2009 Mercedes-Benz CLS500

2009 Mercedes-Benz CLS500

Overview

The 2009 Mercedes-Benz CLS500, part of the C219 generation, is a luxury grand tourer known for its distinctive styling and powerful performance. Powered by a robust 5.0L V8 engine, it offers a refined driving experience. While generally well-regarded for its build quality and comfort, like any vehicle of its age and complexity, it can experience specific issues. This analysis focuses on documented reliability concerns beyond routine maintenance, providing insights into potential problem areas for owners and prospective buyers. The CLS500 aims to blend sporty aesthetics with Mercedes-Benz’s signature luxury and engineering prowess.

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Engine

5.0L V8 (M113)

Oil Cooler Seals Leak

• Symptoms: Oil in coolant reservoir, coolant in oil, overheating.
• Solution: Replacement of oil cooler seals.
• Cost: $300 - $600

Intake Manifold Gasket Leak

• Symptoms: Vacuum leaks, rough idle, check engine light.
• Solution: Replacement of intake manifold gaskets.
• Cost: $400 - $800

Transmission

5-Speed Automatic (722.6)

Transmission Control Module (TCM) Failure

• Symptoms: Erratic shifting, limp mode, failure to engage gears.
• Solution: Replacement of the TCM.
• Cost: $800 - $1500

Conductor Plate Issues

• Symptoms: Harsh shifting, delayed engagement, transmission warning light.
• Solution: Replacement of the conductor plate.
• Cost: $500 - $1000

Suspension

AirMatic Suspension

Air Strut Leaks

• Symptoms: Vehicle sagging on one or more corners, uneven ride height, compressor running excessively.
• Solution: Replacement of leaking air struts or seals.
• Cost: $700 - $1500 per strut

Air Compressor Failure

• Symptoms: Inability to raise or lower the vehicle, constant compressor running, warning lights.
• Solution: Replacement of the air compressor.
• Cost: $600 - $1200

Electrical

Body Control Module (BCM)

BCM Malfunctions

• Symptoms: Intermittent issues with lights, windows, locks, or other accessories; warning lights.
• Solution: Diagnosis and potential reprogramming or replacement of the BCM.
• Cost: $700 - $1500

Headlight Ballast Failure

Xenon Headlight Malfunction

• Symptoms: One or both headlights not turning on, flickering headlights.
• Solution: Replacement of the headlight ballast.
• Cost: $300 - $600 per ballast

Exterior

Standard Chassis

No Major Issues

• Symptoms: No widespread issues reported.
• Solution: No widespread issues reported.
• Cost: N/A

Interior

Standard Interior

No Major Issues

• Symptoms: No widespread issues reported.
• Solution: No widespread issues reported.
• Cost: N/A

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Summary Verdict

The 2009 Mercedes-Benz CLS500 offers a compelling blend of luxury and performance, but potential owners should be aware of specific reliability concerns. The 5.0L V8 engine, while generally robust, can develop leaks from oil cooler seals or intake manifold gaskets. The 5-speed automatic transmission, particularly the 722.6 variant, may experience issues with its control module or conductor plate, leading to shifting problems. The optional AirMatic suspension is a notable area for potential expense, with common failures including air strut leaks and compressor issues. Electrical gremlins, such as BCM malfunctions and headlight ballast failures, can also arise. While the exterior and interior are generally well-built, these specific components represent the most common areas requiring attention on this model.