Fitment notes: OEM size: AUX14L (12V 12Ah AGM auxiliary/support battery) · Location: engine compartment, mounted separately from the main 12V battery (typically front right area near the cowl; some builds locate it with the main battery under the load-compartment floor) · Purpose: voltage support / backup power for the electrical system and electronics during start-stop and 48V EQ Boost ISG restarts
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Every control module on the 2020-2026 Mercedes-Benz GLE63 AMG — 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
⚠️ Controls memory, heating, ventilation, massage. Two modules (left/right).
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 GLE63 AMG 4.0L V8 BiTurbo M177 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years.