1998-2026 model years · 8,285+ owner reports · Updated September 2026
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According to Au7o's analysis of 8,285+ owner reports, the 1998-2026 Toyota Sienna has 32 documented known issues, with 10 rated critical. The most serious are Rear Coil Spring Fracture at Lower Coil from Corrosion ($400-$900 repair), Denso Low-Pressure Fuel Pump Failure Causing Engine Stall (Recall 20V-682 / 20TA02) ($0-$1,000 repair), U140E/U140F 4-Speed Automatic Slipping, Flare, and No-Movement from Valve Body Wear ($1,400-$3,800 repair), Spare Tire Carrier Cable Corrosion Causing Spare to Drop (Recalls 10V-160 and 14V-273) ($0-$0 repair), Third-Row Seatback Recliner Bolts Under-Torqued (Recall 25V-086 / 25TA05) ($0-$0 repair), Vehicle Stability Control Fails to Re-Enable After Restart (Recall 22V239 / 22TA03) ($0-$0 repair), 1MZ-FE 3.0L V6 Oil Gelling (Engine Sludge) from PCV/Oil-Return Restriction ($900-$5,500 repair), Occupant Classification System Sensor Short Circuit Disabling Front Passenger Airbag (Recall 23V865) ($0-$0 repair), UA80E 8-Speed Automatic Harsh Shifting, Whine, and Reduced Power (TSB 0160-18) ($0-$5,500 repair) and Stop Lamp Switch Bracket Damaged by Parking Brake Pedal Causing Brake Drag (Recall 10V620) ($0-$0 repair). The most commonly reported issue is Power Sliding Door Malfunction with 3,200 owner reports. Across all issues with published estimates, repair costs range from $50 to $7,000. DIY maintenance guides at au7o.io.
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According to Au7o's analysis of 8,285+ owner reports, the 1998-2026 Toyota Sienna has 32 documented issues. The most frequently reported are: Rear Coil Spring Fracture at Lower Coil from Corrosion, Denso Low-Pressure Fuel Pump Failure Causing Engine Stall (Recall 20V-682 / 20TA02), U140E/U140F 4-Speed Automatic Slipping, Flare, and No-Movement from Valve Body Wear. Of these, 10 are rated critical and should be addressed promptly.
The 1998-2026 Toyota Sienna has 32 known issues documented across 8,285+ owner reports. 10 issues are rated critical: Rear Coil Spring Fracture at Lower Coil from Corrosion and Denso Low-Pressure Fuel Pump Failure Causing Engine Stall (Recall 20V-682 / 20TA02) and U140E/U140F 4-Speed Automatic Slipping, Flare, and No-Movement from Valve Body Wear and Spare Tire Carrier Cable Corrosion Causing Spare to Drop (Recalls 10V-160 and 14V-273) and Third-Row Seatback Recliner Bolts Under-Torqued (Recall 25V-086 / 25TA05) and Vehicle Stability Control Fails to Re-Enable After Restart (Recall 22V239 / 22TA03) and 1MZ-FE 3.0L V6 Oil Gelling (Engine Sludge) from PCV/Oil-Return Restriction and Occupant Classification System Sensor Short Circuit Disabling Front Passenger Airbag (Recall 23V865) and UA80E 8-Speed Automatic Harsh Shifting, Whine, and Reduced Power (TSB 0160-18) and Stop Lamp Switch Bracket Damaged by Parking Brake Pedal Causing Brake Drag (Recall 10V620). Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.
Repair costs for known Toyota Sienna issues range from $0 to $7,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Rear Coil Spring Fracture at Lower Coil from Corrosion, typically costs $400-$900 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.
Reliability varies across model years of the Toyota Sienna. Based on documented issues, problems are most commonly reported in earlier model years. Au7o recommends checking the specific known issues for your target year before purchasing, and having a pre-purchase inspection performed by a qualified mechanic. Our known issues database covers the 1998-2026 Toyota Sienna with 32 documented issues documented across 8,285+ owner reports.
On second-generation (XL20) Siennas the rear coil springs corrode where the bottom coil sits in the lower spring seat, which traps road salt and moisture. The spring rusts through at that contact point and snaps, usually within the last coil. Independent Toyota shops in the salt… Repairs typically run $400-$900. Severity: high.
The Denso-built low-pressure (in-tank) fuel pump can fail without warning. The pump impeller was molded from a lower-density resin that absorbs fuel over time, swells, and binds against the pump housing, stopping the pump. This cuts fuel delivery and causes the engine to stall, o… Repairs typically run $0-$1,000. Severity: high.
The XL10 Sienna used the Aisin U140E (FWD) / U140F (AWD) four-speed automatic. On high-mileage vans the valve body bores and shift solenoids wear, line pressure falls off, and the transaxle first flares between gears, then slips, then loses forward movement entirely. Shift soleno… Repairs typically run $1,400-$3,800. Severity: high.
