Problems · NHTSA complaints

2021 Toyota Sienna Hybrid problems

Owners filed 45 complaints about the 2021 Toyota Sienna Hybrid with NHTSA between Dec 2020 and Oct 2026. The most-cited component is air bags (13).

Complaints
45
Filed with NHTSA
Crashes
0
Reported by owners
Fires
1
Reported by owners
Injuries
1
People reported injured
Deaths
0
Reported to NHTSA
01 —By component

Complaints by component

One complaint can cite several components
  1. Air bags13
  2. Service brakes8
  3. Structure5
  4. Seats5
  5. Electrical system4
  6. Visibility/wiper4
  7. Engine3
  8. Power train2
  9. Suspension2
  10. Exterior lighting2
  11. Lane departure1
  12. Back over prevention1
  13. Fuel/propulsion system1
  14. Forward collision avoidance1

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.

Data from NHTSA Complaints API · synced Nov 11, 2026NHTSA vehicle page
02 —Trend

When complaints were filed

Does it get worse with age? Complaints per calendar year filed
View as table
Model yearComplaints filed per calendar year
20201
20215
20221
20232
20249
20256
202621

Mileage at failure isn’t a structured field in NHTSA complaint data, so we don’t chart it. Some owners mention it in their reports below.

03 —Owner reports

Top problems in owners’ words

Verbatim from NHTSA complaints, newest first

Air bags

13 reports1 related recall
“SRS light has been showing up on the dashboard, off and on for 3 weeks. Diagnostic reader completed by the dealership states it is an airbag module malfunction of the 2nd row left passenger seat. The seat has never been removed, there have been zero accidents and no damage to the seat or wiring.”
Owner complaint to NHTSAFiled May 30, 2026Air bagsODI 11740978

Service brakes

8 reports
“This is a supplemental correction to my NHTSA complaint #XXX (2021 Toyota Sienna Hybrid, VIN [XXX]). The description of the brake defect itself is unchanged; I am correcting the service-history details. First dealer visit: the correct date is XXX, at approximately 41,192 miles, Repair Order #XXX, at Checkered Flag Toyota of [XXX]. I reported that when braking downhill, the vehicle seemed to speed up rather than slow down, as if something were pushing it forward. The service record states "No Work Performed – Customer Requested Return of Vehicle." No diagnosis or corrective action for the braking concern is documented. Second dealer visit: the visit spanned XXX, at approximately 55,637 miles, Repair Order #XXX, at the same dealership. I reported the vehicle lurching forward when attempting to stop and engine RPM increasing when the vehicle should have been slowing down. The technician's notes indicate the technician felt a small lurch when braking and noted an RPM abnormality — the concern was partially reproduced, not entirely unreproducible as my original complaint stated. The dealer reprogrammed the Brake ECU under Toyota TSB T-SB-0047-24. The problem…”
Owner complaint to NHTSAFiled Oct 9, 2026Service brakesODI 11770245

Structure

5 reports
“The rear power liftgate hinges on my 2021 Toyota Sienna failed structurally under normal, everyday operation. The power liftgate motor and struts appear to exert uneven or excessive pressure on the rear hatch assembly, causing the metal hinges to crack. Before the failure, we noticed a loud popping/grinding sound when opening the hatch, which quickly progressed to the liftgate binding and misaligning. This is a severe safety hazard because the structural failure prevents the heavy rear hatch from closing or latching securely, creating a risk that it could fly open while driving, dropping cargo onto the roadway or exposing passengers. It also creates a risk of the heavy door falling unexpectedly on someone loading the vehicle. The vehicle had to be taken to a dealership body shop for structural repairs due to the cracked metal, costing me over $1,500 out of pocket. Toyota has not issued a recall or good faith reimbursment for this known design defect.”
Owner complaint to NHTSAFiled Sep 10, 2026StructureODI 11763294

Seats

5 reports1 related recall
“brake sleeps sometime when i press brake pedal i took car to dealer once,they said need time i did not have much time took another time, they reseted system still... my warranty is over now. rear seat,make shake noise and check rear seat sign on dealer can't find problem. did not do anything since new car. i do not know any other 2021 sienna drivers have same problem.”
Owner complaint to NHTSAFiled Sep 5, 2026Seats, Service brakesODI 11762371

Electrical system

4 reports
“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.”
Owner complaint to NHTSAFiled Sep 15, 2026Electrical systemODI 11764560

Visibility/wiper

4 reports
“THE 2021 SIENNA XLE PLUS AND ENTERTAINMENT PACKAGE DID NOT INCLUDE A DIGITAL REAR VIEW MIRROR IN THIS TRIM LEVEL. THE NEW SIENNA IS A BRAND NEW MODEL WITH A MASSIVE DESIGN FLAW, A HUGE TV WITH ZERO VISIBILITY OUT THE REAR OF CAR. IT'S UNSAFE. MANY PEOPLE WILL NOT TEST DRIVE WITH THE TV DOWN TO SEE THE SAFETY ISSUE. WE DIDN'T REALIZE IT TILL KIDS PUT THE TV DOWN DAY LATER. SEEMS TO HAVE SADLY MADE IT THROUGH QUALITY CONTROL PROCESS AT TOYOTA. YOU CAN NOT SEE CARS RIGHT UP ON YOU AT STOP SIGNS, CARS APPROACHING ETC IT NEEDS A SAFETY RECALL AND A MODIFICATION.WE HAVE HAD CAR FOR 3 WEEKS.”
Owner complaint to NHTSAFiled Apr 29, 2021Visibility/wiperODI 11414500
Data from NHTSA Complaints API (owner reports, unverified) · synced Nov 11, 2026

Complaints are unverified owner reports to NHTSA and are not normalized for sales volume. One complaint can cite several components.