Excessive frame rusting. There are holes in the frame from rusting. At this point in time there isn’t anything I can do about the issues. Frame is unrepairable.
2005 Toyota 4Runner suspension problems
moderate 63 complaints filed with NHTSA · avg repair $900 · see suspension across all vehicles →
Failure mileage
Complaints
63
Recalls
0
Avg fix
$900
1crash
1injury
When does it fail?
Of the 63 suspension complaints filed for the 2005 Toyota 4Runner, here's the actual mileage breakdown — failures cluster heaviest at 75,000-100,000 mi.
0-25k
25-50k
50-75k
75-100k
100-125k
125-150k
150k+
Each bar shows the share of total complaints filed at that mileage range. Peak failure window highlighted. Some owners report problems earlier; some make it well past 150,000 miles symptom-free. Maintenance habits and driving conditions shift the curve as much as mileage alone.
What stands out
Of the 11 model years of Toyota 4Runner we track for suspension problems, this one carries the most owner complaints on file — 63.
Owners have filed 63 suspension complaints with NHTSA against this vehicle, but no formal recall covers the issue — the federal record reflects what manufacturers have admitted, not everything owners are reporting.
The failure pattern owners describe
Buyer takeaway: The 2005 4Runner suffers from progressive frame rust that can appear by 57,000 miles and severely compromise structural integrity by 85,000–125,000 miles, creating unsafe conditions with suspension failures, brake issues, and parts falling off in service. Dealers commonly declare these frames safe despite visible corrosion, and Toyota has not issued a recall despite acknowledging similar defects in Tacomas and Sequoias of the same generation.
The 2005 4Runner frame rusts from the inside out, exposing structural weak points that dealers routinely declare safe to operate while parts fail in service. Owners report rust appearing as early as 57,000 miles, with frame rails becoming soft and porous by 84,000–93,000 miles. Corrosion concentrates on attachment points where suspension mounts bolt to the frame—trailing arms, control arms, differential mounts, and sway bar anchor points rust through first, causing these components to detach or crack during normal driving. Holes perforate the radiator support, frame rails, and areas around the fuel tank mounting straps. Bolts corrode in place and cannot be removed without breaking apart, trapping portions in the frame. Several owners report semi-structural components like skid plates and transmission cooling lines falling off mid-drive. One owner's rear suspension arm broke completely while driving, causing a rollover. The exterior body and engine bay remain pristine while the entire undercarriage deteriorates; owners describe the frame interior as "soft like a sponge" despite factory paint holding flaking metal together. Multiple owners note Toyota recalled similar frame defects on 2004–2005 Tacomas and Sequoias but has declined to issue a recall for the 4Runner, citing no campaign unless further investigation occurs.
Same Toyota 4Runner suspension reports on nearby years: 2006 · 2007 · 2008
Failure modes owners describe
Frame rust and structural degradation
Pervasive premature rusting of the vehicle frame, progressing from surface corrosion to deep pitting, holes, and loss of structural integrity. Rust initiates inside the boxed sections and works outward, weakening frame rails, crossbars, and mounting points.
When: Starting as early as 57,000 miles; severe by 84,000–166,000 miles
Symptoms owners cite: Visible rust scaling and flaking on frame; Holes and cracks through frame material; Frame rails becoming soft and spongy; Frame metal separating in sections; Parts of frame missing or thin enough to cause alignment issues
Repairs/costs cited: Owners report labor-intensive restoration involving grinding, chipping, wire-brushing, and repainting (one owner cited 100+ hours); frame replacement or extensive welding repair required; some vehicles declared total loss by independent mechanics or deemed unsafe for lift service
Recalls/TSBs owners mention: Toyota dealers repeatedly inform owners the vehicle is safe to operate despite observed corrosion; several dealers decline to authorize repairs; Toyota representatives have told owners no campaigns exist and refer them to NHTSA hotline; company acknowledges frame defects in 2004–2005 Tacoma and Sequoia platforms but refuses to extend recall to 4Runner
Suspension attachment point failure—trailing arms, control arms, differential mounts
Rust at frame-mounted suspension component attachment points causes fasteners to corrode and components to detach or crack during operation. Rear trailing arms, control arms, and differential mounts are commonly affected.
