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Mitsubishi · Known Issues

2005 Mitsubishi Endeavor Problems: 9 Known Issues

2005 model year · NHTSA recalls, manufacturer TSBs, and owner forum reports · Updated September 2026

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Issue summary

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2005 Mitsubishi Endeavor has 9 documented known issues, with 4 rated critical. The most serious are Automatic Transmission Harsh Shifting and Failure ($1,500-$4,000 repair), Fuel Filler Pipe Corrosion and Fuel Leak - Recall 10V065 ($0-$0 repair), Rear Crossmember/Subframe Mount Corrosion Failure in Salt States ($600-$2,500 repair) and Fuel Tank Mounting Bracket May Split and Drop the Tank - Recall 08V454 ($0-$0 repair). Across all issues with published estimates, repair costs range from $150 to $4,000. DIY maintenance guides at au7o.io.

In This Article

  • Endeavor Fuel System2
  • Endeavor Transmission2
  • Endeavor Body/Panels1
  • Endeavor HVAC2
  • Endeavor Emissions1
  • Endeavor Drivetrain1
  • Recalls6
  • FAQ
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In This Article

  • Fuel System2
  • Transmission2
  • Body/Panels1
  • HVAC2
  • Emissions1
  • Drivetrain1
  • Recalls6
  • FAQ

All 9 Known Issues

NHTSA Recalls6 recalls

FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY:FILLER PIPE AND CAP

MITSUBISHI IS RECALLING CERTAIN MODEL YEAR 2004-2010 ENDEAVOR VEHICLES ORIGINALLY SOLD IN OR CURRENTLY REGISTERED IN THE STATES OF CONNECTICUT, DELAWARE, ILLINOIS, INDIANA, IOWA, KENTUCKY, MAINE, MARYLAND, MASSACHUSETTS, MICHIGAN, MINNESOTA, MISSOURI, NEW HAMPSHIRE, NEW JERSEY, NEW YORK, OHIO, PENNSYLVANIA, RHODE ISLAND, VERMONT, VIRGINIA, WEST VIRGINIA, WISCONSIN, AND WASHINGTON D.C. COLD STATES INCLUDE NORTH DAKOTA, SOUTH DAKOTA, NEBRASKA, KANSAS, OKLAHOMA, COLORADO, WYOMING, MONTANA, IDAHO, WASHINGTON, OREGON, AND UTAH. ADJOINING STATES INCLUDE ARKANSAS, TENNESSEE, AND NORTH CAROLINA. IN SEVERE CORROSIVE ENVIRONMENTS WHERE ROAD SALTS ARE FREQUENTLY USED IN WINTER VEHICLES MAY BE EXPOSED TO ROAD DEBRIS (MUD) MIXED WITH ROAD SALT. THIS MATERIAL CAN BECOME TRAPPED BETWEEN A REINFORCING BRACKET AND THE FUEL FILLER PIPE, POTENTIALLY CAUSING CORROSION. OVER TIME, CORROSION COULD CREATE A LEAK IN THE FUEL FILLER PIPE THAT COULD RESULT IN A FUEL LEAKAGE WHEN FUELING THE VEHICLE.

Campaign #10V06500025/02/2010

AIR BAGS

MITSUBISHI MOTORS NORTH AMERICA, INC. (MMNA) IS RECALLING CERTAIN MODEL YEAR 2010 ENDEAVOR MODEL VEHICLES MANUFACTURED BETWEEN MAY 26 AND JULY 28, 2009. THE RETAINER BRACKET USED FOR THE SEAT-MOUNTED SIDE AIRBAG FRAMES ON BOTH THE DRIVER AND FRONT PASSENGER SEATS MAY NOT HAVE BEEN PROPERLY WELDED.

Campaign #09V361000
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Other Mitsubishi Models

Mitsubishi Outlander26Mitsubishi Eclipse17Mitsubishi Outlander Sport13Mitsubishi Galant9Mitsubishi 3000GT9Mitsubishi Mirage7

Frequently Asked Questions

What are the most common Mitsubishi Endeavor problems?

According to Au7o's research across NHTSA recalls, manufacturer TSBs, and owner forum reports, the 2005 Mitsubishi Endeavor has 9 documented issues. The most frequently reported are: Automatic Transmission Harsh Shifting and Failure, Fuel Filler Pipe Corrosion and Fuel Leak - Recall 10V065, Rear Crossmember/Subframe Mount Corrosion Failure in Salt States. Of these, 4 are rated critical and should be addressed promptly.

