Description
Factory Mercedes-Benz GLS Class Workshop Manual (2019-2022)
This is the official factory-level workshop manual for the Mercedes-Benz GLS Class X167, covering every service and repair procedure used by authorized Mercedes-Benz dealerships across the United States and worldwide.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | M256 3.0L I-6 turbocharged (GLS 450, 362 hp), M176 4.0L V8 twin-turbo (GLS 580/600), M177 4.0L V8 twin-turbo (AMG GLS 63, 603 hp) |
| Diesel | OM656 3.0L inline-6 turbodiesel |
| Transmissions | 9G-TRONIC 9-speed automatic; AMG SPEEDSHIFT TCT 9-speed |
| Drive | 4MATIC all-wheel drive (standard) |
| Model Years | 2019-2022 |
| Badge Twins | N/A |
Common GLS Class Repairs Covered
| System | Procedures |
|---|---|
| E-ACTIVE BODY CONTROL Suspension | Hydraulic strut replacement, level sensor calibration, fault code diagnosis for ABC suspension warning lights |
| M256 48V EQ Boost System | Integrated starter-generator service, belt-starter generator removal/installation, mild-hybrid battery inspection |
| Transfer Case & 4MATIC Drivetrain | Front and rear differential fluid service, transfer case actuator replacement, driveshaft removal and rebalancing |
| MBUX Infotainment & Electrical | Control unit replacement, wiring harness diagnostics, ADAS sensor alignment and calibration procedures |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Which GLS 450 engine variants are included – does the manual cover the 48V mild-hybrid EQ Boost system?
Yes. The GLS 450 uses the M256 3.0L inline-6 paired with Mercedes-Benz’s EQ Boost integrated starter-generator operating on a 48-volt mild-hybrid architecture. The manual provides complete service procedures for both the combustion engine and the 48V electrical subsystem, including ISG removal, belt-starter generator diagnostics, and high-voltage safety precautions required before working on these components.
Does this manual cover the AMG GLS 63 specifically?
Yes. The AMG GLS 63 variant, powered by the M177 4.0L V8 twin-turbo producing 603 hp and mated to the AMG SPEEDSHIFT TCT 9-speed transmission, is fully documented. AMG-specific procedures include performance exhaust service, AMG Ride Control+ suspension calibration, and transmission adaptation resets unique to the SPEEDSHIFT unit.
Are wiring diagrams and ADAS calibration procedures included?
Full electrical documentation is provided, covering MBUX infotainment circuits, E-ACTIVE BODY CONTROL wiring, power distribution schematics, connector pinouts, and ground locations. Advanced driver assistance system (ADAS) calibration procedures for radar, camera, and ultrasonic sensors are also detailed, along with the diagnostic fault code lookup processes used by Mercedes-Benz technicians.
What format is the manual?
This manual is delivered as a PDF file. After completing your purchase you receive an instant download link, and the file can be accessed again at any time through your account. The searchable PDF is compatible with Windows and Mac computers, tablets, and smartphones, and individual pages or full sections can be printed as needed.
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