Description
Factory Mercedes GLS Class Workshop Manual (2016-2022)
This official Mercedes-Benz GLS Class factory workshop manual delivers dealer-grade repair and service procedures for US technicians and enthusiasts maintaining X166 and X167 platform vehicles from model years 2016 through 2022.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | M276 3.0L V6 twin-turbo (GLS 400/450), M278 4.7L V8 twin-turbo (GLS 500/550), M177 4.0L V8 twin-turbo (AMG GLS 63), M256 inline-6 EQ Boost (GLS 450/580) |
| Diesel | OM642 3.0L V6 (GLS 350d) |
| Transmissions | 7G-TRONIC PLUS 7-speed automatic, 9G-TRONIC 9-speed automatic, AMG SPEEDSHIFT TCT |
| Drive | 4MATIC AWD (all variants) |
| Model Years | 2016-2022 |
| Badge Twins | N/A |
Common GLS Class Repairs Covered
| System | Procedures |
|---|---|
| AIRMATIC Air Suspension | Compressor replacement, air strut service, ride-height sensor calibration – a known wear point on X166 models |
| Engine Cooling | Thermostat housing replacement, coolant flush, water pump service for M276 and M278 engines |
| Transmission | 9G-TRONIC fluid and filter service, valve body inspection, shift adaptation reset |
| Brake System | Front and rear pad/rotor replacement, brake fluid flush, SBC/ESP sensor diagnostics |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Why does my GLS AIRMATIC suspension keep sagging or throwing warning lights?
The AIRMATIC air suspension compressor and air struts are a well-documented wear item on X166-generation GLS models. This manual provides full diagnostic flowcharts, compressor replacement procedures, air strut removal steps, and ride-height sensor recalibration sequences to resolve these faults correctly.
Does this manual cover both the X166 and X167 GLS chassis?
Yes. The manual spans the X166 first-generation chassis (2016-2019 model years) and the X167 second-generation chassis (2020-2022 model years), with model-specific procedures, torque specifications, and wiring diagrams for each platform.
Are wiring diagrams and ADAS system procedures included?
Full electrical schematics are included for every circuit, covering the COMAND infotainment system, AIRMATIC control modules, Active Brake Assist, Distronic Plus adaptive cruise, and all lighting systems. Diagrams are color-coded with connector pin assignments and ground-point locations.
What format is the manual?
This manual is a PDF file delivered via instant download upon purchase. It is fully searchable, printable, and compatible with Windows, Mac, iOS, and Android devices. Re-downloads are available for life at no additional charge.
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