2003 Toyota Highlander Problems

What owners report

Owners of the 2003 Highlander report two large themes: a coolant leak from the rear of the 2.4L four-cylinder engine that traces to stripped head bolt threads, and a variety of older-vehicle wear items such as sun visors that no longer stay up, rear brake lights that stop working, and intermittent stability-control and brake warning lights. Engine and cooling complaints cluster well past 90,000 miles, while the sun visor and rear-window buffeting reports appear at very low mileage, often soon after purchase. The model year also carries a long-running set of sudden-acceleration complaints, several of which trace to floor mats over the pedal.

1. 1
   Engine cooling

   Coolant leak and overheating (stripped head bolts, 2.4L)

   • 69 complaints (27%)
   • median 114,500 mi at 9.6 yrs old (68 state mileage)
   • owner-quoted repair $2,875 (median of 24 quotes)
   • filed 2007–2019

   Owners describe coolant leaking from the rear of the four-cylinder engine, sometimes a gallon a day, followed by overheating and white smoke from the exhaust. Shops and dealers reportedly find the cylinder head bolts stripped or loose in the block, with a blown head gasket, and quotes range from a head repair to a replacement or remanufactured engine. Several owners say the same failure returned after a rebuild or engine swap. Mostly reported between roughly 85,000 and 160,000 miles, usually after a period of normal driving with no warning light.

   1 related service bulletin

   What to check: Ask for service records of any head gasket or cooling repair and look for coolant residue at the rear of the engine block near the intake manifold. Check the coolant level and look for white smoke or a sweet smell at the tailpipe after a cold start.

   2 excerpts from owner complaints in NHTSA records

   “Noticed white smoke coming out of the tailpipe in june. Then I noticed reddish/pink fluid accumulating on garage floor in july. Took it in assuming either a coolant or transmission fluid leak. Toyota told me I needed a new engine because the back headbolts were stripped and the head gasket was blown. All this was determined without removing valve cover and cams, but instead because it's a known issue. Many owners report the same thing on message boards.”

   NHTSA complaint #10626722, filed 2014-08, 78,000 miles

   “My wife's truck began leaking coolant. I was told the head gasket was blown. I paid nearly $1600 for the repairs. A year later, the coolant is leaking. When the head was pulled, the thread stripped out on 3 bolts. I found the same complaint numerous times on this website and on others. At this point, the options are thread inserts that may work or a new engine! At this point, I have been attempting to get help from Toyota. There has been nothing to date.”

   NHTSA complaint #10334135, filed 2010-06, 135,599 miles
2. 2
   Vehicle speed control

   Sudden or unintended acceleration

   • 46 complaints (18%)
   • median 77,867 mi at 7.4 yrs old (41 state mileage)
   • 22 mention a crash, fire or injury
   • owner-quoted repair $2,000 (median of 7 quotes)
   • filed 2003–2019

   Complaints describe the vehicle gaining speed or lurching forward on its own, sometimes with the driver's foot on the brake, in parking lots, in traffic and at highway speed. Some drivers report the brake pedal going to the floor or the brakes fading during the event, and several mention shifting to neutral or shutting the engine off to stop. In a few cases the dealer or owner traced the event to a floor mat covering the accelerator pedal. Reported across a wide mileage range from about 23,000 to 215,000 miles, in low-speed parking maneuvers as well as at highway speed.

   1 related service bulletin

   What to check: Confirm the correct floor mat is fitted and secured, and check that it cannot slide over the pedal. Have the accelerator pedal and throttle system inspected, and ask whether any pedal-related service has been done.

   2 excerpts from owner complaints in NHTSA records

   “Was pulling into a parking space in a strip mall, about 10 feet before the parking block the car suddenly accelerated. I was able to turn the wheel hard to the left and hit the brakes to avoid the building. I did hit the awning supports and caused the awning to sag. Was able to finally stop the car and got out safely. The car later was totaled by the insurance company.”

   NHTSA complaint #10775419, filed 2015-09, 47,000 miles

   “I pulled into a parking space at a shopping center near my home, then backed up a few feet in order to straighten my car. When I put the transmission into drive, the car suddenly surged forward entirely on its own, striking the concrete barrier a few feet in front of my car. I did not accelerate, there were no floor mats on the driver's side, and the force threw me against the steering wheel. A witness ran over to see I was injured, but I was just badly frightened. …”

   NHTSA complaint #10315318, filed 2010-03, 23,270 miles
3. 3
   Brakes

   Brake warning lights and intermittent brake complaints

   • 50 complaints (19%)
   • median 60,000 mi at 6.5 yrs old (41 state mileage)
   • 19 mention a crash, fire or injury
   • filed 2003–2017

   Owners report VSC, ABS and check engine lights coming on intermittently, sometimes staying on after brake, axle and sensor work. Others describe the pedal going to the floor or the vehicle not stopping as expected at low speed, and one owner links long-life pads to warped rotors and steering wheel shake when braking from highway speed. Dealers reportedly replaced pads, rotors, axles and sensors without resolving the warnings. Reported from about 36,000 to 97,000 miles, often during low-speed stopping or normal in-town driving.

