Fitment notes: Auxiliary 12V battery; electric vehicle with high-performance electronics requiring AGM; located in front compartment
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Every control module on the 2023-2026 Mercedes-Benz EQS SUV — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Battery Management System / High Voltage Control Unit (BMS/HVCU)8.5 hr R&Rsecurity gateway +1.5 hr▸ programming details
📍 Under rear cargo floor, integrated with high-voltage battery pack
🔧 Xentry Diagnostics + Vediamo/Monaco with MBD account
⚠️ Requires high-voltage safety lockout, battery pack partial removal, and online SCN authorization. Critical safety module with extensive VIN-locking.
Rear Electric Drive Unit Control Module (EDU-R)3.2 hr R&Rsecurity gateway +1.2 hr▸ programming details
📍 Mounted on rear electric motor assembly under cargo floor
🔧 Xentry Diagnostics + Vediamo/Monaco with MBD account
⚠️ Controls memory, heating, ventilation, massage. Most aftermarket tools can code basic functions.
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2026 Mercedes-Benz EQS SUV AMG 53 4MATIC Dual Motor AWD and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Mechanic · 20+ years.