2014 Mercedes-Benz ML500

The 2014 Mercedes-Benz ML500 is a mid-size luxury SUV known for its comfortable ride, powerful engine, and luxurious interior. The ML500 is equipped with a 4.7L Twin-Turbo V8 engine, producing 402 horsepower and 443 lb-ft of torque. Other engine options for the 2014 M-Class include a 3.5L V6 (ML350), a 2.1L Diesel Inline-4 (ML250 Bluetec), and a 3.0L Diesel V6 (ML350 Bluetec). All engines are paired with a 7G-TRONIC PLUS 7-speed automatic transmission. Owners often praise the ML500 for its smooth acceleration, opulent interior, and overall driving experience. Common criticisms include the high cost of maintenance and repairs, and some find the infotainment system dated.

Engine

4.7L Twin-Turbo V8 (M278)

• Oil Leaks
  • Description/Symptoms: Oil leaks are common, particularly from the valve cover gaskets, oil filter housing, and timing chain cover. Symptoms include visible oil drips under the vehicle, the smell of burning oil, and low oil levels.
  • Solution: Replace the leaking gaskets or seals. Thoroughly clean the affected area after the repair.
  • Estimated Cost to Fix: $200 - $1500+ depending on the location and severity of the leak.
• Turbocharger Issues
  • Description/Symptoms: The turbos can experience failures, leading to reduced power, whistling noises, and potentially check engine lights. Can be caused by oil starvation or general wear and tear.
  • Solution: Replace the faulty turbocharger(s). Ensure proper oil supply to the new turbo(s).
  • Estimated Cost to Fix: $2,500 - $5,000+ for parts and labor, depending on whether one or both turbos need replacement.

Transmission

7G-TRONIC PLUS 7-Speed Automatic (722.9)

• Valve Body Issues
  • Description/Symptoms: Problems with the valve body can lead to harsh shifting, delayed engagement, and slipping between gears. This is a common issue with the 722.9 transmission.
  • Solution: Replacing the valve body, often including the conductor plate. Sometimes, a software update can help, but physical replacement is often necessary.
  • Estimated Cost to Fix: $1,500 - $3,000+ depending on the shop and whether a new or rebuilt valve body is used.
• Torque Converter Failure
  • Description/Symptoms: Shuddering during acceleration, particularly at lower speeds. May also cause unusual noises.
  • Solution: Replacing the torque converter. Inspect the transmission for any debris from the failed torque converter and flush the system thoroughly.
  • Estimated Cost to Fix: $1,800 - $3,500+

Suspension

• Airmatic Suspension Failure
  • Description/Symptoms: The Airmatic suspension (if equipped) can develop leaks in the air struts, leading to a sagging vehicle height, particularly overnight. The air compressor can also fail due to overwork. Warning lights on the dash may illuminate.
  • Solution: Replace the faulty air strut(s) or air compressor. Address any leaks in the air lines.
  • Estimated Cost to Fix: $1,000 - $2,500+ per strut, $800 - $1,500+ for the compressor, depending on the brand and shop.

Electrical

• Battery Drain Issues
  • Description/Symptoms: Premature battery drain, especially if the vehicle sits for extended periods. This can be due to a parasitic draw from various electrical components.
  • Solution: Diagnose and repair the source of the parasitic draw. This often requires a specialized electrical diagnostic procedure.
  • Estimated Cost to Fix: $150 - $500+ depending on the complexity of the issue.
• COMAND System Malfunctions
  • Description/Symptoms: The COMAND infotainment system can experience various glitches, including freezing, screen blackouts, and navigation errors.
  • Solution: Software update, or replacement of the COMAND unit.
  • Estimated Cost to Fix: $100-$500 for software, $800 - $2,000+ for unit replacement.

Exterior

• Sunroof Issues
  • Description/Symptoms: Sunroofs may become stuck, fail to open or close properly, or leak water.
  • Solution: Repair or replace the sunroof motor, tracks, or seals. Clearing drain passages is critical.
  • Estimated Cost to Fix: $200 - $1,500+ depending on the nature of the problem.

Interior

• Seat Motor Failure
  • Description/Symptoms: Power seats may stop working, or only move in certain directions. This is often due to a faulty seat motor or switch.
  • Solution: Replace the faulty seat motor or switch.
  • Estimated Cost to Fix: $200 - $800+

Recalls:

• 2014050003
• 2014070004
• 2015070006
• 2016080002
• 2017030006
• 2019040007
• 21V987000

Summary:

The 2014 Mercedes-Benz ML500 offers a luxurious driving experience, but potential buyers should be aware of common issues. Engine oil leaks and turbocharger problems with the V8 engine can lead to significant repair costs. Transmission issues, particularly with the valve body, are also a concern. The Airmatic suspension (if equipped) can be expensive to maintain. Electrical gremlins, such as battery drain and COMAND system malfunctions, may also arise. Overall, the ML500 can be a rewarding vehicle to own, but prospective buyers should factor in potential repair costs and maintenance needs.