   3 related service bulletins

   What to check: Scan for stored ABS/VSC codes and look for warning lights that stay on after a test drive. Check pedal feel, rotor condition and whether the front pads and rotors have been replaced recently.

   2 excerpts from owner complaints in NHTSA records

   “I have an '03 Toyota Highlander. Brakes failed while parking causing me to crash into cement retaining wall. The brake pedal went all the way to the floor and the brakes failed to slow and stop. There is body damage and leaking fluids as a result. The car has been towed to a Toyota dealer. Brakes have yet to be evaluated. This has not happened before. Although the car was moving slowly I was injured upon impact.”

   NHTSA complaint #10112368, filed 2005-03, 36,232 miles

   “Car was being driven slowly in traffic. When other cars stopped, the brakes were applied. Instead of stopping, the car continued forward, hitting another car. It seemed as though the brakes did not work. The car was taken to the dealer the next day to have the brakes evaluated. We were told that the repairman saw those kind of accidents all the time with anti-lock brakes. You cannot hit them hard or they will fail .”

   NHTSA complaint #10315949, filed 2010-03, 60,000 miles
4. 4
   Visibility (wipers, defrost, mirrors)

   Sun visor drops into the driver's view

   • 25 complaints (10%)
   • median 97,600 mi at 7.8 yrs old (18 state mileage)
   • 1 mention a crash, fire or injury
   • owner-quoted repair $700 (median of 7 quotes)
   • filed 2003–2017

   Owners report the driver's sun visor losing tension and falling from the stowed position, blocking the view through the windshield, especially over bumps or on rough roads. Some say it is worse in warm weather and that a replacement visor is costly, with reports that the problem returns after a few months. Dealers are described as saying the visor cannot be repaired and must be replaced. Reported from about 12,000 to 127,000 miles, with several owners noting it worsens with age and heat.

   1 related service bulletin

   What to check: Flip both visors down and up and check that they hold firmly against the headliner. On a test drive over bumps, confirm the visor does not drop.

   2 excerpts from owner complaints in NHTSA records

   “For the last year, the driver's sun visor on my 2003 Toyota Highlander limited has been loose and does not stay up - it is especially loose during warmer weather. The visor will fall down in front of the driver's face, especially when going over bumps or rough roads. This is extremely dangerous and a safety hazard which could lease to a serious incident. I have mentioned this twice while bringing my vehicle for maintenance and have been told it cannot be repaired and I would have to buy a new visor. …”

   NHTSA complaint #10311327, filed 2010-02, 152,000 miles

   “The sun visor (driver side) suddenly dropped down and obscured my vision of a red traffic light at an intersection I was approaching and my vision was impaired.”

   NHTSA complaint #10584350, filed 2014-04, 127,000 miles
5. 5
   Exterior lighting

   Rear brake light not working

   • 11 complaints (4%)
   • median 130,000 mi at 11.3 yrs old (9 state mileage, few)
   • filed 2011–2017

   Complaints describe the driver-side or passenger-side rear brake light failing to brighten when the pedal is pressed, and in some cases both brake lights eventually stopping working. Owners say replacing the bulb and the socket did not fix it, and that calls to the manufacturer about a bulletin or recall produced nothing. Reported around 130,000 to 215,000 miles, with the failure often starting on one side before spreading.

   What to check: Have someone press the brake pedal while you watch both rear lights, and check the bulbs and sockets. Ask whether the taillight assembly or wiring has been worked on.

   2 excerpts from owner complaints in NHTSA records

   “Driver side rear brake lights will not illuminate even when you depress your brakes even after you replace bulb and light socket. Right side rear is ok. I have looked online and it appears other 2003-2006 highlanders are having similar issues. Some on right side and others on left like myself.”

   NHTSA complaint #10661001, filed 2014-11, 215,000 miles

   “Driver side rear brakes will not illuminate after you depress your brakes. Replaced bulb and socket that houses bulb and will not work. Check online for similar issues and read reports of 2002-2006 highlanders having either left or right side rear not working.”

   NHTSA complaint #10661004, filed 2014-11, 215,000 miles

Buying note. On a four-cylinder example, pay closest attention to the cooling system and head gasket history, since that repair is the most expensive item owners describe. Also verify that both rear brake lights work and that the sun visors hold up, and check the floor mat arrangement before driving.

Summary written with AI from a sample of 60 NHTSA complaints for this model year (picked at random, with complaints that state a mileage and recent ones taken first), then checked automatically against the source records. Where a problem shows a complaint count, every complaint for this model year was matched with fixed keyword rules (written with AI and tested against the sample), and the mileage, age and repair figures are calculated from those complaints; owners' figures are as stated, not verified. Other counts refer to the sample. The excerpts come from NHTSA's public complaint records and are unverified; capitalisation is normalised, NHTSA staff notes are removed, and shortened text ends with “…”. Something wrong? Request a correction.