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Mercedes-Benz · Known Issues

2017 Mercedes-Benz SL-Class Problems: 3 Known Issues

2017 model year · 2,330+ owner reports · Updated September 2026

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Issue summary

According to Au7o's analysis of 2,330+ owner reports, the 2017 Mercedes-Benz SL-Class has 3 documented known issues. None of the listed issues is rated critical; this is not a complete reliability assessment. 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.

In This Article

  • SL-Class Body/Panels1
  • SL-Class Engine1
  • SL-Class Electrical1
  • FAQ
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In This Article

  • Body/Panels1
  • Engine1
  • Electrical1
  • FAQ

All 3 Known Issues

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ALL YEARS2025202420232022202020192018201720162015201420132012201120102009200820072006200520042003
Community reported
1,500 owners

On the 2003-2020 Mercedes-Benz SL-Class, 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 controller that all must function in sequence. Any single component failure stops the entire operation.

This issue also affects: Mercedes-Benz G-Class, Mercedes-Benz SLC, Mercedes-Benz M-Class

Common Symptoms

  • Top stops mid-cycle and will not complete
  • Roof warning message on dashboard
  • Hydraulic pump running but top not moving
  • Top will not latch closed
  • Slow top operation

How to Fix

Diagnose with Star Diagnostics to identify the specific failed component in the sequence. Common failures include the hydraulic pump, roof lock actuators, and microswitches. Hydraulic fluid level should be checked and topped off. Replace only the failed component rather than the entire system when possible.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Genuine Mercedes Vario Roof hydraulic oil 000989020609
    OEMMercedes-Benz A000989020609 / MB 346.0

    Post-repair refill and bleeding of the R230 or R231 Vario Roof hydraulic circuit Fitment/availability: Mercedes operating-fluid sheet 346.0 lists A0009890206 for R230 and R231 roof hydraulics. The inspected direct U.S.

    MB Parts Giant

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Owner tips & cautions

  • TipNever force the top if it stops mid-cycle. Let it return to its starting position and diagnose the fault. Forcing it can bend the mechanism and turn a $500 repair into a $4,000 one.
Typical repair cost:$800 - $4,000

Research This Issue

Based on 1,500 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
High Confidence1,500 owner reportsLast reported by owners Nov 2025Reviewed Mar 2026
Community reported
450 owners

On the 2013-2020 Mercedes-Benz SL-Class, 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 worsens over time and can eventually lead to stretched chains and timing issues.

This issue also affects: Mercedes-Benz B-Class, Mercedes-Benz CLA, Mercedes-Benz E-Class

Common Symptoms

  • Rattling noise on cold start lasting 2-5 seconds
  • Check engine light with camshaft timing codes
  • Noise worsening over time
  • Slight rough idle when cold

How to Fix

Replace the timing chain tensioners and cam adjuster magnets (variators). Updated parts are available that improve oil retention. In advanced cases, the timing chains and guides should also be replaced. Use only Mercedes-approved 0W-40 or 5W-30 oil to maintain proper cold-start viscosity.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • Genuine Mercedes small-bore cylinder-head oil check valve A2780504000
    OEMMercedes-Benz A2780504000

    Use only within the engine cutoff after bore measurement; two of

    FCP Euro
  • Genuine Mercedes staged-8mm-bore cylinder-head oil check valve A2780503300
    OEMMercedes-Benz A2780503300

    Use only within the engine cutoff after bore measur

    FCP Euro
  • Febi M276 early left secondary-chain tensioner A2760502300
    OEMFebi / Mercedes A2760502300

    Left tensioner through M276 engine 2769xx 30 129268 when LI05.10-P-056435 calls for tensioners Fitment/availability: The reviewed direct product/catalog destination identifies Febi 2760502300 for M276 applications. Use only with matching…

    FCP Euro
  • Febi M276 early right secondary-chain tensioner A2760502400
    OEMFebi / Mercedes A2760502400

    Right tensioner through M276 engine 2769xx 30 129268 when LI05.10-P-056435 calls for tensioners Fitment/availability: The inspected direct U.S. Use only with matching left 2760502300 through engine 129268 and only within

