Description
Factory Mercedes GLS Class GLS400 4Matic Workshop Manual (2015–2019)
This is the official factory-level service manual for the Mercedes-Benz GLS400 4Matic — the full-size luxury SUV built on the X166 platform and sold across the United States from 2015 through 2019. Technicians and owners get the same depth of repair data used by authorized Mercedes-Benz dealerships.
Powertrain & Drive Coverage
| Component | Variants Covered |
|---|---|
| Petrol | M276 3.0L V6 Biturbo (~329 hp) |
| Diesel | N/A |
| Transmissions | 9G-TRONIC 9-speed automatic |
| Drive | Permanent 4Matic AWD |
| Model Years | 2015–2019 (X166 chassis) |
| Badge Twins | Mercedes-Benz GL Class (predecessor, same platform) |
Common GLS400 Repairs Covered
| System | Procedures |
|---|---|
| M276 Timing Chain | Tensioner replacement, chain guide inspection, and timing procedure — a known wear item on this engine |
| Airmatic Suspension | Air strut replacement, compressor diagnostics, height sensor calibration |
| 9G-TRONIC Transmission | Fluid and filter service, conductor plate replacement, valve body diagnostics |
| Brake System | Front and rear pad/rotor replacement, EPB actuator service, brake fluid flush procedure |
Format & Delivery
PDF. Instant download; lifetime re-downloads.
Frequently Asked Questions
Is the M276 timing chain really a common problem on the GLS400?
Yes. The M276 3.0L V6 biturbo is known for timing chain tensioner wear, particularly on higher-mileage examples. The manual provides complete factory procedures for tensioner replacement, chain guide inspection, and re-timing the engine to correct specifications — the same steps Mercedes dealers follow.
What chassis code does this manual cover, and how does it relate to the GL Class?
This manual covers the X166 chassis, which Mercedes introduced in 2013 as the GL Class before rebranding the lineup as the GLS in 2016. The 2015 model year carries both designations in dealer literature; this manual addresses GLS400 4Matic variants across the full 2015–2019 production run on that shared platform.
Does the manual include Airmatic air suspension diagnostics?
Yes. The suspension section covers the full Airmatic system fitted to the GLS400, including air strut removal and installation, compressor output testing, ride-height sensor replacement, and the diagnostic fault codes used to pinpoint suspension faults before parts are ordered.
What format is the manual?
The manual is delivered as a PDF. After purchase you receive an instant download link. The file is fully searchable by keyword, system, or component, and individual pages can be printed for use at your workbench. No subscription or special software is required — any standard PDF reader on a computer, tablet, or phone will open it.
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