2021 Toyota Sienna Hybrid Engine Problems
- Complaints
- 3about this part
- Share
- 7%of 45 total for the year
- Median mileage
- 40,050miles
- Trend
- Not enough dataFewer than 15 complaints, too few for a reliable trend.
NHTSA recorded 3 complaints about the engine of the 2021 Toyota Sienna Hybrid, 7% of the 45 complaints for this model year. Where a mileage was given, the median is 40,050 miles. 1 a fire, according to the filers.
Fewer than 15 complaints name this part, so treat the figures as a rough indication only.
Example complaints
Selected from NHTSA records; personal details are removed. They are consumer reports, not findings.
“We were stopped at a stoplight. As soon as we stepped on the gas pedal, there was a loud clunk sound and plastic parts started flying out from under the car. We immediately pulled over. Oil was spilling out everywhere. The transmission oil pump was laying on the inside of the engine compartment. We had towed to Toyota. They diagnosed a bent piston went through engine which also caused a hole in the transmission. I had it towed for a 2nd opinion. Neither toyota or the 2nd opinion had ever seen anything like it. …”
NHTSA complaint #11730547, filed 2026-04“The contact owned a 2021 Toyota Sienna Hybrid. The vehicle was parked in the driveway when an explosion occurred; the vehicle burned down. The contact was inside the residence when a loud noise was heard, and the house rocked. The contact ran to the front of the house to investigate and noticed that the vehicle was engulfed in flames. The fire damaged the driveway, melted the garage door, and melted a landscaping retaining wall. The fire damaged the post on the front porch. …”
NHTSA complaint #11729036, filed 2026-04, 80,000 miles“The contact owns a 2021 Toyota Sienna Hybrid. The contact stated while attempting to make a right turn with the accelerator pedal depressed, the vehicle failed to respond. The contact stated no warning light was illuminated. The contact stated that he had experienced the failure on several occasions. The vehicle was not diagnosed nor repaired. A dealer was not contacted. The manufacturer had not been informed of the failure. The failure mileage was approximately 100. The VIN was not available.”
NHTSA complaint #11404950, filed 2021-03, 100 milesRelated service bulletins
- 11037202Aug 20, 2026OBSOLETE NOTICE August 20, 2026: This bulletin is now obsolete. Please see T-SB-0051-26.
- 11037201Aug 20, 2026This bulletin includes basic procedures for performing a rescue charge at battery on high voltage (HV) Ni-MH and Li-ion batteries.
- 11037186Aug 11, 2026Although the flow shut-off valve is covered by Toyota’s New Vehicle Limited Warranty for 36 months or 36,000 miles (whichever comes first), we at Toyota care about the customers’…
- 11029896Feb 27, 2026OBSOLETE NOTICE February 27, 2026: This bulletin is no longer applicable and is now obsolete.
- 11022949Aug 7, 2025The specific condition covered by this program is for a small engine coolant leak that can occur from the flow shut-off valve that can allow coolant to drip on other parts of the…
- 11020668Jun 19, 2025Some 2018 – 2021 model year Toyota vehicles equipped with an A25A-FKS, A25A-FXS, or M20A-FKS engine may exhibit a condition in which an “Engine Maintenance Required” message is…
- 11016794Feb 20, 2025Although the flow shut-off valve is covered by Toyota’s New Vehicle Limited Warranty for 36 months or 36,000 miles (whichever comes first), we at Toyota care about the customers’…
- 11015508Feb 20, 2025Although the flow shut-off valve is covered by Toyota’s New Vehicle Limited Warranty for 36 months or 36,000 miles (whichever comes first), we at Toyota care about the customers’…
- 11015882Feb 12, 2025OBSOLETE NOTICE February 11, 2025: This bulletin is now obsolete. Please see T-SB-0021-25.
- 11016782Feb 10, 2025Flash reprogramming allows the Electronic Control Unit (ECU) software to be updated without replacing the ECU. Flash calibration updates for specific vehicle models/ECUs are…
Engine: other model years
| Year | Complaints | Share of year |
|---|---|---|
| 2024 | 7 | 10% |
| 2021 | 3 | 7% |
Other parts of the 2021 Toyota Sienna Hybrid
13 complaintsBrakes
9 complaintsSeats
5 complaintsBody and structure
5 complaintsVisibility (wipers, defrost, mirrors)
5 complaintsElectrical system
4 complaintsOther or unknown
3 complaintsExterior lighting
2 complaintsSuspension
2 complaintsTransmission and drivetrain
2 complaintsBack-over prevention (rear camera)
1 complaintsForward collision avoidance
1 complaints
← All problems reported for the 2021 Toyota Sienna Hybrid
About this data. Data from NHTSA (ODI) complaints, recalls, TSBs and investigations, updated Oct 30, 2026. Complaints are unverified consumer reports and may be duplicated or inaccurate.
To check a specific vehicle for open recalls, use its VIN at nhtsa.gov/recalls. Methodology