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Electrical systemPart report

2021 Toyota Sienna Hybrid Electrical system Problems

Complaints
4about this part
Share
9%of 45 total for the year
Median mileage
50,300miles
Trend
Not enough dataFewer than 15 complaints, too few for a reliable trend.

NHTSA recorded 4 complaints about the electrical system of the 2021 Toyota Sienna Hybrid, 9% of the 45 complaints for this model year. Where a mileage was given, the median is 50,300 miles.

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.

“The contact owns a 2021 Toyota Sienna Hybrid. The contact stated that the vehicle was experiencing inaccurate fuel gauge readings. The contact stated while starting the vehicle, the fuel gauge reading displayed that the fuel tank was empty; however, while the contact was attempting to refuel the vehicle at the gas station, she became aware that the fuel tank was not empty and that there was sufficient fuel in the vehicle. The vehicle was taken to the CarMax dealer, where it was driven and refueled several times; however, the failure could not be replicated. …”

NHTSA complaint #11596197, filed 2024-06, 50,300 miles

“The front passenger door lock actuator does not work properly causing the door to stay locked or unlocked despite attempts to change the door lock through the internal power locking system or remote key. This presents a safety issue in that it requires a manual lock/unlocking of the door should an emergency situation arise and expeditious ingress or egress from the vehicle be required. The door actuator is presently working intermittently and appears likely to fail permanently in the near future.”

NHTSA complaint #11764560, filed 2026-09

“FAILURE: Blind spot monitor module failed due to a corroded internal electrical connector. The failure disabled both the Blind Spot Monitor (BSM) and Rear Cross-Traffic Alert (RCTA). Both remain inoperative. The failed component has not been replaced and is available for inspection. SAFETY RISK: Two active safety systems are disabled. The vehicle no longer warns of vehicles in the blind spot during lane changes, and no longer warns of cross traffic when backing out of parking spaces or driveways. WARNING LAMPS: Yes. …”

NHTSA complaint #11750096, filed 2026-07

“Unexpected failure of the acceleration pedal to accelerate from a complete stop to a go at an intersection. The electric vehicle (EV) motor began accelerating up to about 3 mph than instantly had a failure to accelerate, even with the gas pedal continuously pushed to the floor. After about 4 to 5 seconds the engine kicked on and began accelerating. The failure seemed to occur during the EV motor swapping over to the gas powered engine. This has been the fourth occurrence and can be extremely dangerous at intersections with oncoming traffic. No fault codes or check engine lights came on.”

NHTSA complaint #11746943, filed 2026-06

Related service bulletins

Electrical system: other model years

YearComplaintsShare of year
202531%
202411%
2023811%
2022314%
202149%

Other parts of the 2021 Toyota Sienna Hybrid

Air bags
13 complaintsBrakes
9 complaintsSeats
5 complaintsBody and structure
5 complaintsVisibility (wipers, defrost, mirrors)
5 complaintsEngine
3 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