Ststionary rear axel housing rusted -leaking oil-inferior steal just like the frame that was replaced
2005 Toyota 4Runner powertrain problems
moderate 16 complaints filed with NHTSA · avg repair $2,500 · see powertrain across all vehicles →
Failure mileage
Complaints
16
Recalls
0
Avg fix
$2,500
When does it fail?
Of the 16 powertrain complaints filed for the 2005 Toyota 4Runner, here's the actual mileage breakdown — failures cluster heaviest at 125,000-150,000 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
Among the 11 model years of Toyota 4Runner in our records for powertrain problems, this one ranks #3 by owner-complaint volume.
No new NHTSA powertrain complaint has been filed on this vehicle in over 9 years — the issue may be aging out of the active population.
The failure pattern owners describe
Buyer takeaway: The 2005 4Runner powertrain shows recurring clunking and shifting issues, corrosion failures, and a documented ability to shift out of Park without the key in ignition—all unresolved by dealers despite some repairs attempted. Severe frame and undercarriage rust can make these vehicles unsafe and unrepairable.
The 2005 4Runner powertrain problems cluster around three critical areas. The most widespread complaint is a loud driveshaft clunk that occurs when stopping and accelerating from stops—owners describe it as feeling rear-ended, with the jolt and noise progressively worsening over the vehicle's life. Dealers cannot replicate the issue and refuse to repair it; notably, Toyota issued a Technical Service Bulletin for the identical Lexus GX470 but not for the 4Runner or Tacoma, despite shared engines and drivetrains.
Corrosion emerges as a serious failure pathway. One owner with 140k miles and meticulous maintenance had a dealership technician say he'd never seen rust that severe; power steering lines became unrepairable, and the vehicle was deemed unsafe for highway driving. Transmission coolant lines crack from rust. A transmission wiring harness corroded pins causing complete power loss and dangerous inability to accelerate in traffic, requiring harness and solenoid replacement.
Additional powertrain issues include transmission hesitation downshifting into first gear (coasting in neutral for two seconds), transmission lockup in fourth gear during highway slowdowns, and a serious safety defect: the shift lever engages from Park to Neutral without the key in the ignition and without foot on brake pedal. One documented case involved a young child shifting the parked vehicle into Neutral, causing it to roll uncontrolled into traffic.
Same Toyota 4Runner powertrain reports on nearby years: 2006 · 2007 · 2008
Failure modes owners describe
Driveshaft clunk / lurch on stopping and acceleration
Loud clunking noise and forward lurching sensation when vehicle comes to a complete stop; noise is felt throughout the vehicle frame. Owners report it feels like being rear-ended. Occurs intermittently but progressively worsens over time. Also reported on acceleration from stops. Two-second delay before jolt noted in some cases. Owners cite a two-piece driveshaft design that allegedly traps compressed air; when compression leaks, the clunk occurs.
When: From low mileage (15–20k miles) to high mileage (150k miles); happens throughout vehicle's life
Symptoms owners cite: Loud clunking or clanking noise at stops; Vehicle lurches or jolts forward after complete stop; Shuddering felt throughout vehicle frame; Two-second delay before jolt in some cases; Intermittent but progressively worsening; Occurs on acceleration from stops
Repairs/costs cited: Driveshaft lubrication attempted by dealer but failure recurred. No permanent fix applied; dealers state inability to replicate in service. One owner references online forums citing identical Lexus GX470 (same engine/drivetrain) recall fix available for Lexus but not Toyota 4Runner.
Recalls/TSBs owners mention: TSB (Technical Service Bulletin) exists for Lexus GX470 equivalent but not issued for Toyota 4Runner or Tacoma owners despite identical design. Toyota dealers stated no TSB available so no repair possible. Owners report Toyota stated this is a normal operating characteristic.
Transmission wire harness corrosion causing power loss and shifting issues
Corrosion of pins in the transmission wiring harness connector between transmission and engine wiring harness. Corrosion causes solenoid to short out and hang up on shift mechanism. Results in complete loss of acceleration ability, vehicle unable to go faster, behaves as if chugging along. Dangerous in traffic and on-ramps where quick acceleration is needed. Harness also tied to ABS and traction control systems.
When: Mileage not specified in narrative
Symptoms owners cite: RPMs rise but vehicle barely moves or fails to accelerate; Vehicle cannot engage in traffic or accelerate on ramps; Clunking sound from transmission solenoid; Loss of power while driving
Repairs/costs cited: Transmission wire harness replaced, revealing 3 corroded pins. Transmission solenoid also replaced.
