AutoUtility currently tracks 37 official NHTSA owner defect complaints for the 2021 Toyota Sienna. Air Bags & Restraints issues are the most frequently reported category, appearing in 12 complaints (32.4% of submitted records). Among these NHTSA complaint records, 1 cites a fire, 1 reports one or more injuries.
Factual proportion of owner complaints categorized by automotive subsystem in NHTSA records
12 owner complaints submitted to NHTSA ODI for this subsystem.
6 owner complaints submitted to NHTSA ODI for this subsystem.
5 owner complaints submitted to NHTSA ODI for this subsystem.
4 owner complaints submitted to NHTSA ODI for this subsystem.
Formal engineering analyses and preliminary evaluations opened by the NHTSA Office of Defects Investigation
Representative defect filings submitted by owners to the NHTSA Office of Defects Investigation
"Vehicle safety SOS button is not functioning properly. When the SOS button is depressed in case of emergency, the vehicle notifies user at the emergency system is un operational. Toyota includes this for 10 years from the date purchase and my vehicle is a 2021 making this feature active till 2031...."
"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:..."
"FAILURE: Brake control system. Vehicle intermittently surges forward while braking at low speed, most often through a curve — the brakes momentarily release and the vehicle lurches before braking resumes. Appears to occur during the transition between regenerative and friction braking. Vehicle..."
"Car surged as brakes were applied when stopping. Very dangerous. Could have easily rear-ended another vehicle. Surge was immediate and occurred when brake was being applied. Not confirmed yet, but another driver of vehicle told me of having similar problems when braking this car. Very scary. No..."
"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..."
Reported defect complaint volume across sibling model years (2015–2026)
| Model Year | NHTSA Complaints | Crash Reports | Safety Recalls | Detailed Report |
|---|---|---|---|---|
| 2015 Toyota Sienna | 230 | 17 | 6 | View 2015 Problems → |
| 2016 Toyota Sienna | 75 | 7 | 5 | View 2016 Problems → |
| 2017 Toyota Sienna | 152 | 13 | 10 | View 2017 Problems → |
| 2018 Toyota Sienna | 69 | 5 | 7 | View 2018 Problems → |
| 2019 Toyota Sienna | 45 | 2 | 7 | View 2019 Problems → |
| 2020 Toyota Sienna | 37 | 0 | 2 | View 2020 Problems → |
| 2021 Toyota Sienna Current Page | 37 | 0 | 4 | Current |
| 2022 Toyota Sienna | 15 | 1 | 4 | View 2022 Problems → |
| 2023 Toyota Sienna | 66 | 8 | 2 | View 2023 Problems → |
| 2024 Toyota Sienna | 65 | 5 | 3 | View 2024 Problems → |
| 2025 Toyota Sienna | 264 | 2 | 5 | View 2025 Problems → |
| 2026 Toyota Sienna | 0 | 0 | 0 | View 2026 Problems → |
Complete distribution of consumer defect reports across all 18 granular NHTSA system and subsystem classifications
| Vehicle Component / System | Total Complaints | Crash Reports | Fire Reports | Injury Entries | Fatality Entries |
|---|---|---|---|---|---|
| Air Bags NHTSA category: AIR BAGS | 12 | 0 | 0 | 0 | 0 |
| Service Brakes NHTSA category: SERVICE BRAKES | 3 | 0 | 0 | 0 | 0 |
| Visibility & Wipers NHTSA category: VISIBILITY/WIPER | 3 | 0 | 0 | 0 | 0 |
| Engine NHTSA category: ENGINE | 2 | 0 | 1 | 0 | 0 |
| Seats & Restraints NHTSA category: SEATS | 2 | 0 | 0 | 0 | 0 |
| Structure & Body NHTSA category: STRUCTURE | 2 | 0 | 0 | 0 | 0 |
| Other / Uncategorized NHTSA category: UNKNOWN OR OTHER | 2 | 0 | 0 | 0 | 0 |
| Electrical System NHTSA category: ELECTRICAL SYSTEM | 1 | 0 | 0 | 0 | 0 |
| ELECTRICAL SYSTEM,LANE DEPARTURE,BACK OVER PREVENTION | 1 | 0 | 0 | 0 | 0 |
| EXTERIOR LIGHTING,SERVICE BRAKES,VISIBILITY/WIPER | 1 | 0 | 0 | 0 | 0 |
| EXTERIOR LIGHTING,STRUCTURE,SEATS | 1 | 0 | 0 | 1 | 0 |
| POWER TRAIN,ELECTRICAL SYSTEM,FUEL/PROPULSION SYSTEM | 1 | 0 | 0 | 0 | 0 |
| POWER TRAIN,SERVICE BRAKES,FORWARD COLLISION AVOIDANCE | 1 | 0 | 0 | 0 | 0 |
| Service Brakes NHTSA category: SERVICE BRAKES, HYDRAULIC | 1 | 0 | 0 | 0 | 0 |
| Suspension NHTSA category: SUSPENSION | 1 | 0 | 0 | 0 | 0 |
| SUSPENSION,UNKNOWN OR OTHER,ENGINE | 1 | 0 | 0 | 0 | 0 |
| Tires NHTSA category: TIRES | 1 | 0 | 0 | 0 | 0 |
| VISIBILITY,LATCHES/LOCKS/LINKAGES | 1 | 0 | 0 | 0 | 0 |
Cross-reference safety recalls, crash test safety ratings, and EPA fuel economy for this model year
Key performance indicators, EPA fuel economy specs, powertrain variants, and summary ratings.
Official recall campaigns, safety defect descriptions, and manufacturer free remedy instructions.
NHTSA 5-Star NCAP crash test results, driver assistance systems, and rollover resistance ratings.
EPA fuel economy ratings, electric range, and annual energy cost benchmarks.
Direct, deterministic answers synthesized from verified United States government databases for the 2021 Toyota Sienna
In official NHTSA consumer records, the most frequently cited issue area for the 2021 Toyota Sienna is Air Bags & Restraints, appearing in 12 records (32.4% of submitted filings).
Secondary reported categories include Brakes & Traction Control (6) and Visibility, Wipers & Glass (5).
AutoUtility does not issue subjective reliability scores or commercial ratings. In official United States government records, NHTSA tracks 37 consumer defect complaints and 4 safety recall campaigns for the 2021 Toyota Sienna.
Reviewing documented component complaint distributions, recall remedy notices, and active federal investigations provides an objective, evidence-based view of the vehicle's historical safety and defect record.
Among consumer complaint records on file with NHTSA for the 2021 Toyota Sienna, 0 filings cite a crash, 1 cite smoke or fire, and 1 report one or more injuries.
Incident entries represent consumer descriptions at the time of submission to federal authorities and do not establish mechanical causation or legal liability.
NHTSA ODI records list 1 formal defect investigation involving the 2021 Toyota Sienna (all closed).
Federal defect investigations are formal engineering evaluations opened when safety defect trends emerge, and do not by themselves establish a confirmed defect or mandatory recall.
The complaint records on this page are retrieved directly from the NHTSA Office of Defects Investigation (ODI) public database under 49 CFR Part 576.
Local Production Store Compiled: August 2026 • Deterministic Audited Dataset • Zero Dynamic External API Runtime Latency.