My wife was driving to work when suddenly she heard like a whirring sound and the car just suddenly shut down. She pulled on the side and noticed fluid was leaking underneath the front side of engine. We have the vehicle towed to dealership. Talking to the agent, they told us that transmission fluid leaked into radiator and radiator coolant/trans fluid leaked into transmission. Cost of repairs:…
2005 Honda Pilot engine problems
moderate 51 complaints filed with NHTSA · avg repair $3,100 · see engine across all vehicles →
Failure mileage
Complaints
51
Recalls
0
Avg fix
$3,100
When does it fail?
Of the 51 engine complaints filed for the 2005 Honda Pilot, here's the actual mileage breakdown — failures cluster heaviest at 50,000-75,000 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
Owners have filed 51 engine 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.
No new NHTSA engine complaint has been filed on this vehicle in over 11 years — the issue may be aging out of the active population.
The failure pattern owners describe
Buyer takeaway: The 2005 Honda Pilot has a well-documented pattern of radiator internal failure around 100,000 miles that contaminates and destroys the transmission, typically costing $5,000–$7,000 to repair. Engine mount premature wear, torque converter shudder, and spark plug ejection are also commonly reported; Honda has not issued recalls despite hundreds of complaints.
The dominant failure mode in this cluster is radiator failure caused by corrosion of the transmission cooling lines built into the radiator. Owners consistently report rust on the transmission fittings, leading to fluid contamination around 100,000 miles regardless of maintenance. Transmission fluid leaks into the coolant and antifreeze enters the transmission, causing sudden loss of power or inability to shift. Repair costs run $5,000–$7,000 for radiator and transmission replacement combined.
Engine motor mounts (front and side) fail prematurely at 55,000–115,000 miles, causing vibration and harsh shifting. Spark plugs on original equipment blow out of the cylinder head at 60,000–94,000 miles, damaging the radiator and stalling the vehicle.
Owners also report torque converter shuddering at 30–45 mph, which mechanics cite as a precursor to transmission failure, and intermittent engine stalling without warning. A few complaints describe air conditioning problems, rodent infestation, radiator susceptibility to rock damage, and yaw sensor failure.
Honda has declined to issue recalls or acknowledge these issues as systemic defects. The manufacturer offers token partial reimbursement ($250–$600) in some radiator-failure cases but refuses to cover the bulk of transmission replacement costs, claiming warranty has expired.
Same Honda Pilot engine reports on nearby years: 2006 · 2007 · 2008
Failure modes owners describe
Radiator internal failure - transmission cooler line corrosion
Transmission cooling lines built into the radiator corrode and fail, allowing transmission fluid to leak into the radiator and coolant to enter the transmission. Owners report rust on transmission fittings at the radiator base where the cooler attaches. Failure commonly occurs around 100,000 miles regardless of maintenance history.
When: 100,000 miles (range 59K–137K); some at 60K; most failures cluster 100K+
Symptoms owners cite: Pink or brown fluid leak on driveway; Loss of transmission power or inability to engage gears; Shuddering or rough shifting at 35–45 mph; Vehicle stalls during driving; Temperature gauge spike; Whirring sound before sudden shutdown
Repairs/costs cited: Radiator replacement ($500–$637 reported); transmission flush/rebuild ($3,915–$5,200 reported). Multiple owners cite cascading failures requiring both radiator and transmission replacement. Total repair costs $5,031–$7,000+.
Recalls/TSBs owners mention: Honda denies knowledge of defect; offers token assistance ($250–$600 partial reimbursement in some cases) but does not acknowledge systemic issue or provide recall. No service bulletins referenced by owners in complaints.
Spark plug and coil ejection from cylinder head
Original spark plugs blow out of the cylinder head with coil pack, damaging the radiator and stalling the vehicle. Occurs at relatively low mileage with original plugs never replaced. Cylinder head threads become damaged and stripped, requiring insert repair.
