The 2010 Highlander is generally solid, but the 2.7L I4 suffers catastrophic oil consumption failures, while all models face transmission cooler line corrosion and occasional VVT-i issues. The 3.5L V6 and hybrid are far more reliable choices.
2.7L I4 Catastrophic Oil Consumption / Engine Failure
Common · high severityTypical onset: 80,000-150,000 mi
Symptoms: Excessive oil consumption (1qt per 1,000 mi or worse), Blue smoke from exhaust, Check engine light with low oil pressure codes, Complete engine seizure if oil level ignored
Fix: Piston ring design flaw causes oil burning that accelerates until engine failure. Carbon buildup on rings prevents proper sealing. Requires complete engine rebuild or replacement short block. 18-24 labor hours for rebuild, 12-16 for short block swap.
Estimated cost: $4,500-7,500
Transmission Oil Cooler Line Corrosion / Leaks
Common · medium severityTypical onset: 100,000-140,000 mi
Symptoms: Transmission fluid dripping near radiator or under engine, Burnt transmission fluid smell, Low transmission fluid level on dipstick, Pink or red fluid spots on driveway
Fix: Steel cooler lines rust through where they run along frame rails, especially in salt-belt states. Sometimes cooler matrix inside radiator fails, mixing coolant and ATF. Replace both lines and inspect radiator. 2-3 labor hours for lines only, add 4-5 if radiator replacement needed.
Estimated cost: $400-800 (lines only), $1,200-1,800 (with radiator)
VVT-i Gear/Camshaft Actuator Failure
Occasional · medium severityTypical onset: 120,000-180,000 mi
Symptoms: Rattling or grinding noise on cold start (first 3-5 seconds), Check engine light with P0010, P0011, P0012, P0015 codes, Rough idle, Reduced power and fuel economy
Fix: VVT-i gears wear or oil control valves sludge up from extended oil change intervals. On V6 models, may need both intake and exhaust actuators per bank. Requires valve cover removal and timing cover access. 4-6 labor hours for one bank on V6, 3-4 hours on I4.
Estimated cost: $800-1,400
Front Lower Control Arm Bushing Deterioration
Common · low severityTypical onset: 80,000-120,000 mi
Symptoms: Clunking over bumps from front end, Wandering steering feel, Uneven tire wear on inside edges, Vibration during braking
Fix: Rubber bushings crack and separate from heat and age. Toyota doesn't sell bushings separately—requires complete lower control arm assemblies both sides. Alignment mandatory after replacement. 2.5-3.5 labor hours including alignment.
Estimated cost: $600-900
Rear Liftgate Handle/Latch Failure
Occasional · low severitySymptoms: Liftgate won't open with button or key fob, Handle feels loose or doesn't engage, Liftgate pops open while driving, Electrical latch motor clicking but not opening
Fix: Plastic linkage arms inside liftgate handle break, or latch motor fails. Often requires liftgate trim panel removal and sometimes complete latch assembly replacement. 1.5-2.5 labor hours depending on which component fails.
Estimated cost: $300-600
Transmission Mount Failure (V6 Models)
Occasional · medium severityTypical onset: 90,000-140,000 mi
Symptoms: Clunk when shifting from Park to Drive or Reverse, Excessive engine movement visible when accelerating, Vibration at idle in Drive, Knocking from under center console area
Fix: Rear transmission mount hydraulic bushings leak and collapse, allowing excessive powertrain movement. Requires supporting engine/transmission and removing crossmember. 2-3 labor hours.
Estimated cost: $400-650
Buy the 3.5L V6 or hybrid and avoid the 2.7L I4 entirely—it's a $6,000 grenade waiting to detonate, but the V6 versions are solid 200k+ mile platforms.
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.