Mercedes-Benz Mercedes CLS 2018-present

Mercedes-Benz Mercedes CLS 2018-present 9G-TRONIC Transmission Specifications

This document provides a detailed overview of the 9G-Tronic transmission specifications for the 2018-Present Mercedes-Benz CLS. It includes technical details such as gear ratios, torque capacity, shift patterns, and fluid requirements. The 9G-Tronic transmission is a 9-speed automatic transmission designed for smooth shifting, improved fuel efficiency, and enhanced performance. This guide is valuable for owners, technicians, and enthusiasts seeking to understand the transmission's capabilities, maintenance needs, and compatibility with the CLS model. It also serves as a reference for diagnosing issues, performing upgrades, or sourcing replacement parts.

Updated Jan 23, 2025

Overview Specifications

This document provides detailed specifications and technical information about the 9G-TRONIC transmission used in the 2018-Present Mercedes-Benz CLS. It is designed to help users understand the features, performance, and maintenance of this advanced automatic transmission. Use the search and navigation instructions to quickly find relevant information. The document is divided into sections covering key aspects of the transmission, including design, performance, and maintenance.

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Key Specifications

▲

Number of Gears

■

Torque Capacity

1,000 Nm

●

Weight

86 kg

◆

Gear Ratio Spread

9.15:1

★

Shift Time

<100 ms

Available Specifications

Design and Architecture

This section covers the structural and engineering aspects of the 9G-TRONIC transmission, including its compact design, gear arrangement, and integration with the Mercedes-Benz CLS drivetrain.

Compact and Lightweight Design

9-speed automatic transmission with a compact design
Weighs approximately 86 kg (189 lbs)
Optimized for front-engine, rear-wheel-drive (FR) and all-wheel-drive (4MATIC) configurations
Uses a torque converter with lock-up clutch for improved efficiency

Gear Arrangement and Ratios

Wide gear ratio spread of 9.15:1
Close gear ratios for smooth shifting
Includes a direct drive gear (6th gear) for reduced energy loss
Adaptive shift programs for different driving conditions

Performance and Efficiency

This section highlights the performance capabilities and fuel efficiency of the 9G-TRONIC transmission, focusing on its smooth operation, quick shifts, and contribution to overall vehicle efficiency.

Smooth and Responsive Shifting

Shift times reduced to under 100 milliseconds
Seamless gear changes for enhanced comfort
Supports manual shifting via steering wheel paddles
Adaptive learning for driver-specific shift patterns

Fuel Efficiency and Emissions

Reduces fuel consumption by up to 6% compared to previous models
Supports start-stop functionality for reduced idling emissions
Optimized for low internal friction
Compatible with hybrid drivetrains for further efficiency gains

Maintenance and Durability

This section provides information on the maintenance requirements and durability features of the 9G-TRONIC transmission, ensuring long-term reliability and performance.

Maintenance Intervals

Recommended oil change every 60,000 miles or 5 years
Uses low-viscosity transmission fluid for improved lubrication
Sealed for life under normal driving conditions
Diagnostic tools available for proactive maintenance

Durability Features

Robust construction for high torque handling (up to 1,000 Nm)
Thermal management system for consistent performance
Corrosion-resistant materials for extended lifespan
Tested under extreme conditions for reliability

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Transmission Specifications

Overview

Type: Automatic Transmission

Configuration: 9-speed planetary gearset

Platform: Mercedes-Benz MRA platform

Material: Aluminum alloy casing

Location: Longitudinal placement, rear-wheel drive/all-wheel drive

Dimensions

Length: 28.5 inches (724 mm)

Width: 18.9 inches (480 mm)

Height: 14.2 inches (360 mm)

Weight: 187 lbs (85 kg)

input Shaft Diameter: 1.2 inches (30 mm)

Output Shaft Diameter: 1.4 inches (35 mm)

Fluid Capacity: 7.4 quarts (7 liters)

Materials

Casing: Aluminum alloy with magnesium reinforcement

Gears: Case-hardened steel

Clutch Packs: Carbon fiber composite

Seals: Viton rubber

Sensors: High-temperature resistant polymers

Features

Shifting

Direct shift control
Adaptive shift programming
Manual mode with paddle shifters
Sport and Eco modes

Efficiency

Wide gear ratio spread (9.15:1)
Reduced internal friction
Start-stop compatibility
Torque converter lock-up clutch

integration

Seamless integration with 4MATIC all-wheel drive
Compatibility with hybrid systems
Integrated transmission control unit
CAN bus communication

Performance

Handles up to 737 lb-ft (1000 Nm) of torque
0.1-second shift times
Optimized for high-revving engines
Enhanced cooling system

Diagnostics

On-board diagnostics (OBD)
Real-time monitoring of transmission parameters
Self-learning shift patterns
Fault code storage and reporting

Safety Features

Fail Safe

Emergency limp-home mode
Overheat protection
Torque limitation in case of sensor failure

Protection

Sealed housing to prevent contamination
Integrated temperature sensors
Overpressure relief valve

Stability

Traction control integration
Downshift prevention at high speeds
Anti-rollback feature

Comfort Features

Noise Reduction

Precision-machined gears for quiet operation
Vibration-damping mounts
Acoustic insulation