Is the Mitsubishi Endeavor reliable?

The 2005 Mitsubishi Endeavor has 9 known issues compiled from NHTSA recalls, manufacturer TSBs, and owner forum reports. 4 issues are rated critical: Automatic Transmission Harsh Shifting and Failure and Fuel Filler Pipe Corrosion and Fuel Leak - Recall 10V065 and Rear Crossmember/Subframe Mount Corrosion Failure in Salt States and Fuel Tank Mounting Bracket May Split and Drop the Tank - Recall 08V454. Prospective buyers should inspect for these issues and factor potential repair costs into their purchase decision. Regular maintenance following the manufacturer's schedule helps prevent many common problems.

How much does it cost to fix common Mitsubishi Endeavor problems?

Repair costs for known Mitsubishi Endeavor issues range from $0 to $4,000, depending on the specific problem and whether you choose DIY or professional repair. The most critical issue, Automatic Transmission Harsh Shifting and Failure, typically costs $1,500-$4,000 to repair. Au7o provides step-by-step DIY maintenance guides that can help reduce repair costs.

What is the 2004-2011 Mitsubishi Endeavor Automatic Transmission Harsh Shifting and Failure?

The Endeavor 4-speed automatic transmission develops harsh shifting and premature wear, often failing between 100,000 and 130,000 miles. The transmission shares components with the Galant and Eclipse platforms, inheriting their reliability weaknesses. Repairs typically run $1,500-$4,000. Severity: high.

What is the 2004-2010 Mitsubishi Endeavor Fuel Filler Pipe Corrosion and Fuel Leak - Recall 10V065?

NHTSA campaign 10V065000 covers 2004-2010 Endeavors built January 2003 through March 2010 and operated in road-salt states. Long-term exposure to salt-laden road spray corrodes the fuel filler pipe until it perforates, and fuel leaks from the pipe - most obviously during refuelin… Repairs typically run $0-$0. Severity: high.

Content on this page was compiled with AI assistance using NHTSA complaints, TSBs, owner reports, and public automotive data. While we strive for accuracy, this information may contain errors. Always verify repair procedures and specifications with your vehicle's service manual or a qualified mechanic.

Data compiled from NHTSA recalls, manufacturer TSBs, automotive forums, and AI-assisted research. No aggregated owner-report counts available for this vehicle yet.

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On the 2004-2010 Mitsubishi Endeavor, nHTSA campaign 10V065000 covers 2004-2010 Endeavors built January 2003 through March 2010 and operated in road-salt states. Long-term exposure to salt-laden road spray corrodes the fuel filler pipe until it perforates, and fuel leaks from the pipe - most obviously during refueling, when the pump nozzle keeps clicking off or fuel runs onto the ground. A fuel leak near hot exhaust and road ignition sources is a fire risk. This is a geographic recall: cars that have always lived in dry states were not included.

Common Symptoms

  • Fuel smell at the right rear of the vehicle
  • Fuel spilling or running out during refueling
  • Pump nozzle repeatedly clicking off while filling
  • Visible rust or wet staining on the filler pipe

How to Fix

Free recall remedy through any Mitsubishi dealer - the filler pipe is inspected and replaced/protected under campaign 10V065000. Because the recall was written by state of registration, a car that later moved into the salt belt may need the dealer to open the campaign manually. Check the VIN at nhtsa.gov/recalls. Symptoms of an untreated pipe are a raw fuel smell at the right rear and fuel spillage while filling; do not keep filling a leaking car.

Typical repair cost:$0 - $0

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Community Reported
High ConfidenceVerifiedReviewed Aug 2026

On the 2005-2007 Mitsubishi Endeavor, nHTSA campaign 08V454000 covers 2005-2007 Endeavors on which an improperly formed fuel tank mounting bracket can split. If the bracket fails, the fuel tank can drop away from the underbody, risking a fuel leak and fire. This is a manufacturing/forming defect in the bracket itself, separate from the later 10V065 filler-pipe corrosion campaign, and it applies regardless of what state the vehicle lives in.

