Unlock any single procedure for $3 — or become the founding sponsor and we generate every common job on this GLS600 Maybach X167, with your name on each one.
Fitment notes: OEM size: 12V ~12Ah AGM auxiliary battery (Mercedes AUX/backup battery, e.g. AUX14L class) · Location: Engine compartment, near the main battery / firewall area (exact position varies by build) · Purpose: Voltage support / backup power for critical safety and comfort electronics during start-stop and ISG (mild-hybrid) operation
As an Amazon Associate and Autel/ANCEL partner, OLP earns from qualifying purchases — how we link. This never changes the specs we publish.
Every control module on the 2021-2026 Mercedes-Benz GLS600 Maybach X167 — 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)3.5 hr R&Rsecurity gateway +1.0 hr▸ programming details
📍 Transmission housing, driver side near valve body
⚠️ Controls dual fuel pumps; adaptation required after replacement
Radar Sensor Control Unit - Rear Right (RSU-RR)0.8 hr R&Rdealer / factory tool +0.8 hr▸ programming details
📍 Rear bumper, right corner behind trim
🔧 Xentry Diagnostics
⚠️ Blind spot assist; calibration required after replacement
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 GLS600 Maybach X167 4.0L V8 BiTurbo M176 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years.