Brand Name:
BMW
Model Number:
GA8G45AW
Function: Aisin AW-designed 8-speed transverse automatic (TF-80SC lineage) for FWD/AWD platforms (torque capacity 450Nm).
Key Features:
Shift Logic: BMW/Mini-specific programming with sport/eco modes
Start-Stop Ready: Reinforced auxiliary pump maintains hydraulic pressure
Modular Construction: Separate mechatronics unit (simplifies repairs)
Common Failures:
Solenoid Wear: Particularly shift solenoids 3/5 (P17D1/P17D4)
Converter Clutch Shudder: Lockup judder from worn apply piston (P0741)
Case Leaks: Main seal failure near differential output
Critical Service Notes:
Fluid: Only BMW/Mini ATF-3 (5.5L capacity)
Adaptations Reset: Required after fluid service (ISTA/P required)
Thermal Management: Monitor oil temp – sustained >120°C degrades fluid
Pro Tip: Check mechatronic sleeve seals during fluid changes – seepage causes erratic shifts.
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