This Service Bulletin provides updated non-electric water pump leak inspection and diagnostic tips for some 2008 – 2025 model year Toyota vehicles.
full bulletin at NHTSA ↗2011 Toyota Sienna engine problems
severe 20 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
20
Recalls
0
Avg fix
$3,100
3fires
What stands out
No new NHTSA engine complaint has been filed on this vehicle in over 15 years — the issue may be aging out of the active population.
Is there a fix? Manufacturer service bulletins
The manufacturer has issued service bulletins covering engine on this vehicle — documented repair instructions, service campaigns, or warranty extensions sent to dealers. A TSB isn't a recall (it's not a free safety remedy), but it's the manufacturer acknowledging the issue and how to fix it.
This Service Bulletin provides updated non-electric water pump leak inspection and diagnostic tips for some 2008 – 2025 model year Toyota vehicles.
full bulletin at NHTSA ↗This is to advise of various price adjustments that will affect Toyota Genuine Motor Oil and Long Life Coolant, effective March 1, 2024. These products are ordered through the Toyota Complete Maintenance Care (TCMC) website.
full bulletin at NHTSA ↗TT: HVAC drain tube is found to be blocked/clogged.
full bulletin at NHTSA ↗TT: HVAC drain tube is found to be blocked/clogged.
full bulletin at NHTSA ↗Source: NHTSA manufacturer communications. Bring the bulletin number to your dealer or shop.
The failure pattern owners describe
The oil cooler hose stands out as the most frequent complaint: rubber hoses crack or rupture, dumping oil rapidly while driving or parked. Owners report smoke from the engine, complete oil loss, and engine valve/rod knock. Multiple owners note Toyota designed a later steel replacement, implying the original rubber design was known to be problematic. Toyota issued warranty enhancement ZE2 (10 years/150,000 miles) rather than a recall, but owners exceeding mileage limits had claims denied even though the failure is acknowledged as a defect. Repair costs ranged from $496 to $665 out-of-pocket.
Engine fire incidents occurred at extremely low mileage (220–33,000 miles) with little or no dashboard warning. One insurance investigator identified a faulty fan wire short.
Owners also report unintended acceleration during braking or low-speed maneuvers, where the engine races despite brake pressure, resolving only when shifting to Park or Reverse. These events happen intermittently, preventing dealer reproduction and repair.
Stalling or rough running appears at low mileage (510–10,500 miles), sometimes recurring after dealer visits. One instance involved moisture in the engine computer. One transmission failed at 55,000 miles while in warranty, causing automatic gear shifting.
Same Toyota Sienna engine reports on nearby years: 2008
Failure modes owners describe
Engine oil cooler hose/pipe failure
Rubber oil cooler hose or pipe bursts, cracks, or separates, causing rapid or complete oil loss. Owners report the original equipment was rubber construction; some note Toyota later redesigned the part with steel. Failures occur during driving or while stationary.
When: 109,000–167,000 miles; some instances at lower mileage (120,000 miles noted). No clear pattern by calendar age alone.
Symptoms owners cite: Smoke from engine compartment; Oil visible underneath vehicle or engine bay; Low oil pressure warning light (if it illuminates); Engine hesitation or poor acceleration; Valve and rod knock noise; Engine stalling or seizing; White or dark smoke from hood
Repairs/costs cited: $496–$665 reported for hose replacement and labor. Techs confirmed rubber hose failure at two locations in one case. New replacement hose is metal, not rubber.
Recalls/TSBs owners mention: Toyota issued warranty enhancement ZE2 covering oil cooler hose for 10 years/150,000 miles. Owners beyond this limit report warranty claims denied. No recall issued despite multiple owner complaints citing this as a known defect. One owner noted Toyota issued a similar recall for Camry, Avalon, and Venza but not Sienna.
Engine fire
Vehicle caught fire in engine bay with minimal warning or no warning lights. Fires occurred at very low mileage (220 miles, 6,100 miles, 33,000 miles). One fire department report indicated ignition point was upper left corner (passenger side) of engine bay. One owner's insurance investigator identified faulty fan wire short as cause.
When: 220 miles (one incident); 6,100 miles (one incident); 33,000 miles (one incident). All very early in vehicle service life.
Symptoms owners cite: No warning lights or minimal warning before fire; Smoke from hood; Flames visible in engine bay; Fire spread to vehicle interior and surrounding property
Repairs/costs cited: Vehicles were total losses. One insurance investigator found faulty fan wire short. No repairs attempted by Toyota in cases reported.