Transmission delayed downshift on stopping (second to first gear hesitation)
When coming to a stop, vehicle exhibits late shift into first gear right at stopping, feeling like a bump or rear-end collision. Behavior depends on stopping speed: faster stops prevent shift to first gear entirely. Manual downshifting feels normal except between second and first gear, where a pronounced hesitation occurs. Vehicle coasts as if in neutral for approximately two seconds before finally shifting into first gear.
When: Stopping scenario; behavior inconsistent based on braking force applied
Symptoms owners cite: Late downshift into first gear at stop; Bump or jolting feeling during stop; Hesitation between second and first gear during manual downshift; Vehicle coasts in neutral for two seconds before downshifting; Faster stops prevent downshift to first gear
Shifter engagement without key or brake pedal (unintended shifting hazard)
Shift lever can be moved from Park to Neutral without key in ignition and without foot on brake pedal. In one documented case, a 4-year-old child shifted vehicle into Neutral, causing vehicle to roll uncontrolled from driveway into busy road. Condition was tested and confirmed repeatable by owner.
When: Vehicle parked with no key in ignition
Symptoms owners cite: Shift lever engages without key in ignition; Shift lever engages without foot on brake pedal; Vehicle rolls when shifted to Neutral while parked; Uncontrolled rolling hazard
Premature frame and undercarriage rust
Severe corrosion of frame, undercarriage, and structural welds observed across multiple complaints. One owner with 20 years of ownership and 140k miles reported a dealership service person stated they had never seen rust this severe on any vehicle. Rust affects power steering lines and other critical components, rendering them unrepairable. Owners report service shops declaring vehicles unsafe to drive. Frame assembly and weld points degrading from rust. Rear axle housing and transmission coolant lines cracked from corrosion.
When: Develops progressively over years of ownership; noted from 5 years of rust at time of complaint
Symptoms owners cite: Extensive corrosion of frame and undercarriage; Corroded power steering lines; Transmission coolant lines cracked and leaking from rust; Rear axle housing rusted and leaking oil; Weld points and frame assembly degrading
Repairs/costs cited: Power steering lines too corroded to service. Transmission coolant lines cracked. One owner's vehicle declared unsafe for long-distance driving due to rust severity.
Loss of power and failure to accelerate (check engine and VSC lights)
While driving at highway speed (70 mph), vehicle lost power and accelerator pedal depression did not result in acceleration. Check Engine and VSC (Vehicle Stability Control) warning lights illuminated. Dealer indicated repair would fall under NHTSA campaign 05V123000 (Engine and Engine Cooling) based on diagnostic trouble codes pulled at auto parts store.
When: At 103,000 miles
Symptoms owners cite: Loss of power while driving at 70 mph; Accelerator pedal depressed but no acceleration response; Check Engine light illuminated; VSC warning light illuminated
Codes mentioned: Referenced via NHTSA campaign 05V123000
Repairs/costs cited: Vehicle not diagnosed or repaired; owner stated vehicle would be covered under recall campaign 05V123000.
Recalls/TSBs owners mention: NHTSA campaign 05V123000 (Engine and Engine Cooling) cited as applicable by dealer
Transmission lock in fourth gear during sudden deceleration
While driving on interstate at highway speeds, if vehicle slows suddenly, transmission locks in fourth gear. Vehicle must be pulled off interstate, shut down, and allowed to cool for a few moments before transmission releases and operates normally again.
When: Highway driving during sudden deceleration events
Symptoms owners cite: Transmission locks in fourth gear during sudden slowdown; Requires vehicle shutdown and cooldown to reset
Unintended vehicle rollback on hill with foot off brake
Vehicle stopped on ramp-like hill at stop light with foot off brake pedal. Loud clanking noise followed by ratcheting sound as vehicle drifted backward uncontrolled. Also reported separately: book slid into shifter knob while driving 35 mph, knocking it out of Drive and into Reverse. Mechanic confirmed noise was heard but dismissed as normal.
When: At stops on inclined surfaces
Symptoms owners cite: Vehicle rolls backward while stopped on hill; Loud clanking and ratcheting noise during rollback; Shift lever susceptible to unintended engagement from objects; Vehicle shifts into Reverse unintentionally from objects contacting shifter
Repairs/costs cited: Mechanic heard noise but stated it was normal and was uncertain of severity.
Synthesized from 16 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 1 most recent
Had powertrain 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 powertrain problem on the 2005 Toyota 4Runner?
It's a documented issue but not catastrophic. 16 complaints have been filed. Repairs average $2,500 and most owners catch it before it causes a breakdown.
At what mileage does the powertrain typically fail?
Across the 10 complaints that reported odometer mileage, most powertrain failures cluster between 34,090 and 125,000 miles, with the median around 100,000. A quarter of owners report trouble before 34,090; a quarter make it past 125,000. 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 $2,500 for powertrain 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 powertrain?
No active recalls currently cover powertrain 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.