TOYOTA SIENNA 21-25 AUTOMATIC TRANSMISSION GEAR BOX HYBRID 2.5L AWD OEM
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TOYOTA SIENNA 21-25 AUTOMATIC TRANSMISSION GEAR BOX HYBRID 2.5L AWD OEM

A Toyota Sienna 21-25 with a 2.5L hybrid engine and Electronic On-Demand All-Wheel Drive (AWD) uses a hybrid transmission (eCVT) system, not a conventional gearbox, which is comprised of a 2.5L 4-cylinder engine, electric motors, and a continuously variable transmission. The “”OEM”” refers to Original Equipment Manufacturer, indicating the component is a genuine part designed by Toyota for that specific vehicle, ensuring quality and proper fit. 

Understanding the Components
  • Engine:

    The 2.5-liter 4-cylinder engine provides power to the hybrid system. 

  • Electric Motors:

    These motors add power and assist in driving, especially at lower speeds or during acceleration. 

  • eCVT:

    The “eCVT” (electronic Continuously Variable Transmission) is a hybrid transmission that allows for smooth power delivery without distinct gear changes. 

  • AWD System:

    The “Electronic On-Demand” AWD system uses a separate electric motor on the rear axle to provide power when needed, enhancing traction and agility without a mechanical connection to the front wheels. 

What “OEM” Means 

  • Original Equipment Manufacturer:
    This means the transmission is a genuine Toyota part, manufactured by or for Toyota.
  • Benefits:
    Genuine OEM parts are built to the exact specifications of the vehicle, offering optimal performance, durability, and compatibility.

Why You Might Look for an OEM Part 

  • Reliability:You want a part that will perform as intended and last a long time.
  • Perfect Fit:OEM parts are guaranteed to fit your specific 2021-2025 Sienna model.
  • Quality:You are getting a high-quality component directly from the source.
The Toyota Sienna (2021-2025) uses an Electronic Continuous Variable Transmission (ECVT) and an Electronic On-Demand All-Wheel Drive system for its 2.5L hybrid powertrain, which achieves 245 net combined horsepower. The hybrid system includes permanent magnet synchronous motors and a sealed Nickel-Metal Hydride (Ni-MH) battery. The transmission does not have a fixed number of gears like a traditional automatic; instead, it continuously adjusts to optimize engine and electric motor performance for efficiency and power delivery.
 

Key Specifications for the 2021-2025 Sienna Hybrid AWD
  • Transmission Type: Electronic Continuous Variable Transmission (ECVT) with Electronic On-Demand All-Wheel Drive. 
  • Engine: 2.5-liter, 4-cylinder, naturally aspirated hybrid engine. 
  • Horsepower: 245 net combined horsepower. 
  • Drivetrain: Electronic On-Demand All-Wheel Drive. 
  • Electric Motors: Two permanent magnet synchronous motors are located in the front, and one in the rear for AWD models. 
  • Battery: Sealed Nickel-Metal Hydride (Ni-MH) traction battery. 
  • Drive Modes: Normal, Eco, EV, and Sport modes for varied driving characteristics. 

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