Dealer-Trained Master Technicians | Since 1958 **Toyota Sienna Transmission Problems Edmonton (UA80 8-Speed 2021-2024)** The 2021 to 2024 Toyota Sienna minivan uses a hybrid-only drivetrain — so its transmission is an eCVT rather than the UA80 automatic. However, the electric transaxle can develop concerns at higher mileage. Auto Imports advises Sienna owners on drivetrain concerns.
SIENNA HYBRID ECVT DRIVETRAIN
- 2021+ Sienna: hybrid-only with eCVT — no conventional transmission shudder
- Inverter concerns: same hybrid inverter failure risk as other Toyota hybrids at 200,000+ km
- 12V auxiliary battery: failure causes system lockout — replace every 4-6 years
- Battery pack: NiMH or Li-ion; 10-12 year expected lifespan
OLDER SIENNA (2011-2020) 3.5L V6
- 6-speed or 8-speed automatic: generally reliable; fluid service every 80,000 km
- V6 VVT-i: timing chain at 200,000+ km; very durable
Service at Auto Imports
- Hybrid system diagnostic and 12V battery service
- Transmission fluid service on non-hybrid models
- Up to 3-year / 60,000km warranty. Financing available OAC.
Auto Imports is Edmonton’s most reviewed independent auto repair facility with hundreds of 5-star reviews.
Auto Imports is a CAA Approved auto repair facility — one of a select group of independent shops in Edmonton to earn this designation.
Battery Edmonton | Minivan Repair Edmonton
FREQUENTLY ASKED QUESTIONS
Does the Toyota Sienna have transmission problems?
The 2021+ hybrid-only Sienna has an eCVT that is generally reliable — main concerns are inverter and HV battery at high mileage and 12V battery replacement. Older 2011-2020 V6 Siennas have very reliable 6-speed and 8-speed automatics.
hybrid eCVT generally reliable; inverter and HV battery at high mileage; 12V critical Auto Imports | 9904 75 Ave NW, Edmonton | 780-431-2828 | Mon–Fri 7:30 AM — 5:00 PM to Bumper network. Minimum 1-year / 20,000km on parts and labour.
Deductible may apply.
