2019 Mercedes-Benz GLE450

The 2019 Mercedes-Benz GLE450 represents a significant step forward in the GLE lineup, offering a blend of luxury, performance, and technology. This model year marked the introduction of the redesigned GLE-Class. While the GLE450 was equipped with a 3.0L inline-6 turbocharged engine producing 362 horsepower and 369 lb-ft of torque, paired with a 9G-TRONIC 9-speed automatic transmission, the GLE also came in other trims. The GLE350 was equipped with a 2.0L inline-4 turbocharged engine producing 255 horsepower and 273 lb-ft of torque, paired with the 9G-TRONIC 9-speed automatic transmission. At the high end was the AMG GLE 63 S with a 4.0L V8 Biturbo engine producing 603 horsepower and 627 lb-ft of torque, paired with an AMG SPEEDSHIFT TCT 9-speed automatic transmission. Owners often praise the GLE450 for its smooth ride, powerful engine, and advanced technology features. Some common criticisms include the complex infotainment system and occasional electronic glitches.

Engine

3.0L Inline-6 Turbocharged (M256)

• Rough Idle/Misfires
  • Description/Symptoms: Some owners have reported a rough idle, hesitation upon acceleration, or engine misfires. These issues can be intermittent.
  • Solution: Diagnosis involves checking for fault codes, inspecting spark plugs and ignition coils. The M256 engine includes an electric auxiliary compressor that can also cause issues.
  • Estimated Cost to Fix: $100 - $500+ depending on the cause.
  • Recalls: None Found
• Failure of 48V Mild Hybrid System
  • Description/Symptoms: Some owners have reported failures with the 48V mild hybrid system, leading to error messages, reduced performance, or complete engine shutdown. The integrated starter generator (ISG) is often implicated.
  • Solution: Replacing the ISG unit and related components, after a thorough diagnosis of the 48V system.
  • Estimated Cost to Fix: $2,000 - $5,000+
  • Recalls: None Found

Transmission

9G-TRONIC 9-Speed Automatic (725.0 or 725.1)

• Harsh Shifting/Hesitation
  • Description/Symptoms: Some owners have noted harsh or jerky shifting, particularly between lower gears. There may be a noticeable hesitation when accelerating from a stop.
  • Solution: Software updates to the transmission control module (TCM) can sometimes resolve these issues. In more severe cases, valve body replacement may be necessary.
  • Estimated Cost to Fix: $200 (software update) - $2,000+ (valve body replacement)
  • Recalls: None Found

Suspension

• AIRMATIC Suspension Issues
  • Description/Symptoms: The AIRMATIC air suspension system can experience leaks, leading to sagging of the vehicle, particularly overnight. Fault codes related to the air suspension system may be present.
  • Solution: Identify and replace leaking air struts or air lines. In some cases, the air compressor may need to be replaced.
  • Estimated Cost to Fix: $800 - $2,000+ per strut, $500 - $1,000+ for compressor replacement.
  • Recalls: None Found

Electrical

• MBUX Infotainment System Problems
  • Description/Symptoms: Freezing, lagging, or complete system failure of the MBUX infotainment system are common complaints. Features like navigation, media playback, and voice control may be affected.
  • Solution: Software updates are the first step. In some cases, replacement of the MBUX head unit may be required.
  • Estimated Cost to Fix: $0 (software update) - $1,500+ (head unit replacement)
  • Recalls: None Found
• Sensor Failures
  • Description/Symptoms: Failure of the parking sensors or other driver assistance system sensors.
  • Solution: The sensor can be replaced if there is a fault.
  • Estimated Cost to Fix: $200-$500 per sensor.
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Creaking/Rattling Sounds
  • Description/Symptoms: Some owners report creaking or rattling noises emanating from the dashboard, door panels, or rear cargo area.
  • Solution: Locating and isolating the source of the noise, then applying felt tape or foam to dampen the vibrations.
  • Estimated Cost to Fix: This is often a DIY fix or can be addressed by a technician for $100 - $500+, depending on the complexity.
  • Recalls: None Found

Summary

The 2019 Mercedes-Benz GLE450 is generally a reliable vehicle, but some owners have experienced issues, particularly with the 48V mild hybrid system, AIRMATIC suspension, and MBUX infotainment system. Engine and transmission problems, while less common, can also occur. Repair costs can range from a few hundred dollars for minor fixes to several thousand for major component replacements. Potential buyers should be aware of these potential issues and thoroughly inspect the vehicle before purchase.