Recalls/TSBs owners mention: No response or minimal response from Toyota per owner complaints. Dealership was helpful in one case but Toyota corporate provided no remedy.
Unintended acceleration or engine racing
Engine races or surges during braking, turning, or low-speed maneuvers. Brake pedal requires excessive pressure to stop forward motion. Shifting to Reverse or Park briefly stops the surge. Events occur intermittently, making dealer diagnosis difficult.
When: Early incidents reported at 13,000 miles. Other incidents at unspecified mileage in 2012.
Symptoms owners cite: Engine RPM increase while braking; Vehicle lurches forward despite brake pressure; Engine continues racing even with foot on brake; Occurs when turning or entering driveways
Repairs/costs cited: Toyota unable to duplicate the problem in at least one case despite two dealer visits. No repairs made.
Recalls/TSBs owners mention: Toyota refused to perform repairs when unable to duplicate the condition.
Engine stalling or rough running
Engine cranks but does not start, runs rough, or stalls intermittently, especially at stop lights or while turning. Issue recurs after dealer repairs. One instance involved moisture in computer module; another involved bad computer replacement.
When: Reported at 510 miles, 5,500 miles, 5,700 miles, 10,500 miles. Recurring issue over thousands of miles.
Symptoms owners cite: Cranks but won't start; starts after delay; Rough idle or rough running at stop lights; Engine dies at stop lights; Moisture detected in computer module
Repairs/costs cited: One bad computer replaced under warranty; one instance involved moisture in computer (no repair details given).
Recalls/TSBs owners mention: Dealer replaced bad computer under warranty in at least one case. Cause of recurring stalling not fully explained in subsequent visits.
Air conditioning housing water leak onto airbag deployment module
AC housing, made of plastic parts glued together, fails. Condensed water leaks from the housing and runs onto the airbag deployment module mounted nearby. Glue bond deteriorates over time. Water accumulation can occur undetected for extended periods (owner reported a year or two of leaking before discovery). Rust on floorboard may develop from prolonged water exposure.
When: Unspecified mileage. Owner noted water may have been leaking for a year or two before detection.
Symptoms owners cite: Water leaking from AC housing; Water pooling or running onto airbag deployment module; Rust visible on floorboard; No visible exterior water damage
Repairs/costs cited: No repair performed; owner was advised it is not safe to drive with wet module.
Recalls/TSBs owners mention: Toyota refused to address the issue despite owner contact. Similar recall exists for Camry, Avalon, and Venza but not for Sienna, per owner complaint.
Transmission failure or gear shifting malfunction
Vehicle rolls backward while in Drive; transmission shifts gears automatically without driver input. Vehicle failed at 55,000 miles while in warranty.
When: 55,000 miles
Symptoms owners cite: Vehicle rolls backward in Drive; Automatic gear shifting without input; Loss of power or response
Repairs/costs cited: Transmission replaced under warranty. Owner reported lack of detailed information from dealer about the cause.
Recalls/TSBs owners mention: Transmission replacement covered under warranty.
Brake lights stuck on
Brake lights remain illuminated for approximately 10 minutes after engine and all lights have been switched off.
When: Timing not specified; reported alongside stalling issues.
Symptoms owners cite: Brake lights do not turn off after engine shutdown; Lights remain on for ~10 minutes
Synthesized from 20 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Van just won't start. It cranks over but won't start, after tens minutes it started up fine. Van has only 510 miles. At 5500 miles vehicle again cranked but would not start. After it started, it ran rough and died at times, took it to dealer but they can not find problems. Vehicle runs fine, at about 5700 vehicle runs rough and dies at stop lights, took back to dealer this time they say it was a…
Had engine trouble with your 2011 Toyota Sienna?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the engine problem on the 2011 Toyota Sienna?
It's a meaningful issue. 20 complaints have been filed and the failure mode causes operational problems for owners. Repairs average $3,100.
At what mileage does the engine typically fail?
Across the 17 complaints that reported odometer mileage, most engine failures cluster between 24,000 and 127,000 miles, with the median around 108,250. A quarter of owners report trouble before 24,000; a quarter make it past 127,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $3,100 for engine repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to engine?
No active recalls currently cover engine issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2011/Toyota/Sienna.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.