The underbody spare tire carrier on second-generation Siennas is exposed to road-salt spray because the water splash protector is inadequate. The steel hoist cable corrodes where it enters the carrier mechanism, and the cable can eventually fail and release the full-size spare ti… Repairs typically run $0-$0. Severity: high.
On roughly 168,000 fourth-generation Sienna Hybrids built from mid-October 2020 through late January 2025, the bolts that attach the split 60/40 third-row seat backs to the recliner assemblies were not tightened to specification during assembly. With low-torque bolts the seatback… Repairs typically run $0-$0. Severity: high.
Toyota recalled 2021-2022 Sienna Hybrid vehicles because of a Skid Control ECU software error: if the driver manually switches Vehicle Stability Control off, the software may fail to turn VSC back on when the vehicle is restarted. The van then drives with stability control silent… Repairs typically run $0-$0. Severity: high.
First-generation XL10 Siennas built with the 3.0L 1MZ-FE V6 are part of Toyota's well-documented oil-gelling population. Restricted crankcase ventilation and undersized oil drain-back passages let oil oxidize into a gel that blocks the pickup screen and oil galleries. Owners repo… Repairs typically run $900-$5,500. Severity: high.
Toyota recalled 2021 Sienna Hybrid vehicles because a sensor in the front passenger seat's Occupant Classification System can short circuit. The OCS is what tells the airbag control module whether an adult, a child, or nothing is in the front passenger seat and therefore whether… Repairs typically run $0-$0. Severity: high.
When the XL30 moved to the 2GR-FKS V6 and the UA80E eight-speed automatic for 2017, owners immediately reported harsh and delayed shifts, hesitation from a stop, lurching, jerking, and excessive revving before the transaxle would upshift. A distinct and more serious variant is a… Repairs typically run $0-$5,500. Severity: high.
On early XL30 Siennas the stop lamp switch is mounted on a small welded bracket on the left side of the brake pedal support assembly, immediately adjacent to the parking brake pedal. Toyota determined that a driver's foot could strike and deform the bracket while applying the par… Repairs typically run $0-$0. Severity: high.
Power sliding doors on 2nd and 3rd gen Siennas are prone to cable fraying, motor failure, and latch mechanism issues. Doors may refuse to open/close, reverse mid-travel, or make grinding noises. The cable assembly inside the door wears and eventually snaps. Repairs typically run $400-$1,500. Severity: medium.
2nd-gen Sienna dashboards are notorious for cracking, warping, and developing a sticky/melting surface, especially in hot climates. The dashboard material degrades from UV exposure and heat, creating a hazardous glare and releasing a sticky residue. Repairs typically run $0-$2,000. Severity: medium.
The 3.5L 2GR-FE V6 commonly develops oil leaks from the VVT-i oil line, timing cover, and valve cover gaskets. The VVT-i oil hose fitting loosens over time, dripping oil onto the exhaust manifold creating a burning smell and fire risk. Repairs typically run $50-$800. Severity: medium.
The 3.5L 2GR-FE V6 in 2nd and 3rd generation Siennas can consume 1 quart of oil every 2,000-3,000 miles. Worn piston rings and valve stem seals are the primary causes. The issue is more prevalent in vehicles driven primarily in city stop-and-go conditions where the engine rarely… Repairs typically run $200-$3,800. Severity: medium.
The front AC evaporator core in 3rd generation Siennas develops pinhole leaks from internal corrosion, causing gradual refrigerant loss. The AC system blows warm air intermittently, then fails completely. The rear AC system (if equipped) has a separate evaporator that can also fa… Repairs typically run $800-$2,200. Severity: medium.
Fourth-generation Sienna Hybrids blend regenerative braking with friction braking, and the handoff between the two is not transparent. Under gradual deceleration - typically at low speed, on downgrades, or over a bump while braking - the van momentarily lurches forward as though… Repairs typically run $0-$200. Severity: medium.
Fourth-generation Sienna Hybrids repeatedly go dead at the 12V auxiliary battery, sometimes on nearly new vans. The 12V battery is only replenished by the DC-DC converter while the vehicle is in READY, so anything that keeps drawing after shutdown flattens it over a few days of l… Repairs typically run $250-$700. Severity: medium.
The lower sliding-door rail and the seam where the rocker panel meets the sill trap salt, grit and water on Siennas run in the salt belt. Rust starts inside the lower door track and in the rocker seam under the sliding doors, then perforates outward and can eat into the structura… Repairs typically run $300-$2,500. Severity: medium.
Front wheel bearings are a high-frequency wear item on the XL20 Sienna, which carries substantial front axle weight. The failure presents as a droning or humming that rises with road speed and changes character when the van is steered - loading the opposite side quiets a bad bear… Repairs typically run $180-$600. Severity: medium.
XL20 Siennas develop a distinct shudder - felt as a rumble-strip vibration through the floor - under very light throttle at low RPM, typically below about 2,000 RPM while holding speed or climbing a gentle grade. It disappears the moment the transaxle downshifts or RPM rises. The… Repairs typically run $150-$2,200. Severity: medium.
Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.