When: 58K–94.5K miles; original plugs never replaced prior to failure
Symptoms owners cite: Loud bang or explosion sound while driving; Smoke under vehicle; Engine runs very rough; Coil pack found on road; Spark plug completely ejected
Repairs/costs cited: Cylinder head recondition; radiator replacement; coil pack replacement. One owner reported $3,325 total repair cost. Spark plug never recovered in some cases.
Recalls/TSBs owners mention: Honda refuses further investigation citing out-of-warranty status. No recalls issued despite multiple reported incidents at different locations.
Engine motor mount failure (front and side mounts)
Front and side engine mounts fail prematurely, causing excessive vibration and harsh or abrupt shifting. Owners report failures across the fleet at similar mileage regardless of driving conditions or maintenance history. Mounts are described as a safety component; failure may also relate to or mask other transmission issues.
When: 55,000–115,000 miles; often at 80K mark; some failures within 6 years of ownership
Symptoms owners cite: Engine vibration or excessive clunking; Harsh or abrupt shifting from Park to Drive/Reverse; Whining or humming sound from engine bay; Noticeable clunky shifts reported by multiple owners
Repairs/costs cited: Front and/or side mount replacement at owner expense (costs not consistently detailed, but noted as >$500 for front and side together). Some owners had side mount replaced only to need front mount months later.
Recalls/TSBs owners mention: No recalls issued despite widespread complaints. Dealers confirm the issue is known but do not cover under warranty.
Torque converter shudder and transmission hesitation
Vehicle shudders or hesitates at 30–45 mph, attributed to torque converter defect. Owners report this as an indicator of impending transmission failure. Hesitation on acceleration noted from early ownership (first month) in some cases.
When: 30K–160K miles; shuddering typically occurs mid-life of vehicle
Symptoms owners cite: Shuddering at 30–45 mph lasting 0.5–3 seconds; Engine hesitation on acceleration from stops; Noise at 55 mph described as metal dropping off car; Hard-to-diagnose issue; Honda cannot reproduce in some cases
Repairs/costs cited: Transmission replacement or rebuild ($3,000–$5,200 reported). Mechanics and transmission shops cite torque converter defect requiring full transmission replacement. Owners report the vehicle 'never the same' after repair.
Recalls/TSBs owners mention: Honda dealers state issue is torque converter fault but do not provide recalls or warranty coverage once vehicle exceeds mileage thresholds.
Engine stalling without warning
Engine shuts off suddenly while driving without prior warning. Immobilizer key icon flashes on instrument panel when stall occurs. Engine restarts when placed in Park. Occurs at low mileage on well-maintained vehicle.
When: 16,000 miles; 140,000 miles (occurred on multiple occasions at latter mileage)
Symptoms owners cite: Engine quits suddenly while driving; Immobilizer key icon flashes; Engine restarts when placed in Park; Recurs on multiple occasions
Repairs/costs cited: Honda dealer found no error codes in ECU and could not reproduce issue. Vehicle returned to owner unrepaired.
Recalls/TSBs owners mention: Honda dealership refuses service until issue can be duplicated. Corporate stance: no action until failure can be replicated or 'unthinkable happens.' Complaint on record with American Honda.
Rodent infestation in AC system
Mice infest the AC unit, causing horrible noise and smell. Repair required complete AC unit work. Second infestation occurred after first repair was completed, suggesting design vulnerability allowing rodent entry.
When: 2007 (early ownership); repeated within weeks after first repair
Symptoms owners cite: Horrible noise from AC unit; Foul smell from AC vents; AC malfunction
Repairs/costs cited: First repair $8,000 and took one month. Second infestation occurred shortly after return from repair. Owner referenced online complaint database showing 90% of rodent infestation complaints are Honda vehicles.
Recalls/TSBs owners mention: Honda customer service (representative named Jamal per complaint) denies knowledge of problem and refuses to acknowledge related service bulletins (06012004, NHTSA 10014213 referenced by owner).
