The 2006 Sienna's body has chronic structural problems that appear to be design defects rather than wear items. The power sliding doors are the biggest issue: hinges sag and fail, motors quit working, and cables fray or snap, leaving doors jammed halfway open or stuck shut. Owners describe paying $1,200-$1,800 per door for repairs, often after just 4-5 years of normal use. Many report the door won't close even manually once the motor fails, creating a genuine safety hazard—children can fall out, and emergency evacuation becomes difficult.
The rear liftgate struts fail completely on both powered and manual versions, causing the heavy door to drop without warning and injure occupants. Toyota recalled this for powered liftgates in 2008 but refuses to cover identical strut failures on non-powered versions, even though the part numbers are the same.
Front door hinges crack at the welds, producing loud popping sounds. Toyota issued a limited warranty extension (5 years/100,000 miles) that many owners never received notice of and that has long since expired. Rear quarter panels rust aggressively despite factory-applied protective strips. Manual sliding doors jam or refuse to open/close, and rear latch mechanisms fail to secure properly.
Owners consistently report Toyota denying coverage or responsibility for these problems, instead offering partial dealer assistance or pointing to expired warranty periods. Multiple owners found evidence of Technical Service Bulletins and recall campaigns, suggesting Toyota was aware of design problems.
Failure modes owners describe
Power sliding door motor and hinge failure
The power sliding doors fail due to motor malfunction and bent rear hinges, preventing the door from opening or closing properly. The center hinge sags and fails, causing the door to jam or become misaligned. Owners report the door getting stuck halfway, jamming at various positions, or refusing to move at all.
When: 2-14 years of ownership; often around 4-5 years or 50,000-70,000 miles, though some failures occur earlier. One case at 51,300 miles after 14 years of ownership.
Symptoms owners cite: Door jams at halfway point and returns to open position; Unusual grinding, rattling, or jerky sounds when operating; Door stops opening partway and automatically closes; Door will not open or close, even manually without considerable force; Center hinge sags and scrapes rear body panel; Door scrapes or catches on frame when opening/closing
Repairs/costs cited: Motor replacement $1,200-1,600; hinge replacement $300-800; complete door replacement quoted at $1,800-2,000. Dealer quoted $1,600 for motor and hinge replacement. Some owners report motor and cable assembly must be replaced as one unit, adding to cost.
Recalls/TSBs owners mention: Technical Service Bulletin EL004-04 addresses hinge/motor-cable assembly and bracket replacement. Recall 80C performed on some vehicles. Toyota issued warranty extension letters for power sliding door issues, but extensions expired (around 2011 for 2006 models). Some dealers offer partial warranty coverage; others deny coverage claiming warranty expired or issue is not covered.
Power sliding door cable failure and breakage
The protective plastic coating on the door cables wears off or breaks, exposing bare wire that uncoils or frays. The cable jams in the track or becomes stripped, preventing door operation. In some cases, the cable breaks completely, jamming the door in an open or partially open position.
When: Typically occurs around 3-5 years of ownership or 60,000-124,000 miles. One case noted cable fraying at both sides around 120,000 miles.
Symptoms owners cite: Cable visible frayed or uncoiled; Cable loose or slack along the track; Door jams and cannot be closed, even manually; Protective plastic coating split or cracked; Door requires forceful pulling to close after cable jams
Repairs/costs cited: Owners reported cutting cable to free jammed door. Full replacement $1,200-1,600 per door. Repair requires replacing cable assembly integrated with motor. One owner cited $1,800 replacement cost.
Recalls/TSBs owners mention: No formal recall issued. TSBs reference cable and motor assembly as combined unit. Extended warranty program (120,000 miles) covers some cases but many owners' repairs fall just outside coverage.
Rear liftgate strut failure
The gas support struts that hold the rear liftgate open fail, causing the door to fall or not stay open. Struts lose pressure and show visible oil/grease leakage. In powered liftgates, the motor does not compensate when struts fail. In non-powered (manual) liftgates, struts are the sole support and complete failure results.
When: Varies from 6 years after purchase to 14+ years. One case noted strut failure 3 months before complaint; another showed visible deterioration in cold weather.
Symptoms owners cite: Liftgate falls after reaching fully open position; Liftgate does not stay open; comes down without warning; Liftgate falls with significant force and speed; Visible oil or grease on struts; In cold weather, strut performance degrades or fails completely
Repairs/costs cited: Strut replacement cost not explicitly stated in most complaints; owners describe it as expensive. One owner mentioned over $500 quote. Manual liftgate strut replacement required because same strut used on both powered and non-powered models.
Recalls/TSBs owners mention: Recall SSC-C80 issued for powered rear liftgates in 2008. Same recall did not apply to non-powered (manual) liftgates despite using identical strut part numbers (68905-AE015). Toyota denies coverage for non-powered liftgate strut failures, citing that recall applies only to powered versions.
Power sliding door latch failure
The rear door latch mechanism fails to engage and secure the door. The C-shaped latch is covered with plastic coating which, when worn or damaged, allows moisture ingress and causes the metal clamp to swell and bind, preventing proper latching. The latch will not hold the door closed despite appearing to latch.
When: Throughout ownership, from early years to later years. One case noted sporadic failure over extended period.
