The cleanest fourth-generation year on paper — two recalls, one nagging brake habit, and glass that sometimes lets go.

The second cluster on this year and it is unnerving rather than expensive. Owners report the panoramic roof glass and the rear windscreen breaking with nothing striking them. One filing describes driving on a motorway with small children in the back when 'a loud pop sounded and glass from the moon roof came shattering down upon us', hitting the driver's face, arms and hair; she was able to exit safely and the children were not struck. Similar reports appear on the neighbouring model years, including a rear windscreen that shattered in a driveway with a security camera confirming nobody was near the van. There is no recall and no Toyota bulletin for this. Practically: check the roof and rear glass for chips and stress marks before you buy, and if you are buying used, ask whether either has been replaced and why. Comprehensive insurance covers glass; the shock in a van full of children is the real cost.

One of only two recalls on this year, and the only Toyota one. It covers 2021–2025 Sienna Hybrids: 'The bolts for the seatbacks on the third-row seat assemblies may not be tightened properly.' Toyota lists it as failing three federal safety standards — head restraints, seating systems, and child restraint anchorages. That third one is why a bolt-tightening recall matters more in a minivan than it would elsewhere: it governs the anchor points a child seat clips into. Dealers tighten the bolts free (Toyota code 25TA05) and owner letters were mailed on 1 April 2025. The remedy addresses the third row only, so if a van has a rattle from the second row, this recall will not resolve it.

A Customer Support Program rather than a recall — quiet extended coverage that sits outside the ordinary warranty, so it does not appear in a VIN recall search and you have to ask a Toyota dealer for it by name. Toyota's wording: coverage 'for repairs related to excessive corrosion to the wire harness connections at the Rear Motor Generator. Excessive corrosion can cause AM Radio Static during certain drive cycles, or the vehicle may not start.' On an all-wheel-drive Sienna the rear wheels are driven by an electric motor, and this covers the high-voltage floor harness and rear traction motor cable feeding it. The symptom is odd enough to be easy to miss: crackling on the AM band while driving. On coverage, read Toyota's line carefully — the bulletin states these parts are covered by the New Vehicle Limited Warranty for three years or 36,000 miles, but that is the ordinary factory warranty, not the program, and the program's own window is not stated in the bulletin summary. Verify the terms in the bulletin PDF and have a dealer check the VIN. Toyota's own technical instructions give different year spans in different revisions — one says 2021–2022, a later one says 2021–2024 — and one related bulletin in the set carries an obsolescence notice dated February 2026, all of which is a reason to check by VIN rather than by model year. Salt-belt vans carry the exposure.

Two independent sources give this generation an unusually clean bill of health, and they are worth stating plainly because the complaint file alone can read harsher than the van deserves. An instrumented 40,000-mile long-term test in our sources logged exactly one unscheduled repair over the whole distance — a sensor cover, replaced under warranty — alongside eight routine service visits at 5,000-mile intervals, the first five free under Toyota's included maintenance and the rest around $100 each. Their only standing complaint is behavioural: the rear collision-avoidance system braking hard whenever it senses anything behind the van while reversing. Separately, the independent Toyota mechanic in our sources emphasises that nothing in the drivetrain was new at launch — the 2.5-litre A25A-FXS engine came from the 2018 Camry, the hybrid electronics from the 2016 Prius generation, the P810 transaxle from the Highlander Hybrid and RAV4 Prime — and his only reason to tell someone not to buy this van is power, not reliability: 'if you have a heavy foot and you're expecting the same power level as a V6, well, it's just not there.'

Three quirks of this van worth knowing before you commit. There is no spare wheel under the floor — a spare was a low-cost dealer option, so look in the load area to see whether the van you are buying has one, or you are relying on an inflator kit. The third-row seat cannot be removed, because it contains an airbag; it folds and slides forward, but this is not the old Sienna where the seats came out. And the hybrid system has a cooling-fan filter that our mechanic source calls an important maintenance item — most owners have never heard of it, so ask whether it has been serviced. One more from this year's file that is not Toyota's fault but is a minivan buyer's problem: a third-party BraunAbility wheelchair seat system installed by a mobility dealer seized mid-cycle and trapped a disabled passenger. If the van has aftermarket mobility equipment, that equipment has its own service history and its own recalls, separate from Toyota's.