The current Toyota Sienna uses a hybrid powertrain: a 2.5-liter inline-four gasoline engine paired with electric motors, delivering about 245 total horsepower, with an electronic CVT and available front- or all-wheel drive. Earlier generations offered a traditional V6 with an automatic transmission.
Current generation engine and performance
Key details of the Sienna’s modern powertrain are outlined below:
- Engine: 2.5-liter inline-4 gasoline engine (Atkinson-cycle)
- Hybrid system: two electric motors and a battery pack integrated with the drivetrain
- Transmission: electronically controlled continuously variable transmission (eCVT)
- Combined output: about 245 horsepower
- Drivetrain options: front-wheel drive (standard) and all-wheel drive (available)
- Fuel economy: EPA estimates in the mid-30s mpg range, higher with FWD and slightly lower with AWD
Overall, the hybrid setup emphasizes efficiency and smooth, quiet operation, with AWD available at the cost of a bit of efficiency and added weight.
Past engine options
For context, earlier Sienna models used a traditional gasoline V6:
- Engine: 3.5-liter V6 (2GR-FE)
- Power output: roughly 266 horsepower
- Transmission: 6-speed automatic
- Drivetrain options: front-wheel drive with optional all-wheel drive
- Production window: primarily in the 2011–2020 era (before the switch to hybrid-only in 2021)
That V6 setup offered strong acceleration and towing capability, but Toyota shifted Sienna entirely to hybrid power from 2021 onward to prioritize efficiency and lower emissions.
Summary
In short, today’s Sienna is powered by a 2.5-liter hybrid inline-4 with dual electric motors, delivering about 245 hp and available in FWD or AWD. Prior to 2021, the Sienna used a traditional 3.5-liter V6 with a 6-speed automatic. The move to hybrid power reflects a broader industry push toward electrified family vehicles while preserving practicality and space.