The 2016 Sienna with the 3.5L 2GR-FE V6 is generally durable, but suffers from two critical weak points: transmission oil cooler failure that can destroy the transmission, and oil consumption issues that can grenade the engine if ignored.
Symptoms: Milky or strawberry-colored transmission fluid on dipstick, Coolant looks pink and frothy in overflow tank, Harsh shifting or slipping between gears, Check engine light with transmission codes
Fix: The internal cooler in the radiator fails, allowing ATF and coolant to mix. If caught early: replace radiator, flush transmission and cooling system multiple times (3-4 hrs labor). If contamination circulated: full transmission replacement required because coolant destroys clutch packs and valve body (12-16 hrs labor). Critical to inspect coolant and ATF at every oil change on these.
Estimated cost: $800-1,200 if caught early, $4,500-6,500 for transmission replacement
Excessive Oil Consumption / Piston Ring Failure
Occasional · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Burning 1+ quart of oil every 1,000-1,500 miles, Blue smoke on cold start or acceleration, Fouled spark plugs on cylinders 2, 4, or 6, Check engine light for misfire codes
Fix: The 2GR-FE in this generation can develop ring land failure or carbon-clogged oil control rings. Toyota had a ZE7 warranty extension (expired for 2016s now). Proper fix requires engine rebuild with updated pistons or short block replacement (20-28 hrs labor). Band-aid fix is piston soak service and more frequent oil changes, but rarely permanent. If ignored until rod knock develops, it's catastrophic.
Estimated cost: $4,500-7,500 for rebuild, $6,000-9,000 for short block replacement
Front and Rear Transmission Mounts Failure
Common · medium severity
Typical onset: 70,000-110,000 mi
Symptoms: Clunking when shifting from Park to Drive or Reverse, Vibration at idle that changes with AC compressor cycling, Excessive engine movement visible when accelerating hard, Banging noise over bumps from underneath
Fix: Hydraulic transmission mounts collapse internally, especially the rear mount. Front and rear should be replaced as a pair (2.5-3.5 hrs labor). OEM mounts last longer than aftermarket. This is maintenance, not a defect, but earlier failure than previous generations.
Estimated cost: $450-750
Power Sliding Door Cable Fray and Motor Failure
Common · medium severity
Typical onset: 90,000-140,000 mi
Symptoms: Door opens or closes slowly, stops halfway, Grinding or clicking noise during operation, Error message on dash 'Check sliding door system', Door won't latch properly when closed manually
Fix: The steel cables in both power doors fray at the pulleys, and motors wear out from salt/moisture intrusion. Can replace just the cable assembly (2-3 hrs per side) if caught early, but usually motor needs replacement too (3.5-4.5 hrs per side). Dealers will replace entire door actuator assembly for $1,800+, but aftermarket motors work fine.
Estimated cost: $600-950 per door for cable and motor
Water Pump Bearing Failure
Occasional · high severity
Typical onset: 100,000-150,000 mi
Symptoms: Grinding or squealing noise from front of engine that varies with RPM, Coolant weeping from weep hole below water pump pulley, Overheating under load or at idle, Coolant loss with no visible external leaks
Fix: The 2GR water pump can fail early due to bearing or seal deterioration. Driven by serpentine belt, so not a timing concern, but overheating damage happens fast in a V6. Replace pump, thermostat, and flush system together (3-4 hrs labor). Always use OEM pump—aftermarket fails within 20k miles routinely.
Estimated cost: $550-850
Brake Booster Vacuum Hose Check Valve Failure
Occasional · medium severity
Symptoms: Hard brake pedal requiring excessive force to stop, Hissing sound from under dash when braking, Brake pedal sinks slowly to floor when held at a stop, Check engine light with P0171/P0174 lean codes
Fix: The one-way check valve in the vacuum line to the brake booster fails, causing vacuum leak and hard pedal. This was part of a recall campaign for certain VINs (brake hose recall), but not all units covered. Replace check valve and inspect booster hose for cracks (0.5-1 hr labor). Cheap fix but critical safety item.
Estimated cost: $120-220
Owner tips
Check transmission fluid color and coolant condition every oil change—catch the oil cooler leak before it kills the trans
Monitor oil level every 500 miles if you're past 80k—these engines will consume oil with zero warning before catastrophic failure
Use 0W-20 synthetic and 5,000-mile OCIs religiously to minimize ring carbon buildup
Replace transmission mounts proactively at 80k to prevent driveline stress and wear on other components
Power sliding doors: keep tracks clean and lubricated, avoid forcing doors manually when they're in auto mode
Buy one under 80k miles with documented frequent oil changes and confirmed transmission cooler inspection—after that mileage, it's a gamble on oil consumption and a ticking time bomb on the trans cooler.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
Fitment notes: Standard top post terminals; battery located in engine bay
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Every control module on the 2011-2017 Toyota Sienna — where it lives, replacement time, and what it takes to program a replacement. Modules marked dealer / factory tool won't work after a part swap alone — budget for programming.
