Fitment notes: OEM size: 12V 12Ah AGM auxiliary (Mercedes-Benz AUX12/AUX14L-class, A000 982 xx xx) · Location: Engine compartment, separate from the main AGM starter battery (typically near the firewall on the right-hand side) · Purpose: Voltage support / backup power supply for ECUs and electrical systems, particularly during ISG start-stop engine restarts
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Every control module on the 2021-2026 Mercedes-Benz Maybach GLS — 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.
Transmission Control Unit (TCU)2.5 hr R&Rsecurity gateway +1.0 hr▸ programming details
⚠️ Requires Mercedes me connect subscription reactivation and online pairing.
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 2025 Mercedes-Benz Maybach GLS 4.0L Turbo V8 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years.