The 2018 Sienna with the 3.5L 2GR-FE V6 is generally reliable, but suffers from a catastrophic oil consumption defect that can grenade the engine, plus transmission cooler failures that can mix ATF with coolant. Both issues can total the van if ignored.
Excessive Oil Consumption / Piston Ring Failure (2GR-FE Engine)
Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Burning 1+ quart every 1,000 miles or less, Blue smoke from exhaust on cold starts or acceleration, Fouled spark plugs causing misfires (P0300-P0306), Low oil pressure light if owner doesn't monitor level, Catastrophic engine seizure if oil level runs critically low
Fix: Root cause is defective piston rings that fail to control oil. Short-term: monitor oil religiously, top off every 500-1,000 mi. Long-term requires engine rebuild (pistons, rings, possibly cylinder honing) or short-block replacement. Budget 20-30 labor hours for full rebuild, 12-16 for short-block swap. Many owners trade the van instead.
Symptoms: Pink or milky coolant in overflow reservoir (ATF mixing with coolant), Transmission slipping, delayed engagement, or limp mode, Engine overheating or erratic temperature gauge, Sweet smell from coolant mixed with burnt ATF odor, Transmission failure if not caught early
Fix: Internal transmission cooler (inside radiator) develops leak, allowing ATF and coolant to mix. Requires radiator replacement, transmission flush (often multiple flushes), new ATF, sometimes full transmission rebuild if contamination circulated long enough. 8-12 hours labor for radiator/flush; add 16-24 if transmission is damaged. Catch it early or you're buying a transmission.
Transmission Mount Failure (Rear Engine/Trans Mount)
Common · medium severity
Typical onset: 70,000-120,000 mi
Symptoms: Clunking or thudding when shifting from Park to Drive/Reverse, Excessive vibration at idle, especially in Drive, Visible engine/transmission sag when inspected from below, Harder shift engagement with age
Fix: Hydraulic rear transmission mount collapses due to heat and load. Replacement is straightforward but requires supporting powertrain. 2-3 hours labor. OEM mount recommended (aftermarket fails quickly). Often done with front engine mount at same time since labor overlaps.
Estimated cost: $400-700
Fuel Pump Recall & Field Failures (NHTSA 20V-490, 23V-723)
Occasional · high severity
Symptoms: Hard starting, especially when engine is hot, Engine stalling at idle or under load, No-start condition (crank but won't fire), Check engine light with fuel trim/fuel system codes, Sudden loss of power while driving
Fix: Low-pressure fuel pump in tank can fail due to internal impeller cracking (manufacturing defect). Toyota issued two recalls for batches of pumps. If not covered by recall, replacement requires dropping fuel tank. 3-4 hours labor. Check VIN eligibility for recalls first—free fix if covered. Out-of-pocket replacement uses updated pump design.
Estimated cost: $800-1,400 (if not recall-eligible)
Brake Line Corrosion (NHTSA 23V-047, Salt-Belt States)
Occasional · high severity
Typical onset: 60,000-100,000 mi
Symptoms: Soft or spongy brake pedal, Visible rust or flaking on steel brake lines near rear axle, Brake fluid weeping from corroded sections, Brake warning light due to pressure loss, Total brake failure if line ruptures
Fix: Steel brake lines rust through in Rust Belt climates, especially rear lines near fuel tank and axle. Toyota recalled some 2018s for this. Replacement involves fabricating and flaring new lines or using pre-bent OEM sections. 4-6 hours labor depending on how many lines need replacement. Check recall eligibility (free if covered). Preventive inspection critical in salt states.
Estimated cost: $600-1,200 (if not recall-eligible)
Power Sliding Door Motor/Cable Failures
Occasional · low severity
Typical onset: 90,000-150,000 mi
Symptoms: Door opens/closes partially then stops, Grinding or clicking noise during operation, Door won't latch fully, repeated attempts to close, Error messages on dashboard about door malfunction, Manual operation still works but power function fails
Fix: Cable-driven power sliding doors wear out cables, pulleys, or motors over time. Replacement requires door panel removal and cable rethreading. Motors easier (2-3 hours), cables more tedious (4-5 hours). OEM parts mandatory—aftermarket motors fail quickly. Both doors often fail within 20k mi of each other.
Estimated cost: $600-1,200 per door
Owner tips
Check oil level every 500-1,000 miles religiously—this engine drinks oil even when 'normal.' Carry a quart in the van at all times.
Inspect coolant color monthly. Pink tint = transmission cooler leak starting. Catch it before ATF circulates through trans.
Replace transmission fluid at 60k intervals with Toyota WS fluid only. Non-OEM fluid causes shift issues.
Rust Belt owners: annual undercoating and brake line inspection prevents catastrophic brake failure.