Common Symptoms

  • Fuel odor from underneath the vehicle
  • Visible cracking or deformation of the fuel tank mounting bracket
  • Tank appears to sag or shift
  • Clunk from under the rear floor over bumps

How to Fix

Free recall remedy: dealers apply a reinforcement cap and rivet to the fuel tank mounting bracket. Verify by VIN at nhtsa.gov/recalls - this campaign is old enough that many second- and third-owner cars were never brought in. On an unrepaired car, inspect the tank straps and brackets for cracking or sag before highway use.

Typical repair cost:$0 - $0

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Community Reported
High ConfidenceVerifiedReviewed Aug 2026

On the 2004-2011 Mitsubishi Endeavor 3.8L 6G75 V6, the Endeavor 4-speed automatic transmission develops harsh shifting and premature wear, often failing between 100,000 and 130,000 miles. The transmission shares components with the Galant and Eclipse platforms, inheriting their reliability weaknesses.

This issue also affects: Mitsubishi Eclipse, Mitsubishi Galant, Mitsubishi Lancer

Common Symptoms

  • Hard shifting between 2nd and 3rd gear
  • Transmission slipping under acceleration
  • Delayed reverse engagement
  • Overheating during towing

How to Fix

Perform ATF changes every 30,000 miles. Install an auxiliary cooler for vehicles used for towing. A quality remanufactured transmission with updated clutch packs is the best repair option.

Typical repair cost:$1,500 - $4,000

Research This Issue

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Community Reported
Medium Confidence

On the 2004-2011 Mitsubishi Endeavor 6G75 3.8L V6, a distinct, fluid-driven complaint on the 4-speed automatic, separate from the harsh-shift/failure pattern. Drivers feel a shudder or fine vibration - often described as driving over rumble strips - at a steady throttle around 35-50 mph in 3rd or 4th gear near 1500 rpm, when the torque converter clutch locks up. Mitsubishi documented it as torque converter vibration caused by breakdown of the automatic transmission fluid (TSB-03-23-006 covers the condition), and owners report that filling with a generic ATF rather than the Mitsubishi-specified fluid brings it on or brings it back after a service.

Common Symptoms

  • Shudder or rumble-strip vibration at steady throttle 35-50 mph
  • Vibration disappears the moment you brake or add throttle
  • RPM flare before lockup re-engages
  • Dark or burnt-smelling transmission fluid

How to Fix

Change the ATF with the correct Mitsubishi-specified fluid - drain-and-fill repeated two or three times is safer than a high-pressure flush on a high-mileage unit - and re-test. Correct fluid resolves a large share of these cases. If the shudder returns within a few thousand miles the TCC lining or the valve body is worn and fluid will not save it; at that point the choice is a converter and valve body versus a rebuild. Confirm the shudder happens only under TCC lockup (it disappears the instant you touch the brake or add throttle) - a lockup shudder is not the same fault as a misfire or a worn CV joint.

Typical repair cost:$150 - $2,200

Research This Issue

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Community Reported
Low ConfidenceVerifiedReviewed Aug 2026

On the 2004-2011 Mitsubishi Endeavor, on salt-belt Endeavors the rear crossmember (the subframe carrying the rear suspension) rots at its body mounts until a mount snaps off. Owners report a heavy metallic crunching noise from the rear before discovering a mount rusted through. This is the single most consequential rust failure on the nameplate because the mounts are not weldable to any safe standard and the crossmember is a discontinued part - FWD cars use MR589218 (superseded to 4100A031), AWD cars MR589198 (superseded to 4100A032). Mitsubishi's corrosion recall SR-16-003 covered front crossmember mounts on Lancer and Outlander only; it does not cover the Endeavor and does not cover the rear crossmember on any model.

Common Symptoms

  • Loud metallic crunching or banging from the rear over bumps
  • Visible rust perforation or flaking at rear subframe body mounts
  • Rear end shifts or feels unstable under cornering load
  • Rear alignment out of spec with no impact history

How to Fix

Have the rear crossmember and its four body mounts probed, not just glanced at, at every inspection on any car that has seen road salt. There is no free remedy for this nameplate. A cracked or separated mount means replacing the crossmember with a sound used unit from a dry-state car; the vehicle should not be driven with a failed rear mount. Undercoating a still-solid crossmember is the only preventive measure available.

Typical repair cost:$600 - $2,500

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Community Reported
Low ConfidenceVerifiedReviewed Aug 2026

On the 2004-2011 Mitsubishi Endeavor, endeavors left the factory without a cabin air filter - Mitsubishi treated the blower housing filter as an accessory - so leaves, needles, and grit are drawn straight onto the evaporator. That debris, combined with factory gasket material that breaks down over time, packs the evaporator drain until condensate backs up and pours out into the passenger footwell. Owners find a soaked carpet, fogged glass that will not clear, and a persistent musty or sour smell from the vents. Left wet, the carpet and underpad rot and the corrosion reaches body seams and floor-mounted connectors.