When: 125,000–166,000 miles typical; some owners report damage observations earlier
Symptoms owners cite: Suspension arm detaches from frame; Control arm breaks or separates while driving; Excessive wear on suspension components due to lost structural support; Vehicle becomes hard to control; Rear bumper stop falls off due to frame rot; Rollover accident (one owner)
Repairs/costs cited: Independent mechanics found rusted bolts cannot be removed without breaking; replacement of suspension arms, frame repairs, or frame replacement necessary; one owner reported rear suspension arm broke, causing vehicle rollover
Recalls/TSBs owners mention: No specific manufacturer response documented; dealers found components rusted and faulty but were not authorized to repair; manufacturer declined assistance in all cited cases
Sway bar (stabilizer bar) corrosion and fracture
Rust weakens sway bars until they fracture and detach from frame mounts during normal operation or low-speed maneuvers.
When: 125,000 miles reported in one case; low mileage (27,000) noted in one unconfirmed stabilizer bar cut case
Symptoms owners cite: Vehicle wobbles left and right at highway speeds; Loss of vehicle control above 30 MPH; Sway bar detaches from frame; Traction control and TPMS warning lights illuminate
Repairs/costs cited: Dealer replaced sway bar in one documented case; no cost estimates provided; fracture due to corrosion rather than mechanical defect
Recalls/TSBs owners mention: No manufacturer action documented
Fuel tank and skid plate corrosion with attachment failure
Rust destroys fuel tank mounting straps and skid plate bolts, causing these components to loosen or fall off while the vehicle is in motion. Holes form in frame areas adjacent to fuel tank, creating a fuel spillage and safety risk.
When: Not clearly specified; one owner detected at routine inspection; appears progressive over vehicle life
Symptoms owners cite: Gas tank skid plate falls off while driving; Bolts corrode in place and cannot be removed; Holes rust through frame near tank mounting points; Fuel leak linked to corrosion (one owner report)
Repairs/costs cited: Skid plate replacement and bolt extraction/replacement necessary; one owner ground, chipped, and wire-brushed frame to repaint and reinforce mounting points; extensive labor cited
Recalls/TSBs owners mention: No manufacturer response documented
Brake line and brake system corrosion affecting function
Rust on hydraulic brake lines, power steering lines, and brake system components causes leaks, line failure, and brake function loss. Corrosion can render brake lines unserviceable.
When: 93,000 miles noted in one case; progressive condition
Symptoms owners cite: Abnormal sound from brake pedal upon depression; Brake system failure and loss of braking ability; Power steering line corrosion and leaks; Rear brake lines rusted out
Repairs/costs cited: One owner reported mechanic replaced brake pads, rotors, power steering line, and hose; brake failure recurred after repair, suggesting underlying corrosion issue persists; another vehicle declared unsafe for service due to rusted brake lines
Recalls/TSBs owners mention: Manufacturer was notified in one case but offered no assistance
Radiator support and front frame crossbar corrosion
Rust penetrates the radiator support structure and front crossbar, creating holes and thinning the metal to the point where alignment work becomes impossible and structural integrity is compromised.
When: Not specified; discovered during maintenance inspections
Symptoms owners cite: Holes form in radiator support; Front frame crossbar rusts through; Metal too thin and weakened to allow lifting vehicle on lift; Vehicle cannot be aligned due to frame damage; Parts of frame missing where radiator support connects
Repairs/costs cited: One owner noted transmission cooling lines also corroded; alignment shops refuse service due to frame damage; no repairs completed in cited cases
Recalls/TSBs owners mention: Dealers inform owners vehicle is safe but prolonged rust could lead to severe mechanical failure; no repairs authorized
Suspension instability and handling problems
Corrosion-weakened frame and suspension components cause the vehicle to exhibit wandering, instability at highway speeds, and suspension rattles unrelated to worn bushings or shocks.
When: Less than 150,000 miles; rattle noted as early as 2015 in one case
Symptoms owners cite: Vehicle wanders at highway speeds; Impossible to keep steady on highway; Heavy suspension rattle at all times except on smooth pavement; Vehicle does not track down road well; Abnormal noises from undercarriage
Repairs/costs cited: No repairs completed; condition linked to frame rust discovered upon inspection
Recalls/TSBs owners mention: No response documented
Brake pull and steering control during braking
Steering wheel pulls hard to one side (left or right) when brakes are applied, occurring randomly with no warning. Condition may be related to suspension geometry changes caused by frame corrosion.
