BMW 340i 2012-2018

BMW 340i 2012-2018 ZF 8HP Transmission Specifications

Detailed technical specifications and operational parameters for the ZF 8HP automatic transmission system used in the 2012-2018 BMW 340i. This document covers gear ratios, torque capacity, fluid requirements, shift logic, and diagnostic codes specific to this transmission model.

Updated Oct 24, 2023

Overview Specifications

Comprehensive description of the ZF 8HP transmission specifications for the 2012-2018 BMW 340I, including key features, measurements, and technical details.

How to Use

Use the search function to locate specific ZF 8HP transmission specifications by entering keywords such as 'torque capacity', 'gear ratios', or 'fluid capacity'.

Navigate through the documentation sections using the table of contents or by scrolling through the major sections and subsections.

Key Specifications

Transmission Type

8-speed automatic

Torque Capacity

500 Nm (368.8 lb-ft)

Fluid Capacity

9.5 liters (10.0 quarts)

Weight

87 kg (191.8 lbs)

Shift Time

200 milliseconds

Available Specifications

Transmission Design and Architecture

Details about the design, architecture, and key components of the ZF 8HP transmission.

Transmission Layout

8-speed automatic transmission with a compact design
Modular construction for adaptability across vehicle platforms
Integrated torque converter with lock-up clutch
Electro-hydraulic control system for precise gear shifts
Weight: Approximately 87 kg (191.8 lbs)

Gear Ratios

1st gear: 5.000:1
2nd gear: 3.200:1
3rd gear: 2.143:1
4th gear: 1.720:1
5th gear: 1.314:1
6th gear: 1.000:1
7th gear: 0.822:1
8th gear: 0.640:1
Reverse gear: 4.917:1

Note: Gear ratios optimized for performance and fuel efficiency.

Performance Specifications

Technical details about the performance capabilities of the ZF 8HP transmission.

Torque Capacity

Maximum torque capacity: 500 Nm (368.8 lb-ft)
Designed to handle high-performance engines
Supports dynamic driving modes (Sport, Comfort, Eco Pro)

Shift Times

Shift times as low as 200 milliseconds
Adaptive shift strategy for smooth transitions
Supports manual shifting via paddle shifters

Note: Shift times vary based on driving mode and conditions.

Maintenance and Fluid Specifications

Information about maintenance requirements and fluid specifications for the ZF 8HP transmission.

Fluid Capacity

Total fluid capacity: 9.5 liters (10.0 quarts)
Fluid type: ZF Lifeguard 8 transmission fluid
Fluid change interval: 80,000 km (50,000 miles) or as recommended

Service Requirements

Regular inspection of transmission mounts and seals
Diagnostic scans for fault codes using BMW ISTA software
Replacement of transmission filter during fluid changes

Note: Use only ZF-approved fluids and components for maintenance.

Integration with BMW 340I

Details about how the ZF 8HP transmission integrates with the BMW 340I's drivetrain and electronics.

Drivetrain Compatibility

Compatible with BMW's xDrive all-wheel-drive system
Seamless integration with the N55B30 engine
Supports BMW's EfficientDynamics technology

Electronic Control

Integrated with BMW's EGS (Electronic Transmission Control) system
Supports adaptive shift mapping based on driving style
Compatible with BMW's Driving Experience Control modes

Note: Transmission software updates available through BMW dealerships.

Search Specifications

Search by specification name, value, or description

Transmission Specifications

General information

Transmission Type: 8-speed automatic

Manufacturer: ZF Friedrichshafen AG

Model: 8HP

Part Number: 8HP50

Application: 2012-2018 BMW 340I

Fluid Type: ZF Lifeguard 8

Fluid Capacity: 9.5 liters

Dimensions And Weight

Length: 720 mm

Width: 550 mm

Height: 400 mm

Weight: 87 kg

Gear Ratios

1st Gear: 4.714

2nd Gear: 3.143

3rd Gear: 2.106

4th Gear: 1.667

5th Gear: 1.285

6th Gear: 1.000

7th Gear: 0.839

8th Gear: 0.667

Reverse Gear: 3.317

Torque Capacity

Maximum input Torque: 500 Nm

Maximum Output Torque: 600 Nm

Operational Parameters

Maximum Engine Speed: 7000 rpm

Maximum Transmission Speed: 8000 rpm

Operating Temperature Range: -40°C to 150°C

Shift Response Time: 200 ms

Fluid Specifications

Fluid Type: ZF Lifeguard 8

Fluid Viscosity: 7.5 cSt at 100°C

Fluid Change interval: 60,000 miles or 48 months

Fluid Pressure: 3.5 bar

Electronic Control

Control Unit: EGS (Electronic Transmission Control)

