2003 Toyota 4RUNNER Problems

What owners report

Owner complaints about the 2003 4Runner are dominated by frame and underbody corrosion, reported from as little as 55,000 miles up to 250,000+ miles and often found during routine service, state inspection, or after a handling change. Secondary themes are brake-related symptoms (frozen calipers, ABS/accumulator failures, pedal and rotor complaints) and, in a smaller number of reports, sudden acceleration and dashboard cracking.

1. 1
   Body and structure

   Frame and underbody rust-through

   • 410 complaints (59%)
   • median 135,000 mi at 15.5 yrs old (279 state mileage)
   • 7 mention a crash, fire or injury
   • owner-quoted repair $4,000 (median of 11 quotes)
   • filed 2003–2026

   Owners describe frame rails, subframes, and cross members rusting through, sometimes with holes large enough that a tool can be pushed through the metal. Complaints often note the body, engine, and interior are in good condition while the frame is heavily corroded, and several describe the rust as progressing from the inside out. According to complaints, dealers and independent mechanics sometimes identified the corrosion during service or state inspection and advised that the vehicle not be driven; owners report being told there was no recall covering the vehicle and being quoted repair estimates in the thousands of dollars, with some repairs declined. Reported across a wide mileage range from roughly 55,000 to over 250,000 miles, frequently in vehicles described as garage-kept or used for short commutes.

   What to check: Have the frame, subframe, and suspension mounting points inspected on a lift before buying, especially at the rear control arm mounts and near weld seams. Ask whether any frame repair or rust treatment has been done, and check the state inspection history where corrosion rules apply.

   2 excerpts from owner complaints in NHTSA records

   “We recently purchased a 2003 Toyota 4RUNNER limited. Great vehicle with the exception of the frame rusting and having weak spots. We have done some research and this seems to be a common issue with the third and fourth generations. These are built on a truck frame and the Toyota sequoias, tundras and tacoma's have been recalled for this issue.”

   NHTSA complaint #11378585, filed 2020-12, 186,000 miles

   “I have a 2003 Toyota 4RUNNER, that the frame is severely rusting. It has been garage kept and/or carport kept the entire duration of owning the vehicle. It was bought new and only one owner. When you turn right it makes a scratching sound.. From other complaints, I can see this is a common issue associated with the rusted frame.”

   NHTSA complaint #11342377, filed 2020-07, 97,000 miles
2. 2
   Brakes

   Brake pedal failure and ABS warning lights

   • 93 complaints (13%)
   • median 90,000 mi at 10.5 yrs old (80 state mileage)
   • 5 mention a crash, fire or injury
   • owner-quoted repair $3,000 (median of 14 quotes)
   • filed 2003–2026

   Complaints describe the ABS, VSC, TRAC and brake warning lights coming on, sometimes with an audible alarm, followed by a hard or low brake pedal and loss of normal braking force. Some owners report being told the accumulator pump, or the component that operates the brake pump, had failed, with one shop reportedly resetting it and advising the fault would return. Others describe repeatedly vibrating rotors and sticking calipers after brake service. Mostly reported between roughly 95,000 and 190,000 miles, sometimes while braking downhill or in stop-and-go traffic.

   4 related service bulletins

   What to check: Ask whether the ABS accumulator and pump have been serviced, and drive the vehicle from cold to confirm the ABS and VSC lights stay off. Have the brake fluid, calipers, and rotors checked for corrosion and sticking.

   2 excerpts from owner complaints in NHTSA records

   “While driving my ABS, break, vsc trac and vsc off light came on solid. It was all accompanied by an alarm. I was in heading down a hill in the snow. Right after the alerts came on I had a hard break pedal with no movement and no breaks. I was not able to use the emergency break as in snow that would not have helped. I have done some research and this has happened to multiple people online and its concerning that if ABS stops/faults you lose all ability to break at all.”

