-Benz SL-Class: Timing Chain Variator Noise on M276/M278 Engines#

Common Symptoms

How to Fix

What you need to fix it

Owner tips & cautions

Research This Issue

2013-2020 Mercedes-Benz SL-Class: COMAND Infotainment System Freeze and Black Screen#

Common Symptoms

How to Fix

Owner tips & cautions

Research This Issue

Other Mercedes-Benz Models

Frequently Asked Questions

What are the most common Mercedes-Benz SL-Class problems?

Is the Mercedes-Benz SL-Class reliable?

How much does it cost to fix common Mercedes-Benz SL-Class problems?

What is the 2003-2020 Mercedes-Benz SL-Class Retractable Hardtop Hydraulic System Failure?

What is the 2013-2020 Mercedes-Benz SL-Class Timing Chain Variator Noise on M276/M278 Engines?

What is the 2013-2020 Mercedes-Benz SL-Class COMAND Infotainment System Freeze and Black Screen?