2021 Mercedes-Benz EQC400

The 2021 Mercedes-Benz EQC400 is an all-electric SUV marking Mercedes-Benz’s entry into the electric vehicle market. It features a dual-motor all-wheel-drive system producing 402 horsepower and 561 lb-ft of torque. While praised for its comfortable ride, luxurious interior, and brisk acceleration, some owners have voiced concerns about its range compared to competitors, infotainment system glitches, and certain build quality issues.

Electric Motor

Dual Electric Motor (EQC400)

• Motor Control Unit (MCU) Software Glitches
  • Description/Symptoms: Some owners reported experiencing intermittent software glitches within the MCU that control the electric motors. This can manifest as temporary power loss, delayed throttle response, or error messages on the dashboard.
  • Solution: A software update from Mercedes-Benz, performed by a dealership.
  • Estimated Cost to Fix: Covered under warranty.
  • Recalls: None Found

Battery/Charging System

• Charging Port Door Malfunction
  • Description/Symptoms: Some owners have experienced the electric charging port door failing to open or close properly. This can hinder charging and expose the port to the elements.
  • Solution: Replacement of the charging port door mechanism.
  • Estimated Cost to Fix: $300 - $500+
  • Recalls: None Found
• Onboard Charger Failure
  • Description/Symptoms: The onboard charger fails to properly charge the battery, or charges very slowly. This can be identified by error messages and slow charging times.
  • Solution: Replacement of the onboard charger.
  • Estimated Cost to Fix: $1500 - $2500+
  • Recalls: None Found

Electrical System

• MBUX Infotainment System Freezing/Crashing
  • Description/Symptoms: The Mercedes-Benz User Experience (MBUX) system, responsible for navigation, entertainment, and vehicle controls, experiences freezing, crashing, or lagging.
  • Solution: A software update performed by a dealership, or replacement of the MBUX system’s control unit.
  • Estimated Cost to Fix: Covered under warranty if a software issue, otherwise $1000+ for hardware replacement.
  • Recalls: None Found
• 12V Battery Issues
  • Description/Symptoms: Premature failure of the 12V auxiliary battery can cause various electrical issues, including difficulty starting, infotainment system problems, and error messages.
  • Solution: Replacement of the 12V battery.
  • Estimated Cost to Fix: $200 - $400
  • Recalls: None Found

Exterior

• Sensor Malfunctions (Parking Sensors/Cameras)
  • Description/Symptoms: The parking sensors or rearview camera may intermittently fail or provide inaccurate readings. This can lead to difficulties when parking or maneuvering in tight spaces.
  • Solution: Cleaning the sensors, or replacing faulty sensors/camera modules.
  • Estimated Cost to Fix: $200 - $800+, depending on the sensor.
  • Recalls: None Found

Interior

• Sunroof Rattling/Squeaking
  • Description/Symptoms: Rattling or squeaking noises coming from the sunroof area, especially when driving over uneven surfaces.
  • Solution: Adjusting or lubricating the sunroof mechanism, or replacing worn components.
  • Estimated Cost to Fix: $100 - $500+
  • Recalls: None Found

Summary

The 2021 Mercedes-Benz EQC400, while a luxurious and capable electric SUV, exhibits a few common issues. The most frequent problems seem to revolve around the MBUX infotainment system and various electrical glitches. The other identified issues are less severe and not reported as frequently. Repair costs can range from relatively minor (battery replacements) to more substantial (charging system components). While many issues are covered under warranty, be aware of potential out-of-pocket expenses for certain components or issues arising after the warranty expires.