Top 5 Problems With the 2024 Mercedes-Benz EQS-Class Sedan

A critical software error in the battery management system (BMS) can cause the high-voltage battery to incorrectly detect a fault, leading to its deactivation. This issue is severe as it results in a complete loss of drive power while the vehicle is in motion, significantly increasing the risk of a crash. Multiple NHTSA recalls (24V-086, 24V-089, 24V-090) have been issued to address this problem.

Symptoms drivers notice

• Sudden and complete loss of propulsion while driving
• Vehicle enters a 'limp home' mode or shuts down entirely
• Warning messages displayed on the instrument cluster, such as 'High-Voltage Battery Malfunction'
• Inability to restart the vehicle after it has shut down due to the fault
• Reduced power output before complete deactivation

Typical repair cost and time

Typically covered under manufacturer's warranty. Out-of-warranty cost for battery management system diagnostics and potential module replacement could range from $1,500 - $5,000+ for parts and 2-5 hours of labor.

How to diagnose and fix

1. Immediately pull over to a safe location if loss of power occurs.
2. Contact Mercedes-Benz roadside assistance for towing to a certified dealership.
3. Dealership technicians will connect to the vehicle's diagnostic system to read fault codes from the BMS.
4. Verify if the vehicle is subject to any active high-voltage battery deactivation recalls.
5. Perform a software update for the battery management system (BMS) and potentially other related control units as per Mercedes-Benz service bulletin.
6. Test drive the vehicle to confirm the issue is resolved and no further error codes are present.

The advanced MBUX infotainment system, while feature-rich, can experience software glitches leading to various operational issues, including the critical failure of the rear camera display. A specific NHTSA recall (24V-088) addresses a software error that prevents the rear camera image from displaying, which is a safety hazard as it impairs the driver's rear visibility during reversing maneuvers. Other common MBUX issues include freezing or unresponsiveness.

Symptoms drivers notice

• Rearview camera image not displaying when shifting into reverse
• Infotainment screen freezing or becoming unresponsive
• Slow response times when interacting with the MBUX system
• Navigation system errors or incorrect route guidance
• Intermittent loss of audio or connectivity features (Bluetooth, Apple CarPlay/Android Auto)
• System requiring frequent reboots or resets to function correctly

Typical repair cost and time

Typically covered under manufacturer's warranty. Out-of-warranty cost for software diagnostics and updates is generally $200 - $400 for 1-2 hours of labor. If a hardware module replacement is needed, costs could exceed $1,000.

How to diagnose and fix

1. Attempt a soft reset of the MBUX system (refer to owner's manual for procedure).
2. Check for any available over-the-air (OTA) software updates for the MBUX system.
3. Schedule an appointment with a Mercedes-Benz dealership for diagnostic scanning.
4. Technicians will check for specific fault codes related to the MBUX and camera systems.
5. Apply the latest software update to the MBUX control unit, specifically addressing the rear camera recall (24V-088) if applicable.
6. Verify proper functionality of the infotainment system and rear camera after the update.

A software error within the occupant detection system can prevent the front passenger seat belt reminder from activating when a passenger is unbuckled. This issue, identified by NHTSA recall 24V-087, is a safety compliance concern, as it fails to alert the occupant to fasten their seat belt, potentially increasing the risk of injury in a collision.

Symptoms drivers notice

• No audible chime or visual warning light when the front passenger is unbuckled
• Seat belt reminder light on the dashboard remains off despite an unbuckled passenger
• Passenger airbag status indicator may show incorrect information
• No warning when a heavy object is placed on the passenger seat without a seatbelt engaged

Typical repair cost and time

Typically covered under manufacturer's warranty. Out-of-warranty cost for software diagnostics and update is generally $150 - $300 for 1-2 hours of labor.

How to diagnose and fix

1. Confirm the issue by having a passenger sit in the front seat and unbuckle their seat belt.
2. Schedule a service appointment at a Mercedes-Benz dealership.
3. Dealership technicians will connect to the vehicle's diagnostic system to identify the software error.
4. Perform a software update on the occupant detection system control unit as specified by the recall (24V-087).
5. Test the seat belt reminder system with an occupant to ensure proper activation of the chime and warning light.
6. Verify that no related fault codes remain in the system.

The 2024 EQS-Class Sedan is equipped with a comprehensive suite of ADAS features, including adaptive cruise control, lane-keeping assist, and parking assist. Due to the complexity of these systems and their reliance on numerous sensors and intricate software, owners may experience intermittent anomalies such as unexpected braking, erratic steering interventions, or sensor errors that temporarily disable features.