Oxygen sensor failure
Check engine light illuminates due to defective oxygen sensor requiring replacement.
When: 100,000 miles
Symptoms owners cite: Check engine warning light illuminated
Repairs/costs cited: Oxygen sensor replacement (cost not specified). Vehicle was repaired.
Recalls/TSBs owners mention: Manufacturer made aware but did not offer assistance.
Radiator physical damage and durability
Radiator cracks from road debris (rock strikes). New OEM radiator also cracks within two months of replacement without clear cause, suggesting design flaw in radiator construction or mounting.
When: Reported at various mileages; repeated damage within two months of replacement
Symptoms owners cite: Radiator crack from road debris; Premature crack in replacement radiator
Repairs/costs cited: Factory radiator replacement. Subsequent failure within two months. Owner notes this is not common in Accord or other makes, suggesting Pilot-specific design issue.
Recalls/TSBs owners mention: No manufacturer response noted. Owner requested investigation.
Transmission fluid contamination and hard shifting
Hard or rough shifting between gears; inability to shift into certain gears. Related to radiator failure and fluid contamination. Vehicle becomes unable to move on its own power.
When: Variable; often after radiator failure event
Symptoms owners cite: Hard or impossible shifting between gears; Inability to engage reverse or first gear; Vehicle will not move even with emergency brake engaged; Loss of motion on highway or road
Repairs/costs cited: Transmission flush multiple times; transmission replacement or rebuild. Contaminated fluid requires complete system flushing.
Recalls/TSBs owners mention: No specific manufacturer response noted for this symptom alone.
Yaw rate sensor failure
Vehicle sways left to right during normal driving, requiring driver to struggle with steering wheel to maintain control. Diagnosed as yaw rate sensor failure.
When: 115,000 miles (failure at this mileage; complaint made at 122,000)
Symptoms owners cite: Vehicle sways left to right while driving; Sway occurs daily; Driver must struggle to keep vehicle from swaying
Repairs/costs cited: Cost not specified. Vehicle not repaired at time of complaint.
Recalls/TSBs owners mention: No manufacturer response noted.
Heater control motor assembly failure
Temperature control motor stays in hot position, blowing hot air regardless of temperature setting or AC engagement.
When: Not specified
Symptoms owners cite: Hot air blows from vents continuously; Cold air does not come through vents; Temperature adjustment has no effect
Repairs/costs cited: Cost not specified; repair needed to replace temperature mix motor.
Recalls/TSBs owners mention: No response noted.
Excessive oil consumption
Vehicle consumes oil at abnormally high rate with no visible leaks, requiring frequent top-ups.
When: 120,000 miles
Symptoms owners cite: Using 2 quarts every 2,300 miles; No visible oil leaks
Repairs/costs cited: Cost and repair status not specified.
Recalls/TSBs owners mention: No response noted.
Synthesized from 51 NHTSA owner complaints — unverified consumer allegations, summarized for patterns. The verbatim filings appear below.
What owners are reporting 2 most recent
Transmission cooler line inside radiator failed combining fluids and causing the transmission to malfunction. Loss of ability to drive/move vehicle while on a rural road between cities during a snowstorm with my family in the vehicle. This is a common failure and requires a new radiator and replace / rebuild the transmission. A recommendation from Honda to replace the radiator every 100,000…
Had engine trouble with your 2005 Honda Pilot?
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 engine problem on the 2005 Honda Pilot?
It's a documented issue but not catastrophic. 51 complaints have been filed. Repairs average $3,100 and most owners catch it before it causes a breakdown.
At what mileage does the engine typically fail?
Across the 47 complaints that reported odometer mileage, most engine failures cluster between 70,000 and 120,000 miles, with the median around 97,358. A quarter of owners report trouble before 70,000; a quarter make it past 120,000. 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 $3,100 for engine 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 engine?
No active recalls currently cover engine 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/Honda/Pilot.
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.