2012 Mercedes-Benz CLS500

The 2012 Mercedes-Benz CLS500 is a stylish four-door coupe that offers a blend of luxury and performance. This model year features a 4.7-liter twin-turbo V8 engine producing 402 horsepower and 443 lb-ft of torque. Other engine options include the CLS550 with a similar V8 engine but with higher output, and the CLS63 AMG with a more powerful hand-built AMG V8 engine. All engines are paired with a 7-speed automatic transmission. Owners appreciate the CLS500 for its elegant design, comfortable ride, and powerful engine. Common dislikes include higher maintenance costs and some reported electrical issues.

Engine

4.7L Twin-Turbo V8

• Oil Leaks from Valve Cover Gaskets
  • Description/Symptoms: Oil leaking onto the exhaust manifolds, causing a burning smell and potential smoke. Visible oil residue around the valve covers.
  • Solution: Replacing the valve cover gaskets.
  • Estimated Cost to Fix: $400 - $800+
  • Recalls: None Found
• Turbocharger Failure
  • Description/Symptoms: Loss of power, whining noise from the engine bay, check engine light illumination.
  • Solution: Replacing the failed turbocharger(s).
  • Estimated Cost to Fix: $2,000 - $5,000+
  • Recalls: None Found
• Fuel Injector Issues
  • Description/Symptoms: Rough idling, misfires, poor fuel economy, check engine light.
  • Solution: Replacing the faulty fuel injectors.
  • Estimated Cost to Fix: $800 - $1,500+
  • Recalls: None Found

Transmission

7G-Tronic (7-Speed Automatic)

• Torque Converter Issues
  • Description/Symptoms: Shuddering during acceleration, particularly at lower speeds. Transmission slipping.
  • Solution: Replacing the torque converter.
  • Estimated Cost to Fix: $1,500 - $3,000+
  • Recalls: None Found
• Valve Body Problems
  • Description/Symptoms: Harsh or erratic shifting, delayed engagement of gears.
  • Solution: Replacing or rebuilding the valve body.
  • Estimated Cost to Fix: $1,200 - $2,500+
  • Recalls: None Found

Suspension

• Airmatic Suspension Failure
  • Description/Symptoms: Vehicle sitting low on one or more corners, ride height not adjusting properly, “Visit Workshop” message on the dash.
  • Solution: Replacing the failed air struts, air compressor, or associated components.
  • Estimated Cost to Fix: $1,000 - $3,000+ per strut
  • Recalls: None Found

Electrical

• EIS (Electronic Ignition Switch) Failure
  • Description/Symptoms: Key not recognized, inability to start the vehicle, intermittent starting problems.
  • Solution: Replacing the EIS unit and potentially reprogramming keys.
  • Estimated Cost to Fix: $800 - $1,500+
  • Recalls: None Found
• Battery Drain Issues
  • Description/Symptoms: Battery draining overnight or within a few days of non-use.
  • Solution: Diagnosing and repairing the source of the parasitic draw. This could be a faulty module, relay, or wiring issue.
  • Estimated Cost to Fix: $100 - $500+ depending on the source of the draw
  • Recalls: None Found
• SAM (Signal Acquisition Module) Failure
  • Description/Symptoms: Malfunction of various electrical components, such as lights, wipers, or door locks. Diagnostic trouble codes related to communication errors.
  • Solution: Replacing the faulty SAM unit and reprogramming it.
  • Estimated Cost to Fix: $800 - $1,800+
  • Recalls: None Found

Exterior

• Headlight Condensation
  • Description/Symptoms: Moisture buildup inside the headlight housing.
  • Solution: Replacing the headlight unit or attempting to reseal it (success may vary).
  • Estimated Cost to Fix: $500-$2000+ per headlight to replace depending on if aftermarket or OEM
  • Recalls: None Found

Interior

• Sunroof Issues
  • Description/Symptoms: Sunroof not opening or closing properly, getting stuck, making excessive noise.
  • Solution: Repairing or replacing the sunroof motor, tracks, or cables.
  • Estimated Cost to Fix: $300 - $1,200+
  • Recalls: None Found

Summary

The 2012 Mercedes-Benz CLS500 offers a luxurious driving experience but can be prone to certain issues. The most significant concerns revolve around the engine, transmission, suspension, and electrical systems. Repairs can be costly, particularly those related to the Airmatic suspension, turbochargers, and electronic modules. Prospective buyers should have a pre-purchase inspection performed by a qualified mechanic familiar with Mercedes-Benz vehicles to identify any potential problems.