    FCP Euro
  • Genuine Mercedes M276 later left secondary-chain tensioner A2760502500
    OEMMercedes-Benz A2760502500

    Left tensioner from M276 engine 2769xx 30 129269 through the bulletin tensioner cutoff Fitment/availability: The inspected direct U.S. Use only with matching right 2760502600 from engine 129269 through 365996 when the

    FCP Euro
  • Genuine Mercedes M276 later right secondary-chain tensioner A2760502600
    OEMMercedes-Benz A2760502600

    Right tensioner from M276 engine 2769xx 30 129269 through the bulletin tensioner cutoff Fitment/availability: The inspected direct U.S. Use only with matching left 2760502500 from engine 129269 through 365996 when the

    FCP Euro
  • Genuine Mercedes M278/M157 early left secondary-chain tensioner A2780501300
    OEMMercedes-Benz A2780501300

    Early left tensioner for the bulletin branch through M278 engine 035185 or M157 engine 009366 Fitment/availability: The inspected direct U.S. Use only with matching right 2780501400 through the applicable engine

    FCP Euro
  • Genuine Mercedes M278/M157 early right secondary-chain tensioner A2780501400
    OEMMercedes-Benz A2780501400

    Early right tensioner for the bulletin branch through M278 engine 035185 or M157 engine 009366 Fitment/availability: The inspected direct U.S. Use only with matching left 2780501300 through the applicable engine

    FCP Euro
  • Genuine Mercedes current later left M278/M157 tensioner A2780504700
    OEMMercedes-Benz A2780504700; supersedes A2780501500

    Current replacement for later left A2780501500 within the bulletin tensioner branch Fitment/availability: The inspected direct U.S. page identifies genuine 2780504700 and showed it in stock with price and purchase controls; catalog subst…

    FCP Euro
  • Genuine Mercedes current later right M278/M157 tensioner A2780504800
    OEMMercedes-Benz A2780504800; supersedes A2780501600

    Current replacement for later right A2780501600 within the bulletin tensioner branch Fitment/availability: The inspected direct U.S. page identifies genuine 2780504800 and showed it in stock with price and purchase controls; catalog subs…

    FCP Euro

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Owner tips & cautions

  • TipShort oil change intervals (every 7,500 miles with full synthetic) help prevent this issue. The extended 15,000-mile intervals Mercedes recommends are too long for these engines.
Typical repair cost:$2,000 - $5,000

Research This Issue

Based on 450 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence450 owner reportsLast reported by owners Oct 2025Reviewed Mar 2026
Community reported
380 owners

On the 2013-2020 Mercedes-Benz SL-Class, 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 sunlight on the screen exacerbate the issue.

This issue also affects: Mercedes-Benz M-Class, Mercedes-Benz CLA, Mercedes-Benz E-Class

Common Symptoms

  • Screen goes black or freezes
  • System unresponsive to touch or button input
  • Navigation stops updating
  • Audio cuts out
  • Spontaneous reboots

How to Fix

Perform a soft reset by holding the power button. Visit the dealer for the latest COMAND software update. If persistent, the COMAND head unit may need replacement. Ensure the fiber optic MOST bus connections are secure as loose connections cause communication faults.

Owner tips & cautions

  • TipMany COMAND freezes are caused by a failing hard drive. Upgrading to an SSD can resolve the issue permanently and improve system responsiveness.

Research This Issue

Based on 380 owner reports

GoogleRedditYouTubeNHTSA
Community Reported
Medium Confidence380 owner reportsLast reported by owners Sep 2025Reviewed Mar 2026
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Frequently Asked Questions

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

According to Au7o's analysis of 2,330+ owner reports, the 2017 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 2017 Mercedes-Benz SL-Class has 3 known issues documented across 2,330+ owner reports. None of the matching records is rated critical; this is not a complete reliability assessment. 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?

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.

Data sourced from 2,330+ owner reports, NHTSA recalls, TSBs, and automotive forums.

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.