AutoUtility currently tracks 69 official NHTSA owner defect complaints for the 2018 Toyota Sienna. Powertrain & Transmission issues are the most frequently reported category, appearing in 18 complaints (26.1% of submitted records). Among these NHTSA complaint records, 5 filings cite a crash, 3 report one or more injuries.
- • Total NHTSA Complaints: 69 reports
- • #1 Reported Problem Area: Powertrain & Transmission (18 reports • 26.1% of submitted complaints)
- • Secondary Problem Areas: Fuel & Propulsion System (13), Electrical System (6)
- • Crash-Citing Complaints: 5 filings
- • Fire-Citing Complaints: 0 filings
- • Complaints Reporting Injuries / Fatalities: 3 injury filings • 0 fatality filings
Most Reported Problems for 2018 Toyota Sienna
Top automotive subsystem defect categories ranked by unique owner complaint volume in federal records
Powertrain & Transmission
Fuel & Propulsion System
NHTSA records list 2 official safety recall campaigns for this model year involving the same broad component area:
- Campaign #20V012000 FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
- Campaign #20V682000 FUEL SYSTEM, GASOLINE:DELIVERY:FUEL PUMP
Electrical System
Air Bags & Restraints
Body & Structure
Recent NHTSA Owner Reports for 2018 Toyota Sienna
Representative defect filings submitted by owners to the NHTSA Office of Defects Investigation
"Vehicle: 2018 Toyota Sienna XLE AWD, VIN [XXX], approximately 112,000 miles. Component: Power Train / Automatic Transmission (UA80F 8-speed). The vehicle has developed a pronounced whining noise from the transmission that rises with road speed, accompanied by harsh/rough shifting. A Toyota dealer..."
"Since owning my 2018 Toyota Sienna, I have experienced hesitation and erratic shifting with my transmission. I have the UA80E transmission which upon research others are experiencing issues with as well. It appears Toyota is not fully acknowledging the problem. The problem is a safety issue as..."
"My 2018 Sienna had developed a whining noise when accelerating. After taking it in to the mechanic, they advised the transmission was failing. Estimated price tag of $6500-7000 to repair. The vehicle has less than 140K miles. Looking at different issues with this make/model and year, it seems like..."
"The contact owns a 2018 Toyota Sienna. The contact stated that while driving 30 MPH and ascending a hill, the vehicle started making an abnormal whining sound and hesitated while accelerating. The vehicle was driven to the dealer to be diagnosed. The vehicle was diagnosed with transmission failure...."
"Transmission has been whining. A P27137F Code appeared and the vehicle is only in 2WD mode currently. Concerned to drive vehicle due to further damaging transmission or getting stuck while on the road."
Complaint History for Toyota Sienna
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 Current Page | 69 | 5 | 7 | Current |
| 2019 Toyota Sienna | 45 | 2 | 7 | View 2019 Problems → |
| 2020 Toyota Sienna | 37 | 0 | 2 | View 2020 Problems → |
| 2021 Toyota Sienna | 37 | 0 | 4 | View 2021 Problems → |
| 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 → |
Detailed NHTSA Component Breakdown for 2018 Toyota Sienna
Complete distribution of consumer defect reports across all 29 granular NHTSA system and subsystem classifications
| Vehicle Component / System | Total Complaints | Crash Reports | Fire Reports | Reported Injury Entries | Reported Fatality Entries |
|---|---|---|---|---|---|
| Powertrain NHTSA category: POWER TRAIN | 13 | 0 | 0 | 0 | 0 |
| Other / Uncategorized NHTSA category: UNKNOWN OR OTHER | 10 | 0 | 0 | 1 | 0 |
| Fuel & Propulsion System NHTSA category: FUEL/PROPULSION SYSTEM | 7 | 0 | 0 | 0 | 0 |
| Air Bags NHTSA category: AIR BAGS | 4 | 4 | 0 | 5 | 0 |
| Fuel System NHTSA category: FUEL SYSTEM, GASOLINE | 4 | 0 | 0 | 0 | 0 |
| Electrical System NHTSA category: ELECTRICAL SYSTEM | 3 | 0 | 0 | 0 | 0 |
| Structure & Body NHTSA category: STRUCTURE | 3 | 0 | 0 | 0 | 0 |
| Engine NHTSA category: ENGINE | 2 | 0 | 0 | 0 | 0 |
| POWER TRAIN,VEHICLE SPEED CONTROL | 2 | 0 | 0 | 0 | 0 |
| Seats & Restraints NHTSA category: SEATS | 2 | 0 | 0 | 0 | 0 |
| CHILD SEAT | 1 | 0 | 0 | 0 | 0 |
| ELECTRICAL SYSTEM,AIR BAGS,ENGINE | 1 | 0 | 0 | 0 | 0 |
| ELECTRICAL SYSTEM,SEATS | 1 | 0 | 0 | 0 | 0 |
| ELECTRICAL SYSTEM,UNKNOWN OR OTHER | 1 | 0 | 0 | 0 | 0 |
| EQUIPMENT ADAPTIVE/MOBILITY | 1 | 0 | 0 | 0 | 0 |
| EXTERIOR LIGHTING,INTERIOR LIGHTING | 1 | 0 | 0 | 0 | 0 |
| POWER TRAIN,ENGINE | 1 | 0 | 0 | 0 | 0 |
| POWER TRAIN,STRUCTURE,SEATS | 1 | 0 | 0 | 0 | 0 |
| POWER TRAIN,VEHICLE SPEED CONTROL,SERVICE BRAKES | 1 | 0 | 0 | 0 | 0 |
| Service Brakes NHTSA category: SERVICE BRAKES | 1 | 0 | 0 | 0 | 0 |
| STRUCTURE,UNKNOWN OR OTHER | 1 | 0 | 0 | 0 | 0 |
| Suspension NHTSA category: SUSPENSION | 1 | 0 | 0 | 0 | 0 |
| Tires NHTSA category: TIRES | 1 | 0 | 0 | 0 | 0 |
| UNKNOWN OR OTHER,ENGINE,FUEL/PROPULSION SYSTEM | 1 | 0 | 0 | 0 | 0 |
| Vehicle Speed Control NHTSA category: VEHICLE SPEED CONTROL | 1 | 1 | 0 | 0 | 0 |
| VEHICLE SPEED CONTROL,FUEL/PROPULSION SYSTEM | 1 | 0 | 0 | 0 | 0 |
| Visibility / Glass NHTSA category: VISIBILITY | 1 | 0 | 0 | 0 | 0 |
| Visibility & Wipers NHTSA category: VISIBILITY/WIPER | 1 | 0 | 0 | 0 | 0 |
| Wheels & Hubs NHTSA category: WHEELS | 1 | 0 | 0 | 0 | 0 |
The complaint records on this page are retrieved directly from the NHTSA Office of Defects Investigation (ODI) public database.
Local Production Store Compiled: August 2026 • Deterministic Audited Dataset • Zero Dynamic External API Runtime Latency.