Verify VIN against fuel pump and brake line recalls before purchase—free fixes if eligible.
Solid family hauler if oil consumption hasn't started and transmission cooler is intact—pass on high-mileage examples showing oil loss or coolant discoloration, or budget for engine work.
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.
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Consequence: If the fuel pump fails, the engine can stall while driving, increasing the risk of a crash.
Remedy: Toyota will notify owners, and dealers will replace the fuel pump assembly with an improved one, free of charge. Owners of specific models were notified that remedy parts were available starting January 21, 2021. Owners of other models will be notified as remedy parts become available. Remedy parts should be available for all affected vehicles by late March 2021. Owners may contact Toyota customer service at 1-888-270-9371 or Lexus customer service at 1-800-255-3987. Note: This recall is an expansion of recall 20V-012. Toyota's number for this recall is 20TA02. Lexus' number for this recall is 20LA01.
Toyota Motor Engineering & Manufacturing (Toyota) recalled certain 2018-2019 4Runner, Highlander, Camry, Land Cruiser, Sequoia, Sienna, Tacoma and Tundra, and Lexus RC 300, RC 350, GS 350, GX 460, IS 300, LC 500, LS 500, LX 570, RX 350L, and 2019 Toyota Avalon and Corolla, and certain Lexus NX 300, and ES 350 vehicles on January 13, 2020.
On March 4, 2020, Toyota expanded the recall to include certain 2014-2015 Toyota 4Runner and Land Cruiser, 2018 Avalon, Corolla, 2014 FJ Cruiser, 2017 Sienna and Lexus 2018 ES 350, 2018-2019 GS 300, 2013-2014 GS350, 2014-2015 GX 460, IS 350 and LX 570, 2014 IS F, 2018-2019 IS 350, LC 500H and LS 500H, 2013-2015 LS 460, 2015 NX 200T and RC350, 2017 RC 200T and RX 350. Toyota also removed the 2018-2019 Toyota 4Runner and Land Cruiser and 2018-2019 Lexus GX 460 and LX 570 and 2019 NX300 from inclusion in this recall. On March 19, 2020, Toyota expanded the recall to include 2015 Lexus GS350 vehicles. The low-pressure fuel pump inside the fuel tank may fail.
Consequence: If the fuel pump fails, the engine can stall while driving, increasing the risk of a crash.
Remedy: Toyota will notify owners, and dealers will replace the fuel pump, free of charge. The recall began May 4, 2020. Owners may contact Toyota customer service at 1-888-270-9371 or Lexus customer service at 1-800-255-3987. Toyota's numbers for this recall are 20TB02 and 20TA02 for Toyota vehicles and 20LB01 and 20LA01 for Lexus vehicles.
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.
STEERING · 19V532000
2019-07-16
Braun Corporation (Braun) is recalling certain modified 2017-2020 Toyota Sienna vehicles. The steering shaft extensions may have been improperly manufactured, possibly causing the extensions to fracture.
Consequence: If the steering shaft extension completely fractures, it can cause a loss of steering, increasing the risk of a crash.
Remedy: Braun has notified owners, and dealers will replace the steering shaft extensions, free of charge. The recall began July 25, 2019. Owners may contact Braun customer service at 1-800-488-0359.
EQUIPMENT:OTHER:LABELS · 19V503000
2019-06-28
Southeast Toyota Distributors, LLC (SET) is recalling certain 2017-2019 Toyota Camry, Corolla, Rav4, Sienna, and Yaris iA vehicles equipped with factory-installed floor mats. The load carrying capacity modification label may be incorrect. As such, these vehicles fail to comply with the requirements of Federal Motor Vehicle Safety Standard (FMVSS) number 110, "Tire Selection and Rims."
Consequence: An incorrect label may lead to unintentionally overloading the vehicle, increasing the risk of a crash.
Remedy: SET will notify owners and provide a corrected label for placement over the inaccurate label, free of charge. The recall began August 23, 2019. Owners may contact Toyota customer service at 1-888-270-9371. SET's number for this recall is SET19A.
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.
WHEELS · 18V130000
2018-02-22
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2018 Toyota Sienna vehicles built with a specific lot of 10-spoke alloy wheels from one production facility. These wheels may not have been properly cooled during manufacturing. As a result, the wheels may crack in the spokes from an impact while driving.
Consequence: If the wheels crack at the spokes, the wheel may separate from the hub assembly causing a loss of vehicle control and increasing the risk of a crash.
Remedy: Toyota began notifying owners initially by phone on February 26, 2018 and will mail letters to any unnotified owner starting on April 20, 2018. Dealers will inspect the wheels and replace them if necessary depending on their production location, free of charge. Owners may contact Toyota customer service at 1-888-270-9371. Toyota's number for this recall is J0J.
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