Toyota Highlander 2014–2019Common problems, reliability & repair costs

Symptoms: Wet carpet or padding, water in footwells or cargo area, fogged windows, musty/mold smell. Source is usually the roof-rail mounting clips/seals or a clogged sunroof drain tube, with water tracking down the pillars into the cabin.

Fix: Clear the sunroof drain tubes; on roof-rail leaks, pull the rails and replace the clips/seals with Toyota's updated thicker-foam parts and reseal. Cost depends on whether headliner/carpet drying or mold remediation is needed.

Sources: ToyotaNation: 3rd-gen roof rail leak fix, ToyotaNation: Highlander sunroof drain problem

Symptoms: Touchscreen stops registering taps (often along the bottom edge first), freezes, lags after updates, or goes blank. Sun glare makes the older screen hard to read.

Fix: Try a hard reset first (hold the power/volume knob ~12 seconds). For a failed digitizer, an aftermarket touchscreen/digitizer is far cheaper than the dealer head-unit quote, which can run into four figures.

Sources: ToyotaNation: stock head unit touch screen issues, toyotaproblems.com: 3rd gen entertainment/navigation

Symptoms: Clear coat flakes and peels off horizontal panels (roof, hood, hatch), sometimes within a few years. Cosmetic, not mechanical.

Fix: Toyota runs a Customer Support Program covering this peeling on affected white paint codes for up to 14 years from purchase. Many were repainted free. Out of program, a quality panel repaint is the fix and varies widely by shop and panel count.

Sources: TorqueNews: Toyota peeling white paint warranty extension, Toyota TSB / CSP paint document (NHTSA)

Symptoms: Hesitant or harsh upshifts, especially 2nd-to-3rd under light throttle; the engine revs before the upshift, with extra noise. Not a failure, a calibration issue.

Fix: Toyota issued a transmission software update (TSB) early in the 2017 run that smooths the shifts. Confirm it was applied; a dealer can reflash it.

Sources: Consumer Reports: 2017 Highlander/Sienna transmission updated, TorqueNews: TSB fixes 2017 Highlander transmission

Symptoms: Sudden oil loss, oil sprayed across the engine and undercarriage, abnormal engine noise, and the oil-pressure light. If ignored, oil starvation can damage the engine.

Fix: Replace the VVT-i oil supply line. The rubber-hose section is the weak point; many owners and shops fit the all-metal line to end the issue for good. Toyota ran a Limited Service Campaign on this hose for earlier years. Check coverage by VIN. The repair itself is inexpensive relative to the damage a failure causes.

Sources: Toyota USA Newsroom: Limited Service Campaign for VVT-i oil line, MotorReviewer: 2GR-FE/FKS reliability & problems

Symptoms: Coolant weep or whine from the water pump; rough running, misfire codes, or a check-engine light from a failing ignition coil.

Fix: Replace the water pump when it weeps; replace ignition coils (and plugs) as a set or as they fail. Both are normal wear items on the 3.5L V6 rather than design defects, but budget for them on higher-mileage cars.

Sources: MotorReviewer: 2GR water pump / ignition coil notes

Tools: Compressed air or low-pressure water source, Thin trimmer line or drain-clearing tool, Towels

1. Open the sunroof and locate the front drain holes in each corner of the opening.
2. Pour a small amount of water into a front drain and watch where it exits under the car (near the front pillar/wheel area).
3. If it doesn't drain, gently feed trimmer line or use low-pressure air to clear the tube. Do not force a stiff wire that can pop the hose off.
4. Repeat for the rear drains, which exit near the rear of the vehicle.
5. Re-test all four drains with water until they flow freely, then dry any wet carpet.

Tools: Socket set + extensions, 10mm and spark-plug socket, Torque wrench, Dielectric grease

1. Remove the engine cover and the intake components needed to reach the rear bank (rear three plugs are the harder ones).
2. Unplug and unbolt each ignition coil, then pull the coils out.
3. Remove the old spark plugs. Install new iridium plugs of the type Toyota lists for your engine (DENSO FK20HR11 on the 2GR-FE, DENSO FK20HBR8 on the 2GR-FKS). Do not gap-check or adjust them, Toyota's manual says do not adjust the gap.
4. Apply dielectric grease to the coil boots, reinstall coils, and torque the hold-down bolts.
5. Reinstall intake parts and the engine cover, then clear any codes and test for smooth running.

Tools: Hands only

1. Open the glovebox, squeeze the side stops, and let it drop down fully.
2. Pull off the filter housing cover behind the glovebox.
3. Slide out the old cabin filter.
4. Insert the new filter with the UP marks pointing up, as Toyota's manual says. Replace the cover and re-seat the glovebox.