Symptoms drivers notice

• Adaptive cruise control braking unexpectedly or disengaging without warning
• Lane-keeping assist providing jerky or inconsistent steering corrections
• Blind-spot monitoring system giving false alerts or failing to detect vehicles
• Parking assist features (e.g., automatic parking) malfunctioning or failing to initiate
• Warning messages on the dashboard indicating ADAS system limitations or faults
• Sensors (radar, camera, ultrasonic) appearing to be temporarily offline or blocked

Typical repair cost and time

Typically covered under manufacturer's warranty. Out-of-warranty cost for diagnostics and software recalibration/updates could be $300 - $800 for 2-4 hours of labor. If a sensor replacement is needed, costs could range from $500 - $1,500+ per sensor.

How to diagnose and fix

1. Note specific conditions (speed, weather, road type) when ADAS anomalies occur.
2. Ensure all external sensors (radar, cameras) are clean and free from obstructions.
3. Schedule a diagnostic appointment at a Mercedes-Benz dealership.
4. Technicians will perform a comprehensive scan of all ADAS control units for fault codes.
5. Check for and apply any available software updates or recalibrations for the ADAS systems.
6. Perform a road test with diagnostic equipment to monitor sensor inputs and system behavior.
7. If necessary, recalibrate individual sensors (e.g., radar, front camera) using specialized tools.

As a new electric vehicle, the 2024 EQS-Class Sedan can sometimes exhibit software-related inconsistencies with its charging system. While the hardware is generally robust, the complex communication protocols between the vehicle and various public or home charging stations can lead to issues such as slower-than-expected charging rates, premature termination of charging sessions, or 'charging fault' messages, even when the charger itself appears functional.

Symptoms drivers notice

• Charging sessions ending unexpectedly before the battery is full
• Slower charging speeds than advertised or expected from a specific charger
• Vehicle displaying 'Charging Fault' or similar error messages during charging
• Inability to initiate charging at certain public charging stations
• Charging port light indicating an error without a clear cause
• Inconsistent charging behavior across different charging infrastructure types

Typical repair cost and time

Typically covered under manufacturer's warranty. Out-of-warranty cost for diagnostics and software updates related to the charging control unit could be $200 - $500 for 1-3 hours of labor. Hardware replacement (e.g., onboard charger) would be significantly higher, potentially $2,000 - $5,000+.

How to diagnose and fix

1. Attempt to charge at different charging stations (both AC and DC fast chargers) to isolate the issue.
2. Ensure the charging cable is fully seated and locked into both the vehicle and the charging station.
3. Check the vehicle's charging settings in the MBUX system for any limits or schedules.
4. Schedule a diagnostic appointment at a Mercedes-Benz dealership.
5. Technicians will scan the vehicle's charging control unit for fault codes and analyze charging logs.
6. Apply any available software updates for the charging management system or related ECUs.
7. If software updates do not resolve the issue, further hardware diagnostics of the onboard charger or battery management system may be required.

Which problem to fix first

The most critical issue to address first is any problem related to the high-voltage battery deactivation, as this can lead to a sudden loss of drive power, posing a significant safety risk. Owners should immediately check if their vehicle is subject to the relevant NHTSA recalls and schedule service with a Mercedes-Benz dealership. Following this, any safety-related malfunctions like the seat belt reminder or rear camera display issues should be prioritized due to their direct impact on occupant and road safety. For specific vehicle information, visit the Model repair hub.

When to see a professional

Given the highly complex, software-driven nature of the 2024 EQS-Class Sedan, any diagnostic or repair work beyond basic user resets should be handled by a certified Mercedes-Benz technician. Most of the identified issues are software-based recalls or require specialized diagnostic tools and programming. Attempting DIY repairs on high-voltage systems or critical safety components can be dangerous and may void your warranty.

Frequently asked questions

### Are these issues covered by warranty?

Yes, for a 2024 model year vehicle, all identified issues, especially those subject to official recalls, are typically covered under the manufacturer's new vehicle limited warranty. Owners should contact their dealership for specific warranty terms and service scheduling.

### Can software updates fix these problems?

Many of the problems affecting the 2024 EQS-Class Sedan, particularly those related to the high-voltage battery, MBUX system, and safety features, are software-driven. Mercedes-Benz addresses these through over-the-air (OTA) updates or dealer-performed software reprogramming.

### How can I check for recalls on my EQS-Class Sedan?

You can check for active recalls by visiting the NHTSA website and entering your vehicle's VIN, or by contacting your local Mercedes-Benz dealership. It's crucial to address any open recalls promptly to ensure your vehicle's safety and performance. You can also explore general vehicle information at the Vehicle make hub.

Sources and further reading

Owner forums, NHTSA complaints, and OEM TSB summaries informed this guide.

This guide is not a substitute for OEM service procedures; use a qualified technician for safety-critical work.