2021 Mercedes-Benz GLA45 AMG

The 2021 Mercedes-Benz GLA45 AMG is a high-performance subcompact SUV. It’s praised for its potent engine, agile handling, and luxurious interior. However, some owners have reported experiencing certain issues. The GLA45 AMG comes standard with a turbocharged 2.0-liter four-cylinder engine producing 382 horsepower and 350 lb-ft of torque, paired with an 8-speed automatic transmission. What owners often dislike is the firm ride, especially on rough roads, and the relatively high price tag for a subcompact SUV.

Engine

2.0L Turbocharged Inline-4 (M139)

• Excessive Oil Consumption
  • Description/Symptoms: Some owners have reported higher than expected oil consumption between oil changes. The exact cause can vary but sometimes it’s related to piston ring issues.
  • Solution: The solution varies based on the cause of the oil consumption. A compression test can help determine if the piston rings are the source of the problem. If the rings are defective, they will need to be replaced.
  • Estimated Cost to Fix: $3,000 - $6,000+
  • Recalls: None Found
• Coolant Leak
  • Description/Symptoms: Some owners have noted coolant leaks. The exact location can vary, but the turbocharger coolant lines or the water pump are potential sources.
  • Solution: Identify and replace the leaking component.
  • Estimated Cost to Fix: $200 - $1,000+ depending on the component and labor.
  • Recalls: None Found

Transmission

8-Speed Automatic (AMG Speedshift DCT 8G)

• Harsh or Delayed Shifting
  • Description/Symptoms: Some owners have experienced harsh or delayed shifting, particularly at lower speeds. This can sometimes be attributed to the transmission control module (TCM) software or the mechatronics unit.
  • Solution: A software update to the TCM may resolve the issue. In other cases, the mechatronics unit may need to be replaced.
  • Estimated Cost to Fix: $200 (software update) - $3,000+ (mechatronics unit)
  • Recalls: None Found
• Transmission Slipping
  • Description/Symptoms: Transmission Slipping can occur as the vehicle reaches higher mileage. The vehicle will rev high as if the transmission is in neutral before engaging into gear.
  • Solution: Replacement of the transmission
  • Estimated Cost to Fix: $7,000+
  • Recalls: None Found

Suspension

• No Issues Found

Electrical

• Malfunctioning MBUX System
  • Description/Symptoms: The Mercedes-Benz User Experience (MBUX) system can sometimes exhibit glitches, freezing, or unresponsiveness. This includes issues with the touchscreen display, voice control, and navigation.
  • Solution: A software update is often the first step. If the problem persists, a hardware replacement of the head unit may be required.
  • Estimated Cost to Fix: $0 (software update) - $1,500+ (head unit replacement)
  • Recalls: None Found
• Sensor Failures
  • Description/Symptoms: Various sensors, such as those for the parking assist or lane-keeping assist, can fail or provide inaccurate readings.
  • Solution: Diagnose the faulty sensor and replace it.
  • Estimated Cost to Fix: $200 - $800+ per sensor, depending on the sensor’s location and complexity.
  • Recalls: None Found

Exterior

• No Issues Found

Interior

• Rattling or Squeaking Noises
  • Description/Symptoms: Some owners have reported rattling or squeaking noises emanating from the dashboard, door panels, or rear cargo area.
  • Solution: Identifying the source of the noise and applying sound-deadening material or tightening loose panels.
  • Estimated Cost to Fix: $100 - $500+ depending on the complexity of the repair.
  • Recalls: None Found

Summary

The 2021 Mercedes-Benz GLA45 AMG, while offering exhilarating performance, can be susceptible to certain issues. Engine issues, such as excessive oil consumption and coolant leaks, can be costly to repair. The transmission can also experience shifting problems that can be rectified with a software update or component replacement. Electrical issues, especially with the MBUX system, are also common. Interior rattles are reported as well. Overall, while these issues can be frustrating, addressing them promptly can help maintain the vehicle’s performance and reliability. Owners should budget for potential repairs, particularly as the vehicle ages and accumulates mileage.