2012 Mercedes-Benz SL500

The 2012 Mercedes-Benz SL500 is a luxurious roadster boasting a 4.7L twin-turbo V8 engine producing 429 horsepower and 516 lb-ft of torque. Other engine options included the SL550 and SL63 AMG. This SL500 offers a blend of performance and comfort. Owners often praise its retractable hardtop, powerful engine, and opulent interior. Some common complaints include the high cost of maintenance, complex electronics that can be prone to failure, and the sometimes-harsh ride quality despite its luxury status.

Engine

4.7L Twin-Turbo V8 (M278)

• Oil Leaks
  • Description/Symptoms: Oil leaks may develop from the valve cover gaskets, oil filter housing, or rear main seal. Signs include visible oil leaks on the engine, oil puddles under the car, and a burning oil smell.
  • Solution: Replace the faulty gaskets or seals. Thoroughly clean the affected area to ensure proper sealing.
  • Estimated Cost to Fix: $200 - $1500+ depending on the source and severity of the leak
• Camshaft Adjuster Solenoid Failure
  • Description/Symptoms: Engine may run rough, misfire, or have reduced power. Diagnostic trouble codes (DTCs) related to camshaft position may be present.
  • Solution: Replace the faulty camshaft adjuster solenoid.
  • Estimated Cost to Fix: $300 - $800+

Transmission

7G-Tronic (722.9)

• Valve Body Issues
  • Description/Symptoms: Harsh or delayed shifting, transmission slipping, or failure to shift properly. Diagnostic trouble codes related to valve body faults may be present.
  • Solution: Replace or rebuild the valve body. In some cases, flushing the transmission and replacing the conductor plate may resolve the issue.
  • Estimated Cost to Fix: $800 - $3000+
• Torque Converter Failure
  • Description/Symptoms: Shuddering or vibration at low speeds, especially during acceleration. Transmission may also slip or fail to engage properly.
  • Solution: Replace the torque converter.
  • Estimated Cost to Fix: $1500 - $4000+

Suspension

• ABC (Active Body Control) System Leaks/Failure
  • Description/Symptoms: The ABC system can develop leaks in the hydraulic lines, struts, or pump. This can lead to a loss of ride height, uneven suspension, and warning messages on the dashboard.
  • Solution: Replace the leaking components (lines, struts, or pump). A complete system flush and refill may also be necessary.
  • Estimated Cost to Fix: $500 - $3000+ per component
• ABC Strut Failure
  • Description/Symptoms: Leaking strut, sagging of one corner of the vehicle.
  • Solution: Replace the failing strut
  • Estimated Cost to Fix: $1500 - $3000+

Electrical

• Battery Drain Issues
  • Description/Symptoms: The battery drains quickly, especially when the car is not in use. This can lead to difficulty starting the car or complete battery failure.
  • Solution: Identify and repair the source of the parasitic drain. This may involve troubleshooting various electrical components, such as the infotainment system, door modules, or alarm system.
  • Estimated Cost to Fix: $100 - $1000+ depending on the source of the drain.
• Retractable Hardtop Malfunctions
  • Description/Symptoms: The retractable hardtop may fail to open or close properly. This can be caused by issues with the hydraulic pump, sensors, or control module.
  • Solution: Diagnose and repair the specific component causing the malfunction. This may involve replacing the hydraulic pump, sensors, or control module.
  • Estimated Cost to Fix: $500 - $3000+ depending on the component and repair needed.
• COMAND System Problems
  • Description/Symptoms: The COMAND system (Mercedes’ infotainment system) can experience various issues such as freezing, crashing, or failing to respond to inputs.
  • Solution: In some cases, a software update can resolve the issue. However, more severe problems may require replacing the COMAND unit.
  • Estimated Cost to Fix: $100 - $200 (software update) to $1000+ (replacement)

Exterior

• Retractable Hardtop Seal Leaks
  • Description/Symptoms: Water leaks into the cabin, especially during rain or car washes.
  • Solution: Replace the worn or damaged seals around the retractable hardtop.
  • Estimated Cost to Fix: $200 - $1000+

Interior

• Seat Motor Failure
  • Description/Symptoms: Seat does not move in one or more directions
  • Solution: Replace the faulty motor
  • Estimated Cost to Fix: $300 - $800+

Recalls Recalls: 2012070001, 2014070002, 2015060003, 21V277000, 21V647000, 22V344000

The 2012 Mercedes-Benz SL500 offers a luxurious driving experience but can be prone to various issues, particularly with its complex systems. The Active Body Control (ABC) suspension, electrical systems, and retractable hardtop are known for potential problems that can lead to costly repairs. Engine and transmission issues, while less frequent, can also be expensive to address. Potential buyers should carefully inspect these areas and budget for potential maintenance and repairs.