2009 Mercedes-Benz CLS500

The 2009 Mercedes-Benz CLS500 is a luxury four-door coupe that combines sleek styling with a comfortable ride. The CLS500 features a 5.5-liter V8 engine producing 382 horsepower and 391 lb-ft of torque, paired with a 7-speed automatic transmission (7G-TRONIC). Other engine options for the CLS-Class in 2009 included the CLS550 (similar engine, different tuning) and the high-performance CLS63 AMG. Owners generally appreciate the car’s distinctive design, powerful engine, and luxurious interior. However, some common complaints revolve around the high cost of maintenance and repairs, as well as some specific issues with the air suspension and electrical systems.

Engine

5.5L V8 (M273)

• Camshaft Adjuster Solenoid Failure
  • Description/Symptoms: Check Engine Light (CEL) illumination, rough idle, decreased engine performance, engine noise (ticking or rattling). Fault codes related to camshaft position or timing may be present.
  • Solution: Replacement of the faulty camshaft adjuster solenoid(s).
  • Estimated Cost to Fix: $200 - $500+ per solenoid (parts and labor).
  • Recalls: None Found
• Oil Leaks (Valve Cover Gaskets, Oil Filter Housing)
  • Description/Symptoms: Visible oil leaks on the engine, burning oil smell, low oil level.
  • Solution: Replacement of the leaking gasket(s) or housing.
  • Estimated Cost to Fix: $200 - $600+ (depending on the location and severity of the leak).
  • Recalls: None Found

Transmission

7G-TRONIC (722.9)

• Torque Converter Failure
  • Description/Symptoms: Shuddering or vibrations, especially during acceleration, harsh or delayed shifting, slipping.
  • Solution: Torque converter replacement. In some cases, a transmission rebuild may be necessary if contamination has occurred.
  • Estimated Cost to Fix: $1,500 - $4,000+ (depending on the shop and whether a rebuild is needed).
  • Recalls: None Found
• Valve Body Issues
  • Description/Symptoms: Erratic shifting, harsh shifting, delayed engagement, getting stuck in gear, or not shifting at all.
  • Solution: Valve body replacement or rebuild.
  • Estimated Cost to Fix: $800 - $2,000+.
  • Recalls: None Found

Suspension

• Airmatic Suspension Failure
  • Description/Symptoms: Vehicle sagging on one or more corners, suspension warning lights, compressor running constantly, harsh ride.
  • Solution: Replacement of the faulty air spring(s), compressor, valve block, or air lines.
  • Estimated Cost to Fix: $500 - $2,000+ per corner (air spring replacement); $500 - $1,000+ (compressor replacement).
  • Recalls: None Found

Electrical

• EIS (Electronic Ignition Switch) Failure
  • Description/Symptoms: Key not recognized, difficulty starting the car, no electrical power to the car, steering wheel lock malfunction.
  • Solution: Replacement of the EIS module. This often requires programming by a Mercedes-Benz dealer or specialized mechanic.
  • Estimated Cost to Fix: $800 - $1,500+.
  • Recalls: None Found
• SAM (Signal Acquisition Module) Issues
  • Description/Symptoms: Malfunctioning lights, wipers, or other electrical components. Can also cause issues with starting and other electronic systems.
  • Solution: Diagnosis to determine which SAM module is failing (front or rear), followed by replacement and programming.
  • Estimated Cost to Fix: $500 - $1,200+.
  • Recalls: None Found

Exterior

• Sunroof Issues
  • Description/Symptoms: Sunroof not opening or closing properly, unusual noises when operating, leaks.
  • Solution: Repair or replacement of the sunroof mechanism, motor, or seals.
  • Estimated Cost to Fix: $300 - $1,000+.
  • Recalls: None Found

Interior

• No Issues Found

Summary

The 2009 Mercedes-Benz CLS500, while a stylish and powerful vehicle, can be prone to certain issues. The air suspension and electrical systems are common areas of concern, and repairs can be costly. The engine and transmission, while generally reliable, can also experience problems requiring significant investment. Potential buyers should be aware of these potential issues and factor in the cost of maintenance and repairs when considering purchasing this vehicle. While some issues are relatively minor, others can be quite severe and expensive to address, making a pre-purchase inspection by a qualified mechanic highly advisable.