Electric Power Steering Control Module (EPS ECU)2.5 hr R&Raftermarket tool +0.3 hr▸ programming details
📍 Integrated with steering column assembly, under lower dash
🔧 Techstream or Autel/Launch
⚠️ Steering angle sensor zero-point calibration required after replacement
ABS Actuator / Brake Control Module with VSC (ABS/VSC)2.0 hr R&Raftermarket tool +0.3 hr▸ programming details
📍 Engine compartment, driver side near strut tower, integrated with hydraulic unit
📍 Behind rear bumper, center area near license plate
🔧 Techstream or basic scan tool
⚠️ Sensor calibration auto-initializes; front and rear sensors on Limited models
Power Seat Control Module (SEAT ECU)0.8 hr R&Rno coding
📍 Under driver and/or passenger seat, integrated with seat frame
⚠️ Plug-and-play; memory seat function on Limited models may require position relearn via user interface
Backup Camera ECU / Pre-Collision Camera ECU (CAMERA ECU)0.6 hr R&Rrelearn only +0.2 hr▸ programming details
📍 Backup camera: integrated with liftgate handle; Pre-collision camera (if equipped): behind rearview mirror
🔧 Techstream for pre-collision camera calibration
⚠️ Backup camera standard 2015+; pre-collision system on Limited models requires windshield calibration
Transmission Control Module (TCM)no coding
📍 Integrated within ECM/PCM housing (not separate module)
⚠️ Transmission control integrated into ECM; no separate TCM on 6-speed automatic
Aftermarket tool coverage varies by software version and vehicle build — treat "aftermarket tool" rows as "usually possible" and verify against your tool maker's coverage list before promising a customer. Spot a wrong location or hour? Tell us — corrections ship fast here.
Rollx Vans (Rollx) is recalling certain GMC Yukon, Sierra, Chevrolet Express 2500, Ford Transit, E-250, Toyota Sienna, Sienna Hybrid, Honda Odyssey, Chrysler Town and Country, Voyager, Pacifica, Dodge Grand Caravan, and Ram Promaster vehicles equipped with QRT-Deluxe and QRT-Max wheelchair restraints. Please refer to Rollx's recall report for specific model year information. The retractors may not lock, preventing the wheelchair from being properly secured.
Consequence: An unsecured wheelchair can move during transit, increasing the risk of injury.
Remedy: Rollx will work with Q'Straint to inspect and replace the retractors as necessary, free of charge. Owner notification letters were mailed February 5, 2026. Owners may contact Rollx's customer service at 1-800-956-6668.
SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:HOSES, LINES/PIPING, AND FITTINGS · 19V553000
2019-07-25
Vantage Mobility International, LLC (Vantage) is recalling certain 2012-2018 AMS Genesis wheelchair vans, built on a Toyota Sienna vehicles. The rubber brake hoses that attach to the rear wheel assembly may be too short, causing them to rub against the rear axle trailing arm.
Consequence: The contact may cause failure of the rear brake hoses, resulting in a loss of vehicle control and reduced braking ability, increasing the risk of a crash.
Remedy: Vantage will notify owners, and dealers will install a set of rear brake hoses that will provide the proper clearance, free of charge. The recall began December 16, 2019. Owners may contact Vantage customer service at 1-800-488-9082.
SERVICE BRAKES, HYDRAULIC:FOUNDATION COMPONENTS:HOSES, LINES/PIPING, AND FITTINGS · 19V410000
2019-06-04
Braun Corporation (Braun) is recalling certain 2014-2019 Toyota Sienna mobility van conversions. The brake lines may have incorrect tube nut fittings installed, which may cause a pressure drop within the braking system.
Consequence: The reduction in the braking system pressure may cause a loss of braking power in the rear braking system, increasing the risk of crash.
Remedy: Braun has notified owners, and dealers will install an adaptor to correct the issue, free of charge. The recall began June 25, 2019. Owners may contact Braun customer service at 1-800-488-0359.
STRUCTURE:BODY:DOOR · 16V858000
2016-11-29
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain model year 2011-2016 Toyota Sienna minivans manufactured January 4, 2010, to August 12, 2016. If the power sliding door is unable to be opened when commanded, such as if the door is frozen shut, the door may subsequently open unexpectedly, possibly while the vehicle is moving.
Consequence: If door opens while the vehicle is moving, there would be an increased risk of injury to the vehicle occupants.
Remedy: Toyota will notify owners, and dealers will replace the junction block, rear sliding door wire harnesses, and install two sub wire harnesses, free of charge. The recall began on July 28, 2017. Owners may contact Toyota customer service at 1-800-331-4331. Toyota's number for this recall is G04.
SEAT BELTS:FRONT · 16V197000
2016-04-07
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain model year 2016 Toyota Sienna vehicles manufactured February 15, 2016, to February 19, 2016. In the affected vehicles, incorrect front seat belt height adjusters may have been installed. During a crash, this incorrect height adjuster may contact the B-pillar and tear or separate.
Consequence: Failure and detachment of seat belt height adjuster would result in the occupant not being properly restrained in a crash, increasing their risk of injury.
Remedy: Toyota will notify owners, and dealers will replace the front seat belt height adjusters, free of charge. The recall began on April 29, 2016. Owners may contact Toyota customer service at 1-800-331-4331. Toyota's number for this recall is G0H.
Fuel economy (EPA)
City
18mpg
Highway
25mpg
Combined
21mpg
Fuel
Regular Gasoline
Capability & size
EPA class
Minivan - 2WD
Wiper blades
Third generation (XL30). All trims use same wiper sizes.
Size-standard part numbers — verify your connector type before buying. Rear blades are model-specific; check the package's vehicle list.
Fuel economy figures are EPA data via fueleconomy.gov (median across matching trims). Performance figures are compiled estimates for the 2016 Toyota Sienna 3.5L V6 and can vary by trim.
🔧 Database maintained under the daily editorial review of Chris Hackleman · Master Technician · 20+ years and Jeff Moore · Master Lexus & Toyota Mechanic · 20+ years.