Transmission Description - Vehicles With: 8HP70 8-Speed Automatic Transmission AWD (G2413231): Overview

The 8HP70 transmission is an electronically controlled, hydraulically operated, 8 speed automatic unit.

A single unit known as the mechatronic valve block is located inside the transmission.

The mechatronic valve block contains the following control components:

• Hydraulic control elements
• Electronic control elements
• The Transmission Control Module (TCM).

The 8HP70 transmission has the following features:

• Designed to be maintenance free.
• The ATF  is 'fill for life'.
• The torque converter features a controlled slip feature with electronically regulated control of lock-up, creating a smooth transition to the fully locked condition.
• Shift programs controlled by the TCM  .
• Adaptive Shift Strategy (ASIS), to provide continuous adaption of shift changes to suit the driving style of the driver, which can vary from sporting to economical.
• Connected to the Powertrain Control Module (PCM) through the FlexRay systems bus for communications.
• Default mode if major faults occur
• Diagnostics available from the TCM  through the FlexRay systems bus.

The transmission selections are made using the TCS  in the floor console.

For additional information, Refer to: EXTERNAL CONTROLS - VEHICLES WITH: 8HP70 8-SPEED AUTOMATIC TRANSMISSION AWD

On vehicles featured with the stop/start system, the 8HP70 automatic transmission is equipped with a Hydraulic Impulse Storage (HIS) device. The HIS ensures pressurized ATF  is available to the shift elements as quickly as possible when the engine is started.