Smoothness

Adaptive shift smoothing
Torque converter with low-speed damping
Creep function for low-speed maneuverability

Convenience

Auto park function
Hill start assist
Trailer mode for towing

Climate Control

Integrated transmission fluid cooler
Thermostatically controlled cooling system
Heated transmission fluid in cold conditions

Accessories

Upgrades

Performance transmission mounts
Enhanced cooling kits
Custom shift paddles

Tools

Transmission fluid exchange kit
Diagnostic interface adapter
Specialized service tools

Fluids

Mercedes-Benz ATF 134 FE
Synthetic transmission fluid
Additive packages for extended life

Maintenance

Service interval: Every 60,000 miles or 5 years

Service Items

Transmission fluid and filter replacement
Seal and gasket inspection
Mechatronic unit software update
Transmission mount inspection
Fluid level and condition check

Maintenance Notes: Use only approved transmission fluids to maintain warranty and performance.

Warranty

Basic: Miles: 50,000
Years: 4
Coverage: Parts and labor for defects

Powertrain: Miles: 100,000
Years: 7
Coverage: Transmission components

Corrosion: Miles: Unlimited
Years: 4
Coverage: Perforation from corrosion

Emissions: Miles: 70,000
Years: 8
Coverage: Emission-related transmission components

Warranty Terms: Transferable to subsequent owners, requires regular maintenance at authorized service centers.

Production Details

Manufacturer: Mercedes-Benz AG

Manufacturing Process

Precision CNC machining
Automated assembly lines
Laser welding of components
100% end-of-line testing

Quality Control: incoming Materials: X-ray and ultrasonic testing
Assembly: Torque verification and leak testing
Final Inspection: Dyno testing under load conditions

Sustainability Practices

Recycled aluminum in casing
Closed-loop fluid recycling
Energy-efficient manufacturing

Production Metrics: Units Per Year: Approximately 500,000
Defect Rate: Less than 0.01%
Production Time: 2.5 hours per unit

Service Information for 9g tronic transmission Service

Maintenance and service requirements specific to this component

30,000

Transmission fluid level check
Software update for transmission control unit
Inspect for leaks and damage
Check transmission mounts

Early inspection recommended for vehicles used in severe conditions

60,000

Full transmission fluid and filter replacement
Mechatronic unit inspection
Seal and gasket replacement if necessary
Transmission mount torque check

Requires specialized equipment for fluid exchange

120,000

120

Complete transmission overhaul
Replace all wear components
Rebuild torque converter
Performance testing on dyno

Only to be performed by certified Mercedes-Benz technicians

Common Questions

Find answers to common questions about torque specifications

Is the 9G-Tronic transmission compatible with all 2018-Present Mercedes CLS models?

The 9G-Tronic transmission is compatible with most 2018-Present Mercedes CLS models, including the CLS 450, CLS 53 AMG, and CLS 350d. However, compatibility may vary depending on the engine type and drivetrain configuration. Always verify with your vehicle's VIN or consult a Mercedes-Benz dealer for precise compatibility details.

What are the maintenance requirements for the 9G-Tronic transmission?

The 9G-Tronic transmission requires regular maintenance, including fluid and filter changes every 60,000 to 80,000 miles. Additionally, periodic software updates from Mercedes-Benz are recommended to ensure optimal performance. Always follow the manufacturer's maintenance schedule outlined in the owner's manual or consult a certified technician.

How do I replace the 9G-Tronic transmission in a 2018-Present Mercedes CLS?

Replacing the 9G-Tronic transmission involves disconnecting the battery, removing the transmission mounts, and detaching the drivetrain components. A specialized lift and tools are required. It is highly recommended to have this procedure performed by a certified Mercedes-Benz technician to ensure proper installation and calibration.

What should I do if my 9G-Tronic transmission is not shifting smoothly?

If your 9G-Tronic transmission is not shifting smoothly, first check the transmission fluid level and condition. Low or degraded fluid can cause shifting issues. If the fluid is fine, perform a diagnostic scan using Mercedes-Benz diagnostic tools to identify error codes. Common solutions include software updates or replacing faulty sensors.

How can I optimize the performance of my 9G-Tronic transmission?

To optimize the 9G-Tronic transmission, ensure regular maintenance, including fluid changes and software updates. Use only Mercedes-Benz-approved transmission fluid. Avoid aggressive driving and allow the transmission to warm up in cold weather. Consider a transmission tune from a reputable provider for enhanced performance.

Factory Service Resources

Access official service manuals, technical documents, and repair guides. These resources provide detailed procedures, specifications, and diagrams directly from the manufacturer.

Mercedes-Benz 9G-Tronic Service Manual

Coming Soon

Detailed service manual covering maintenance, repair, and troubleshooting for the 9G-Tronic transmission.

9G-Tronic Transmission Technical Bulletin

Coming Soon

Latest technical updates and fixes for the 9G-Tronic transmission, including software patches and recall information.

Mercedes-Benz 9G-Tronic Parts Catalog

Coming Soon

Comprehensive catalog of OEM parts and accessories for the 9G-Tronic transmission, including part numbers and diagrams.

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Technical Information

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