The 2018 Highlander is generally solid but suffers from a catastrophic D-4S fuel system defect on the V6 that can destroy engines, plus some transmission cooler and hybrid-specific issues. The 2.7L I4 is nearly bulletproof but underpowered.
D-4S Fuel System Contamination (V6 models) - Engine Killer
Occasional · high severity
Typical onset: 30,000-80,000 mi
Symptoms: Metal shavings in oil during routine change, Sudden loss of power or rough running, Check engine light with multiple misfires, Fuel pump recall (NHTSA) linked to metal debris in fuel system
Fix: Low-pressure fuel pump impeller disintegrates, sending metal through injectors into cylinders, scoring cylinder walls and destroying bearings. Requires complete engine rebuild or replacement. Toyota extended warranty to 10yr/150k on some VINs but not all 2018s covered. 40-60 hours labor for short block or full rebuild.
Estimated cost: $8,000-15,000
Transmission Oil Cooler Line Leaks
Common · medium severity
Typical onset: 60,000-100,000 mi
Symptoms: ATF drips or puddles under front of vehicle, Transmission temperature warning light, Pink or red fluid visible near radiator area
Fix: Cooler lines corrode at crimp fittings or cooler itself develops pinhole leaks. Lines run along subframe and collect road salt. Replace both lines and flush cooler if contaminated. 2-3 hours labor plus fluid.
Estimated cost: $400-800
Transmission Mount Failure (All models)
Common · low severity
Typical onset: 70,000-120,000 mi
Symptoms: Clunk when shifting from Park to Drive or Reverse, Vibration at idle in Drive with brake applied, Excessive engine movement visible from engine bay
Fix: Rear transmission mount (torque strut) tears internally. Toyota uses hydraulic mounts that deteriorate faster in hot climates. Replace mount, sometimes both engine and trans mounts if rubber is cracked. 1.5-2 hours labor.
Symptoms: Red triangle warning light with multiple codes, Reduced power or refusal to start, Whining noise from rear of engine bay, Hybrid system overheat warning
Fix: Electric coolant pump for inverter fails (bearings seize or impeller breaks). Inverter overheats and shuts down hybrid system. Pump is buried behind intake manifold. 4-6 hours labor, must drain hybrid coolant and bleed system carefully.
Estimated cost: $1,200-2,000
Brake Booster Vacuum Pump Check Valve (Hybrid)
Occasional · medium severity
Typical onset: 50,000-90,000 mi
Symptoms: Hard brake pedal, especially after sitting overnight, Hissing noise when pressing brakes, Check engine light with P0533 or P050A codes, Linked to NHTSA recall on some VINs
Fix: Hybrids use electric vacuum pump since engine doesn't run constantly. Check valve or pump itself fails, losing vacuum assist. Replace pump assembly and check valve. 2-3 hours labor.
Estimated cost: $600-1,200
Fuel Injector Carbon Buildup (V6 D-4S)
Common · low severity
Typical onset: 60,000-100,000 mi
Symptoms: Rough idle when cold, Hesitation or stumble on acceleration, Misfires on cold starts (P0300-P0306 codes), Reduced fuel economy
Fix: Direct injection creates carbon deposits on intake valves since fuel doesn't wash them. Requires walnut blasting or manual scraping of valves. Some techs add port injection cleaning. 4-6 hours labor to remove intake manifold and clean all six cylinders.
Estimated cost: $600-1,200
Owner tips
V6 owners: verify your VIN is covered under the fuel pump recall/warranty extension (check Toyota.com) before buying used — unrepaired units are ticking time bombs
Change transmission fluid every 60k regardless of 'lifetime' claim, especially if you tow — cooler line leaks accelerate with dirty fluid
Hybrids: ensure hybrid battery health report is included in pre-purchase inspection, pump failures can mask battery issues
Use Top Tier gas and occasional Italian tune-up (spirited highway run) to minimize carbon buildup on V6 direct injection
I'd buy a 2018 Highlander Hybrid or 2.7L I4 if fuel pump warranty is confirmed applied and transmission service records exist; avoid non-covered V6 models unless priced $3k-5k under market to budget for potential engine replacement.
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.
ELECTRICAL SYSTEM · 18E107000
2018-11-27
Fujian Wanda Automobile Glass Industry (Wanda) is recalling certain aftermarket Replacement Windshields sold for use in 2014-2018 Toyota Highlander vehicles. The windshields have an attached wire harness that water may leak into, possibly causing damage to the vehicle's Engine Control Module (ECM).
Consequence: The ECM damage may result in the engine stalling, increasing the risk of a crash.
Remedy: Wanda will notify owners, and service centers will replace the windshields, and inspect the ECM for damage, having it replaced, as necessary, free of charge. The recall began January 29, 2019. Owners may contact Wanda customer service at 1-864-281-2760.
SERVICE BRAKES, HYDRAULIC:POWER ASSIST:VACUUM · 18V211000
2018-04-03
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2018 Toyota Camry and Highlander vehicles, 2017 Toyota Sienna and Tacoma vehicles and 2017 Lexus RX350 vehicles. During the manufacturing process, the oil galley in the rotor for the brake booster vacuum pump assembly may have been improperly machined possibly resulting in a sudden loss of brake assist.
Consequence: A sudden loss of braking assist can increase the risk of a crash.
Remedy: Toyota will notify owners, and dealers will replace the brake booster vacuum pump, free of charge. The recall began on May 9, 2018. 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 J0K/JLD.
EQUIPMENT:OTHER:LABELS · 17V831000
2017-12-20
Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain 2017-2018 Toyota 4Runner and Tundra, 2018 Toyota Highlander, RAV4 and Lexus GX460 and 2017 Toyota Sienna and Tacoma vehicles. These vehicles may have incorrect load carrying capacity modification labels. 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 load information label can result in the operator overloading the vehicle and increasing the risk of a crash.
Remedy: Toyota will notify owners and provide them with corrected labels, free of charge. The recall began on January 23, 2018. Owners may contact Toyota customer service at 1-800-331-4331. Toyota's numbers for this recall are H0Z for Toyota vehicles, and HLF for Lexus vehicles.
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