2018 Toyota SIENNA problems and owner complaints
Explore the records behind recurring owner reports.
Key facts
70 owner complaints analyzed
7 distinct recall campaigns
29,000 mi median reported failure mileage
Scope: 2018 model year. Data snapshot: . 38 complaints include usable failure mileage.
Most common problems
Power Train is the most frequently named component, appearing in 18 of 70 complaints (25.7%). A complaint can name multiple components.
| Topic | Matching reports | Share of complaints |
|---|---|---|
| Transmission and shifting | 13 | 18.6% |
| Fuel system concerns | 6 | 8.6% |
| Engine operation | 4 | 5.7% |
| Braking behavior | 3 | 4.3% |
| Electrical and battery issues | 1 | 1.4% |
Topic matches use published keyword rules. They describe mentions, including negations or comparisons, and do not confirm a diagnosis. Read the matching rules.
Component breakdown
Number of unique complaints naming each component. Top eight shown.
| Category | Count |
|---|---|
| Power Train | 18 |
| Unknown Or Other | 13 |
| Fuel/Propulsion System | 9 |
| Electrical System | 5 |
| Engine | 5 |
| Structure:Body | 5 |
| Vehicle Speed Control | 5 |
| Air Bags | 4 |
Power Train: 18; Unknown Or Other: 13; Fuel/Propulsion System: 9; Electrical System: 5; Engine: 5; Structure:Body: 5; Vehicle Speed Control: 5; Air Bags: 4
Reported problems by failure mileage
Complaint counts in mileage bands. These are not failure rates per vehicle or mile.
| Category | Count |
|---|---|
| Under 25,000 | 18 |
| 25,000 to 49,999 | 8 |
| 50,000 to 74,999 | 7 |
| 75,000 to 99,999 | 0 |
| 100,000 to 149,999 | 3 |
| 150,000 and above | 2 |
Under 25,000: 18; 25,000 to 49,999: 8; 50,000 to 74,999: 7; 75,000 to 99,999: 0; 100,000 to 149,999: 3; 150,000 and above: 2
Under 25,000 miles has the most reports with usable mileage (18). 32 complaints have missing, zero or invalid mileage.
Complaints over time
Year the complaint was filed, not the vehicle model year or incident year. The snapshot year is partial.
| Category | Count |
|---|---|
| 2018 | 9 |
| 2019 | 8 |
| 2020 | 18 |
| 2021 | 9 |
| 2022 | 3 |
| 2023 | 4 |
| 2024 | 7 |
| 2025 | 5 |
| 2026 | 7 |
2018: 9; 2019: 8; 2020: 18; 2021: 9; 2022: 3; 2023: 4; 2024: 7; 2025: 5; 2026: 7
Pattern summary
Power Train leads the component reports. Transmission and shifting appears in 13 complaint narratives. Fuel system concerns appears in 6 complaint narratives. Engine operation appears in 4 complaint narratives. Use these patterns to inspect individual reports and prepare questions for a mechanic.
Calculated from recorded counts. An AI narrative has not been published for this selection.
Complaint evidence
Examples provide context, not a representative sample or a verified diagnosis.
