When it comes to reliably hauling families around, the Toyota Sienna has been the gold standard for decades. When the fourth-generation Sienna was introduced in 2021, it brought a standard hybrid drivetrain along with a new overall design. Even more interesting was the availability of all-wheel drive via a rear electric drive motor. Now buyers could benefit from both impressive hauling capacity and outstanding fuel economy. But even legendary Toyota quality sometimes slips, and the 2021-2026 Toyota Sienna is no different.
The information presented below was collected from NHTSA.gov complaints, recall information, various Facebook groups and online forums plus experience from covering the industry for the last 15 years.
Loose Seat Bolts
Certain 2021–2025 Toyota Sienna vans are covered by recall 25V-086 because bolts connecting the split third-row seatbacks to their recliner assemblies may not have been tightened to specification. That can compromise seat performance in a crash. Dealers tighten the affected bolts to the proper specification free of charge.
A separate recall announced in October 2025 covers certain 2025 Siennas with improperly welded second-row seat rails. Dealers replace the affected rails free of charge. These are different campaigns, so check the VIN for both.
Sliding Door Issues
Power sliding doors on minivans are awesome, especially ones that can be opened remotely. But when those doors don’t want to open or close, things go downhill in a hurry. Sometimes the issue is operator error, as the power door disable button is pretty easy to bump by accident. Safety sensors keep the doors from closing on anyone by accident, but sometimes those same sensors can prevent the door from closing fully as one Reddit user found. Another Reddit user found an issue with the door latch mechanism itself. There isn’t any one “smoking gun” problem with the sliding doors, but they are complicated and thus can be expensive to diagnose.
Braking Transition Complaints
Some owners describe a brief change in deceleration or a forward-lurch sensation while braking. Such complaints should be taken seriously, but a complaint alone does not establish the cause or prove unintended engine acceleration.
Toyota bulletin T-SB-0047-24 addresses the transition between regenerative and hydraulic braking on 2021–2024 Sienna Hybrid models under certain conditions. It provides a brake actuator control-module update intended to improve brake feel. The bulletin is not a safety recall and does not establish that every braking complaint has the same cause.
Ask a Toyota dealer to diagnose unexpected braking behavior and check whether this update applies. The bulletin lists coverage under the basic warranty, subject to its time, mileage and condition requirements. Do not assume an out-of-warranty update is free or that a software update will resolve every brake problem.
AWD Rear Motor Wiring Harness Corrosion
On affected all-wheel-drive Siennas, corrosion at the high-voltage connection to the rear motor can cause AM radio static, warning messages or a no-start condition. Toyota’s Customer Support Program 22TE09 provides defined coverage for qualifying vehicles and conditions. This is a formal support program, not simply discretionary goodwill, and eligibility depends on the VIN and program terms. Ask the dealer to check both 22TE09 and related campaign 25TD01, including any requirements for extended coverage. High-voltage wiring should be inspected by a qualified technician.
Conclusion
The Sienna combines a four-cylinder hybrid powertrain with an electronically controlled continuously variable transmission, offering a practical family-hauling package. If you are shopping for a used 2021–2026 Sienna, check the NHTSA recall lookup tool for open campaigns and ask a Toyota dealer about applicable support programs and service updates. The issues described here affect specific model years and vehicles, not every Sienna in that range. An independent pre-purchase inspection and maintenance records are more useful than a shiny detail job alone.