Symptoms owners cite: Door will not latch or engage at rear when closing; Front latch can be secured but rear latch fails; Door remains partially open despite closure attempts; Door unlatches spontaneously while driving; Door sensor alerts and beeping while driving
Repairs/costs cited: Repair involves latch assembly replacement. Quoted at $476-500+ for repair. One complaint notes TSB exists (reference to warranty enhancement letter for rear sliding door latch assemblies, 9 years/120,000 miles coverage).
Recalls/TSBs owners mention: Toyota issued Customer Support Program (CSP) extending warranty coverage for rear sliding door latch assemblies to 9 years or 120,000 miles (whichever occurs first) for 2004-2010 MY Sienna. However, some dealers refused to honor this, charging customers despite the program.
Front door hinge and weld cracking (popping sound)
The driver's side and/or passenger's side front door hinges and welds crack or separate, creating a loud popping, cracking, or creaking noise when the door is opened or closed. The spot welds on the door check pocket or mounting panel fail. The problem is progressive, worsening over time.
When: Typically begins 5-8 years into ownership. One case noted problem starting at 32,000 miles for driver's side, then recurring on passenger's side at higher mileage.
Symptoms owners cite: Loud popping or cracking sound when opening/closing door; Creaking or grinding noise from hinge area; Popping sound emanates from center hinge area; Sound worsens over time; Problem persists or recurs after initial repair
Repairs/costs cited: Full door replacement with re-welding and paint job required, cost $470-2,000+. Some owners report repairs by body shop re-welding the hinge; problem recurs. One owner had driver's side repaired under warranty at 32,000 miles, then passenger's side failed out of warranty.
Recalls/TSBs owners mention: Toyota issued warranty enhancement POL07-04 ('Door Check Mounting Panel') covering up to 5 years or 100,000 miles. Technical Service Bulletin NV003-07 issued. However, many owners report never receiving notice of warranty extension. Coverage has expired for 2006 models at current mileages. Some repairs covered under original warranty; subsequent failures denied after warranty expires.
Rear quarter panel paint chipping and rust
Paint chips excessively in the rear quarter panel area behind both passenger sliding doors. Rust develops rapidly under and around each paint chip. Rust spreads despite factory-installed clear plastic protective strips. The rust is progressive and severe.
When: Rusting began within a few years of purchase; rust was visible up to 1/4 way up van frame by time of complaint.
Symptoms owners cite: Excessive paint chipping in rear quarter panel; Rust appearing in rear quarter panel area directly behind both passenger doors; Rust appearing under factory-installed clear plastic protective strips; Paint chipping also noted on right passenger sliding door; Every chip in the paint rusts regardless of size; Large chunks of paint falling off during washing
Repairs/costs cited: No repair option provided by Toyota. Owner planned to address rust by own expense.
Recalls/TSBs owners mention: Toyota dealerships claim rust is caused by road salt and stones, not manufacturing defect. Toyota Corporation states 'it was not their problem.' No warranty coverage or recall issued.
Manual sliding door latch failure and inoperability
Manual sliding doors refuse to open from either interior or exterior, or jam partway open/closed. The latch mechanism fails to engage or disengage properly. Doors may jam after years of sporadic malfunction.
When: Chronic issue lasting years; one owner reported passenger side not opening for years before driver's side suddenly became inoperable on the way home from dealer.
Symptoms owners cite: Door will not open from interior or exterior; Door jams partway open or closed; Door requires significant force to move; Ongoing sporadic malfunction over years
Repairs/costs cited: Dealer quoted $650 per door to fix. Owner with 6 children unable to afford repair; children forced to enter/exit from front seat or rear hatch.
Recalls/TSBs owners mention: Dealer denied goodwill repair policy coverage despite chronic problems.
Wheel and alloy rim corrosion and paint failure
Factory alloy wheels develop bubbling and corrosion within one year of purchase. Paint finishes bubble and chip, exposing metal underneath. All four wheels corroded severely.
When: Corrosion visible within 1 year of purchase; large chunks falling off during washing by later years.
Symptoms owners cite: Paint bubbling on wheel finish; Corrosion in form of finish bubbling; Large chunks of paint routinely falling off during washing; All four wheels corroded severely
Repairs/costs cited: Owner planned to replace rims at own expense. Toyota service quoted repair but denied under warranty.
Recalls/TSBs owners mention: Dealers claimed issue is due to road salt and improper cleaning, not manufacturing defect. No warranty coverage. Toyota also noted that wheels were replaced in 2008 for another defect (paint bubbling and chipping caused by metal defect).
Dashboard plastic cracking
Dashboard plastic cracks as if slashed with a razor knife. The problem is widespread on 2004+ Sienna models. Owner expresses concern that compromised dashboard integrity may affect airbag deployment safety.
When: Cracking noted on older vehicle; exact onset unclear but pattern reported back to 2004 models.
Symptoms owners cite: Plastic cracks on dashboard; Cracks appear as if slashed with razor knife
Repairs/costs cited: None provided; dealer states out of warranty and cosmetic issue with no safety concern.
Recalls/TSBs owners mention: Dealer claims cracks are due to age with no safety issues. No warranty coverage provided.
Synthesized from 217 NHTSA owner complaints — unverified consumer
allegations, summarized for patterns. The verbatim filings appear below.