Owner report 11175491 · 2019-02-25 (February 25, 2019)
2018 TOYOTA SIENNA LE. CONSUMER WRITES IN REGARD TO DELAYED ACCELERATION WHICH IS CAUSING TRANSMISSION DAMAGE. *AS *TR
Owner-reported narrative. Look up ODI 11175491 at NHTSA ↗
Owner report 11398235 · 2021-02-27 (February 27, 2021)
I HAD TORQUE CONVERTER CLUTCH PRESSURE CONTROL SOLENOID CONTROL CIRCUIT AND WHEN I RICH 85 SPEED THE CAR CHECK AND MY FRIEND HAVE THE SAME CAR SAM MODEL HE HAD THE SAME ISSUE
Owner-reported narrative. 65,000 miles reported. Look up ODI 11398235 at NHTSA ↗
Owner report 11324023 · 2020-05-10 (May 10, 2020)
WE RECEIVED NOTICE FROM TOYOTA OF A POSSIBLE FAILURE IN THE VEHICLE'S FUEL PUMP FOR WHICH THERE IS NO CURRENT FIX AVAILABLE. THE VEHICLE IS PARKED IN THE GARAGE. NOTHING HAPPENED. MY CONCERN IS THAT THERE'S NO DATA AVAILABLE ABOUT THE FREQUENCY OF THESE FAILURES, SO IT'S IMPOSSIBLE FOR ME TO ASSESS THE RISK OF DRIVING OUR ONLY CAR. *TR
Owner-reported narrative. Look up ODI 11324023 at NHTSA ↗
Owner report 11331502 · 2020-06-29 (June 29, 2020)
TL* THE CONTACT OWNS A 2018 TOYOTA SIENNA. THE CONTACT STATED THAT WHILE DRIVING APPROXIMATELY 20 MPH, THE MASTER WARNING LIGHT ILLUMINATED AND THE VEHICLE STALLED. THE CAUSE OF THE FAILURE WAS NOT DETERMINED. AN UNKNOWN DEALER WAS NOTIFIED OF THE FAILURE. THE MANUFACTURER WAS NOT NOTIFIED. THE CONTACT WAS INFORMED THAT THE VIN WAS INCLUDED IN THE NHTSA CAMPAIGN NUMBER: 20V012000 (ELECTRICAL SYSTEM) HOWEVER, THE PART TO DO THE RECALL REPAIR WAS NOT YET AVAILABLE. THE CONTACT STATED THAT THE MANUFACTURER HAD EXCEEDED A REASONABLE AMOUNT OF TIME …
Owner-reported narrative. 56,000 miles reported. Look up ODI 11331502 at NHTSA ↗
Owner report 11152940 · 2018-11-20 (November 20, 2018)
1. EVEN TO GO ON A SMALL UPHILL SLOPE, THE VEHICLE(V6) REALLY STRUGGLES. AND WHEN I TRY TO ACCELERATE, IT KIND OF STALLS OR SLOWS DOWN FOR A MOMENT, THEN TRIES TO SPEED UP BUT ITS STILL VERY SLOW. I'M FACING THIS ISSUE EVERY DAY. MY OTHER CAR 2011 CAMRY(V4) IS VERY SMOOTH AT THE EXACT SAME PLACES. CANT BELIEVE THE PICKUP IS THIS POOR WITH A NEW CAR. 2. ON HIGHWAYS, JUST TO MAINTAIN THE SPEED OVER 65 MPH ON A RECENT TRIP, I HAD TO PRESS REAL HARD ON GAS THE WHOLE TIME, EVEN AFTER THAT, I CAN CLEARLY TELL THE VEHICLE WAS WORKING EXTRA HARD JUS…
Owner-reported narrative. 1,200 miles reported. Look up ODI 11152940 at NHTSA ↗
Owner report 11123640 · 2018-08-31 (August 31, 2018)
TL* THE CONTACT OWNS A 2018 TOYOTA SIENNA. THE CONTACT STATED THAT THE CARPET ON THE DRIVER SIDE NEAR THE ACCELERATOR AND BRAKE PEDALS WAS LOOSE AND MADE CONTACT WITH THE DRIVER'S FOOT WHILE DRIVING. THE VEHICLE WAS TAKEN TO CAIN TOYOTA (6527 WHIPPLE AVE NW, NORTH CANTON, OH), BUT THE FAILURE WAS NOT REPAIRED. THE MANUFACTURER WAS NOTIFIED OF THE FAILURE. THE FAILURE MILEAGE WAS 4,700.
Owner-reported narrative. 4,700 miles reported. Look up ODI 11123640 at NHTSA ↗
Owner report 11184028 · 2019-03-04 (March 4, 2019)
TL* THE CONTACT OWNS A 2018 TOYOTA SIENNA. WHILE DRIVING APPROXIMATELY 45-50 MPH, THE ACCELERATOR PEDAL WAS DEPRESSED, BUT FAILED TO RESPOND. ADDITIONALLY, THE VEHICLE DECELERATED INDEPENDENTLY ON OCCASION. THE VEHICLE WAS NOT DIAGNOSED OR REPAIRED. LARRY H MILLER TOYOTA COLORADO SPRINGS (LOCATED AT 5115 NEW CAR DR, COLORADO SPRINGS, CO 80923, [phone removed]) WAS NOTIFIED OF THE FAILURE. THE CONTACT STATED THAT THE FAILURE RECURRED ON SEVERAL OCCASIONS. THE MANUFACTURER WAS NOT CONTACTED. THE APPROXIMATE FAILURE MILEAGE WAS 10,000. THE CON…
Owner-reported narrative. 10,000 miles reported. Look up ODI 11184028 at NHTSA ↗