2009 Mercedes-Benz C63 AMG

The 2009 Mercedes-Benz C63 AMG is a performance sedan known for its powerful naturally aspirated 6.2-liter V8 engine. This engine produces 451 horsepower and 443 lb-ft of torque. A 7-speed automatic transmission sends power to the rear wheels. While praised for its exhilarating performance and aggressive styling, the C63 AMG is also known for some reliability issues and high running costs. Owners often complain about fuel consumption and the potential for costly repairs. There were no other engine or transmission options available for this vehicle other than the 6.2L V8 and 7-Speed Automatic transmission.

Engine

6.2L M156 V8

• Camshaft Adjuster Bolts Failure
  • Description/Symptoms: Early M156 engines (primarily those manufactured before 2011) are prone to camshaft adjuster bolt failure. The original bolts were made from a weaker material and can shear off. Symptoms include a check engine light, rough running, and potential engine damage if the bolts enter the engine.
  • Solution: Replace the camshaft adjuster bolts with the updated, stronger version. It is often recommended to replace all of the bolts on both camshafts as a preventative measure.
  • Estimated Cost to Fix: $2,000 - $4,000+ depending on damage.
  • Recalls: None Found
• Head Bolt Failure
  • Description/Symptoms: Similar to the camshaft adjuster bolts, early M156 engines (primarily those manufactured before 2011) can experience head bolt failure. The original bolts were prone to corrosion and stretching, leading to coolant leaks and potential head gasket failure.
  • Solution: Replace the head bolts with the updated, stronger version. This repair typically involves removing the cylinder heads, which is a labor-intensive process.
  • Estimated Cost to Fix: $4,000 - $8,000+
  • Recalls: None Found
• Oil Leaks
  • Description/Symptoms: The M156 engine can develop oil leaks from various locations, including the valve cover gaskets, oil filter housing, and rear main seal.
  • Solution: Replace the leaking gaskets and seals. The severity of the repair will depend on the location and extent of the leak.
  • Estimated Cost to Fix: $200 - $1,500+ depending on the location of the leak
  • Recalls: None Found
• Lifter Tick
  • Description/Symptoms: Lifter tick can occur on the M156 engine as it ages, especially at cold start. This is often due to the hydraulic lifters bleeding down.
  • Solution: In some cases, using a thicker oil or an oil additive can help reduce lifter tick. In more severe cases, the lifters may need to be replaced.
  • Estimated Cost to Fix: $500 - $3,000+ depending on the extent of the issue

Transmission

7G-Tronic (722.9) 7-Speed Automatic

• Valve Body Issues
  • Description/Symptoms: The 7G-Tronic transmission can experience valve body issues, leading to rough shifting, delayed engagement, and even complete transmission failure.
  • Solution: Replacing or rebuilding the valve body is the most common solution.
  • Estimated Cost to Fix: $1,500 - $3,500+
  • Recalls: None Found
• Conductor Plate Failure
  • Description/Symptoms: The conductor plate, which houses the transmission control unit (TCU), can fail. This can result in erratic shifting, limp mode, and difficulty selecting gears.
  • Solution: Replacing the conductor plate is the standard repair. This often requires reprogramming the TCU.
  • Estimated Cost to Fix: $800 - $2,000+
  • Recalls: None Found

Suspension

• Air Suspension Issues (If Equipped)
  • Description/Symptoms: If equipped with air suspension, the air struts can leak, leading to a sagging ride height and a malfunctioning air compressor.
  • Solution: Replace the leaking air struts and/or the air compressor.
  • Estimated Cost to Fix: $1,000 - $3,000+ per strut
  • Recalls: None Found
• Control Arm Bushing Wear
  • Description/Symptoms: The control arm bushings can wear out, leading to a clunking noise, especially over bumps, and loose handling.
  • Solution: Replace the worn control arm bushings or the entire control arm.
  • Estimated Cost to Fix: $300 - $1,000+ per control arm

Electrical

• EIS (Electronic Ignition Switch) Failure
  • Description/Symptoms: The EIS can fail, preventing the car from starting or unlocking the steering wheel.
  • Solution: Replacing the EIS is required. This often involves reprogramming.
  • Estimated Cost to Fix: $800 - $2,000+
  • Recalls: None Found
• SAM (Signal Acquisition Module) Failure
  • Description/Symptoms: The SAM controls various electrical functions. Failure can lead to issues with lights, wipers, and other electronic components.
  • Solution: Replacing the faulty SAM is the solution. It needs to be programmed to the vehicle.
  • Estimated Cost to Fix: $500 - $1,500+
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• No Issues Found

Summary The 2009 Mercedes-Benz C63 AMG is a high-performance vehicle with a powerful engine and luxurious features. However, potential buyers should be aware of some common issues, particularly with the M156 engine. Head bolt and camshaft adjuster bolt failures can be costly to repair. Transmission issues, such as valve body problems, are also common. While the car offers an exhilarating driving experience, maintenance and repair costs can be high. Buyers should inspect the vehicle thoroughly and consider a pre-purchase inspection by a qualified mechanic specializing in Mercedes-Benz vehicles.