When: Progressive; occurs intermittently
Symptoms owners cite: Steering wheel pulls to right when brakes applied; Occasional pulling to left when braking; No warning before pull occurs; Nearly caused collision (one owner report); Occurs only sometimes, rarely twice in a row
Repairs/costs cited: No repairs documented; owner described problem as difficult to diagnose
Recalls/TSBs owners mention: No response documented
Exhaust system corrosion and leaks
Rust eats through exhaust system components, particularly the muffler and piping behind the muffler, causing exhaust to enter the cabin and parts to fall off.
When: Progressive condition; reported in relatively young vehicle (purchased 2017 in one case)
Symptoms owners cite: Exhaust smell entering cabin; Smell worsens when accelerating; Smell persists even with air recirculation or heating; Exhaust falls off while driving; Muffler requires replacement
Repairs/costs cited: Muffler replacement performed in one case; exhaust and gas tank skid plate replacement required in another; issue persists or recurs
Recalls/TSBs owners mention: No response documented
Front impact sensors loosening due to frame corrosion
Rust causes impact sensors bolted to the frame to corrode and loosen, leaving them dangling free and non-functional. This disables the airbag deployment circuit.
When: Progressive over several years of ownership
Symptoms owners cite: Impact sensors rusted loose from frame; Sensors hanging freely and not making contact; Airbags may not deploy in front-end crash
Repairs/costs cited: No repairs completed; owner noted Toyota case number (1707170870) opened but told no remedy available
Recalls/TSBs owners mention: Toyota stated no remedy available for the vehicle
Synthesized from 63 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 4 most recent
Frame rust - problem is the same as what has happened to same year Toyota tacoma pickups. These vehicles should also be recalled and have the same fix applied to them as was applied to the tacoma pickup. Purchased vehicle used in october and had shop put it up on a lift 2 months later for routine maintenance. They said frame rusted and unsafe to drive.
Tl* the contact owns a 2005 Toyota 4runner. While driving 45 MPH, the rear of the vehicle was moving. The contact stated that the sway bar fractured and detached from the frame. In addition, the traction control and TPMS warning indicators were illuminated. The vehicle was not diagnosed or repaired. The dealer and manufacturer were not contacted. The failure mileage was 125,000.
Suspension. Vehicle used in the ne us--ma. Vehicle is unstable at highway speeds. Wanders. Impossible to keep steady. Heavy rattle in suspension at all times (first noted in 2015), except on very smooth pavement. Significant rusting noted on repairs. May not pass safety inspection. No body rust. Mileage less than 150k.
Had suspension trouble with your 2005 Toyota 4Runner?
File a complaint with NHTSA → It's free, official, and how every report above got here — owner filings are the federal safety record this page is built on.
Common questions
How serious is the suspension problem on the 2005 Toyota 4Runner?
It's a documented issue but not catastrophic. 63 complaints have been filed. Repairs average $900 and most owners catch it before it causes a breakdown.
At what mileage does the suspension typically fail?
Across the 39 complaints that reported odometer mileage, most suspension failures cluster between 93,000 and 166,000 miles, with the median around 132,000. A quarter of owners report trouble before 93,000; a quarter make it past 166,000. Maintenance history matters more than the odometer alone — this is the reported failure window, not a guarantee.
What does it cost to fix?
Independent shops typically charge around $900 for suspension repairs on this vehicle. Dealer pricing tends to run 20-40% higher. The exact figure depends on the specific failure mode, parts availability, and your local labor rates. If you're outside factory warranty, an extended service contract often covers this category.
Are there any recalls related to suspension?
No active recalls currently cover suspension issues on this vehicle. The complaints filed represent owner-reported failures that haven't risen to the level of a manufacturer-issued recall — but they're still worth knowing about before you buy or budget for repairs.
Related
Complaint and recall data sourced from the National Highway Traffic Safety Administration (NHTSA)
public records database. Verify the raw federal record at
nhtsa.gov/vehicle/2005/Toyota/4Runner.
Severity ratings are derived from reported crashes, fires, injuries, and fatalities. Repair cost estimates are
independent-shop national averages and may differ in your area. Some links on this page are affiliate links.