Transmission Description (G2057307): Overview

The ZF 8HP45 transmission is an electronically controlled, hydraulically operated, eight speed automatic unit. The hydraulic and electronic control elements of the transmission, including the Transmission Control Module (TCM), are incorporated in a single unit located inside the transmission and is known as 'Mechatronic'.

The ZF 8HP45 transmission has the following features:

• Designed to be maintenance free.
• Automatic Transmission Fluid (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 Transmission Control Module (TCM)
• Adaptive Shift Strategy (ASIS), to provide continuous adaptation 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) via FlexRay bus for communications
• Default mode if major faults occur
• Diagnostics available from the TCM via the FlexRay bus systems.

The transmission selections are made using the Transmission Control Switch (TCS) in the floor console. For additional information, Refer to: EXTERNAL CONTROLS