Sensors

Input speed sensor
Output speed sensor
Temperature sensor
Pressure sensor

Communication Protocol: CAN bus

Maintenance Specifications

Filter Change interval: 60,000 miles or 48 months

Seal inspection Interval: 60,000 miles or 48 months

Torque Converter inspection Interval: 100,000 miles or 72 months

Fluid Level Check interval: 30,000 miles or 24 months

Diagnostic Specifications

Diagnostic Tool: BMW ISTA

Fault Codes

P0700 - Transmission Control System Malfunction
P0715 - Input/Turbine Speed Sensor Circuit Malfunction
P0720 - Output Speed Sensor Circuit Malfunction

Diagnostic Procedure: Use ISTA to read fault codes and perform system tests

Safety information

Warning: Ensure transmission is cool before performing maintenance

Precaution: Use only specified transmission fluid to avoid damage

Note: Always follow BMW service procedures to maintain warranty

Service Information Service

Detailed service requirements and schedules for the ZF 8HP transmission

30,000 miles

24 months

Check transmission fluid level
Inspect for leaks
Check transmission mounts

Ensure fluid level is within specified range

60,000 miles

48 months

Change transmission fluid
Replace transmission filter
Inspect seals and gaskets

Use only ZF Lifeguard 8 fluid

100,000 miles

72 months

Inspect torque converter
Check transmission control unit
Perform full diagnostic scan

Replace any worn components as necessary

Common Questions

Find answers to common questions about torque specifications

What is the torque capacity of the ZF 8HP transmission in the 2012-2018 BMW 340i?

The ZF 8HP transmission used in the 2012-2018 BMW 340i has a torque capacity of up to 500 Nm (369 lb-ft). This makes it suitable for the high-performance N55 and B58 engines used in these models.

What type of transmission fluid is recommended for the ZF 8HP transmission?

ZF Lifeguard 8 is the recommended transmission fluid for the ZF 8HP transmission. It is specifically formulated for this transmission type and ensures optimal performance and longevity. The fluid capacity is approximately 9.5 liters, but always refer to the vehicle's service manual for exact specifications.

How often should the transmission fluid be changed in the ZF 8HP transmission?

BMW recommends a transmission fluid and filter change every 60,000 to 100,000 miles (or 8 years) under normal driving conditions. However, for vehicles subjected to severe driving conditions, such as frequent towing or high-performance use, the interval should be reduced to 50,000 miles.

What are the common symptoms of a failing ZF 8HP transmission?

Common symptoms include harsh or delayed shifting, transmission slipping, unusual noises (e.g., whining or grinding), and the illumination of the transmission warning light. If any of these symptoms occur, it is recommended to have the transmission inspected by a certified BMW technician.

Can the ZF 8HP transmission be reprogrammed or updated?

Yes, the ZF 8HP transmission can be reprogrammed or updated with the latest software from BMW. This can improve shift quality, performance, and fuel efficiency. Updates should be performed by a BMW dealership or a certified technician using the appropriate diagnostic tools.

Factory Service Resources

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

ZF 8HP Transmission Technical Manual

Coming Soon

Official technical manual from ZF for the 8HP transmission, covering installation, maintenance, and troubleshooting procedures.

BMW 340i Service Schedule

Coming Soon

Detailed service schedule for the 2012-2018 BMW 340i, including transmission fluid change intervals and recommended maintenance tasks.

ZF Lifeguard 8 Fluid Specifications

Coming Soon

Technical specifications and compatibility information for ZF Lifeguard 8 transmission fluid, including usage guidelines and safety precautions.

BMW ISTA Diagnostic Software Guide

Coming Soon

Guide to using BMW's ISTA diagnostic software for transmission diagnostics, updates, and reprogramming.

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Technical Information

All specifications, including torque values, fluid capacities, and maintenance procedures, should be verified against your vehicle's factory service manual.
Vehicle specifications and procedures may vary by model year, trim level, and region.
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