Fitment notes: AGM battery required for start-stop system; located under hood on right side; auxiliary battery in rear cargo area
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Every control module on the 2020-2026 Mercedes-Benz GLS580 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.
Integrated Starter Generator Control Unit (ISG)4.5 hr R&Rsecurity gateway +1.5 hr▸ programming details
📍 Mounted to engine, between engine and transmission
🔧 Xentry Diagnostics + SCN online
⚠️ 48V mild hybrid system. VIN-locked. Requires high-voltage safety procedures and ISG calibration. Engine removal may be required.
Electric Power Steering Control Unit (EPS)2.8 hr R&Rsecurity gateway +1.0 hr▸ programming details
📍 Steering column, integrated with steering gear
🔧 Xentry Diagnostics + SCN online
⚠️ Requires steering angle sensor calibration and road test. VIN-locked.
Transmission Control Unit (TCU)2.5 hr R&Rsecurity gateway +1.0 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 GLS580 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 and Jeff Moore · Master Mechanic · 20+ years.