   NHTSA complaint #11308782, filed 2020-02, 173,000 miles

   “While driving at approximately 30 MPH on a city street, with my little girl in the vehicle, breaks failed and loud cabin alarm sound and ABS, vsc and trac dash lights came on. We were close to home so we got it there into the garage applying emergency break and using shifter in order to stop and avoid crashing. Had vehicle towed to dealership twice as they said the fixed it after only having it 30 minutes and said the accumulator pump was blocked up. Came home, drove it twice and the one week later all the bells and whistles go off again. …”

   NHTSA complaint #10967489, filed 2017-03, 135,000 miles
3. 3
   Suspension

   Broken suspension mounting points from rust

   • 30 complaints (4%)
   • median 139,000 mi at 16.2 yrs old (25 state mileage)
   • 2 mention a crash, fire or injury
   • filed 2003–2022

   Owners describe the rear control arm, sway bar brackets, or suspension mounts separating from the frame because the surrounding metal has rusted away, sometimes after hitting a pothole or during ordinary driving. Complaints describe a shift or swerve in the rear of the vehicle followed by loss of control, with the vehicle then towed and reported undrivable. Mechanics are described as finding the mounting points reduced to very little remaining metal. Reported from roughly 100,000 to 200,000 miles, often after driving over rough roads or potholes.

   What to check: During the pre-purchase inspection, have the rear control arm and sway bar mounting brackets checked closely for corrosion and separation from the frame, and test drive over uneven surfaces.

   2 excerpts from owner complaints in NHTSA records

   “I was driving my 4RUNNER at about 20 miles per hour when it suddenly jerked to the right. I stopped and got out to see the frame had rotted apart and one of the suspension bar mounts had dropped. Luckily no one was hurt. I contacted Toyota and they said there was nothing they could do for me.”

   NHTSA complaint #11170964, filed 2019-01, 181,000 miles

   “We were hearing a noise in the rear suspension (lh) when braking or accelerating. The car was not stable to drive. We lift the vehicle and found that the frame is rusted due to the manufactuer did not protect it at the factory. The rear left suspension bracket was almost dissapeared. The vehicle was dangerous to be driven. We had to reinforce the affected part to keep the vehicle in service, but the frame is rotten. The engine, body and interior are in perfect condition but the frame.”

   NHTSA complaint #11229658, filed 2019-07, 105,000 miles
4. 4
   Vehicle speed control

   Sudden or unintended acceleration

   Mentioned in 4 of 80 sampled complaints

   A small number of complaints describe the vehicle accelerating rapidly without the driver intending it, in one case with cruise control engaged at highway speed and in another when releasing the brake at a stop. Owners report braking and pulling over, then restarting and continuing; no warning lights were noted in the highway case. Reported from about 58,000 to 240,000 miles, including at highway speeds and from a standstill.

   Recall 11V113000

   What to check: Confirm the correct floormats are installed and properly secured, since the recall concerns a pedal trapped by an unsecured mat. Ask whether the recall remedy was performed and check pedal and mat fitment before driving.

   2 excerpts from owner complaints in NHTSA records

   “I was at a complete stop. Right after I let my foot off the brake, the car lunged forward violently. It was a traumatic experience. I don't know if this was an isolated incident, will it happen again or is this common? Also, shortly after I took ownership of my car, the paint started to peel on the rear hatch below the license on the left, where there are somewhat sharp angles. Toyota repainted the rear hatch, excluding the spoiler. I just noticed two rust spots above the rear window. …”

   NHTSA complaint #11374367, filed 2020-11, 58,000 miles

   “Dashboard is cracking from side to side; a few cracks are right over the passenger airbag. I worry about the integrity of the airbag. If anything malfunctions, at least I'll have this complaint on record.”

   NHTSA complaint #11292564, filed 2020-01, 265,000 miles
5. 5
   Body and structure

   Cracked or sticky dashboard

   Mentioned in 4 of 80 sampled complaints

   Complaints describe the dashboard developing long cracks, sometimes directly over the passenger airbag area, and in one case becoming sticky from heat exposure. Owners raised concern about the airbag area, and the manufacturer was reportedly made aware in one instance. Reported between about 95,000 and 265,000 miles, in vehicles exposed to heat and sun.

   What to check: Inspect the top of the dashboard for cracks, especially around the passenger airbag cover, and check for a tacky surface in hot weather.

   An excerpt from owner complaints in NHTSA records

   “The contact owns a 2003 Toyota 4-runner. The contact stated that the dash board was severely cracked and the problem had worsened over the passenger side where the air bag was located. The manufacturer was made aware of the problem. The approximate failure mileage was 95,000.”

   NHTSA complaint #10607544, filed 2014-07, 95,000 miles

Buying note. The deciding factor on this model year is underbody condition rather than mileage, so a lift inspection of the frame and suspension mounts before purchase matters more than the service history. Also confirm the accelerator pedal recall remedy was completed and check the ABS warning lights on a cold start.

Summary written with AI from a sample of 80 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.