Fitment notes: Battery located under passenger seat; requires proper AGM replacement due to start-stop system and extensive electronics
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Every control module on the 2018-2026 Mercedes-Benz G550 W463 — 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 +0.8 hr▸ programming details
📍 Transmission bell housing or valve body
🔧 Xentry + SCN online
⚠️ Requires transmission adaptation and online authorization
Signal Acquisition and Actuation Module Roof (SAM-Roof)2.0 hr R&Rsecurity gateway +0.8 hr▸ programming details
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 G550 W463 4.0L V8 BiTurbo M176 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.