Common Symptoms

  • Water on the passenger floor, worst after running the A/C
  • Musty or mildew smell from the vents
  • Sloshing sound behind the dash
  • Persistent window fogging

How to Fix

Clear the evaporator drain rather than replacing HVAC parts: locate the drain at the base of the HVAC case on the passenger side, pull the tube, and blow it clear from below (many owners also open up the drain box to remove the disintegrated factory gasket material, which is the real source of the plug). Dry the carpet and underpad completely. Fit an aftermarket cabin filter into the blower housing to keep debris off the evaporator. Rule out a disconnected or split sunroof drain tube behind the passenger dash first - it produces an identical wet footwell but is not A/C related, and it leaks in the rain rather than only with the A/C running.

Typical repair cost:$0 - $250

Research This Issue

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Community Reported
Medium ConfidenceVerifiedReviewed Aug 2026

On the 2004-2011 Mitsubishi Endeavor, the Endeavor shares the same AC compressor platform as other Mitsubishi models of the era, and it is equally prone to premature failure. The compressor clutch and internal seals fail between 60,000 and 90,000 miles.

This issue also affects: Mitsubishi Galant, Mitsubishi Outlander, Mitsubishi Outlander Sport

Common Symptoms

  • AC blowing warm
  • Compressor clutch not engaging
  • Refrigerant leak from compressor seal
  • Intermittent cooling

How to Fix

Replace the compressor assembly with the receiver/drier and expansion valve. Flush AC lines and use the correct refrigerant charge. An OEM-quality aftermarket compressor provides good longevity at lower cost.

What you need to fix it

Only diagnosis- and fitment-reviewed repair parts are linked here.

  • BuyAutoParts five-piece A/C compressor installer kit 60-80352RK
    OEMBuyAutoParts 60-80352RK

    Confirmed compressor-replacement branch for 2004-2008 and 2010-2011 Endeavor Fitment/availability: The inspected direct U.S.

    BuyAutoParts

As an Amazon Associate, we earn from qualifying purchases; other part links may also earn au7o a commission. Confirm fitment by VIN before buying.

Typical repair cost:$500 - $1,200

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Community Reported
High Confidence

On the 2004-2011 Mitsubishi Endeavor 6G75 3.8L V6, the 6G75 Endeavor runs three catalysts: a pre-cat integrated at each exhaust manifold plus an unmonitored underfloor unit. Only the two manifold pre-cats are monitored, so a check-engine light for catalyst efficiency always points at a manifold cat, never at the big underfloor converter that most quick-lube shops quote. Owners and techs confirm the mapping on this engine: the right (windshield-side) bank sets P0421 and the left (radiator-side) bank sets P0431. The pre-cats sit right at the head and cook, and they are commonly killed early by an upstream problem - a misfire or leaking injector dumping raw fuel into the converter.

Common Symptoms

  • Check engine light with catalyst efficiency code
  • Failed emissions/OBD test
  • Sulfur or rotten-egg smell from the exhaust
  • Reduced fuel economy
  • Rattle from the manifold area on a broken substrate

How to Fix

Fix the cause before the converter. Verify no misfire codes, no fuel trim fault, and no exhaust leak upstream of the rear O2 sensor, and confirm the rear O2 sensor itself is switching correctly - a lazy rear sensor sets these codes with a healthy cat. If the pre-cat is genuinely spent, the repair is the manifold assembly for the affected bank; use the P0421 = right bank / P0431 = left bank mapping to avoid replacing the wrong side. Replacing the underfloor converter will not clear either code.

Typical repair cost:$600 - $2,000

Research This Issue

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Community Reported
Medium ConfidenceVerifiedReviewed Aug 2026

On the 2004-2011 Mitsubishi Endeavor 6G75 3.8L V6, on AWD Endeavors the rubber carrier around the driveshaft center support bearing deteriorates and collapses, letting the bearing run dry and out of alignment. Owners describe a belt-squeal or whistle that only shows up after 10-15 minutes of driving once things heat up, rising with RPM rather than road speed, and often mistaken for an accessory belt or the power steering pump. Left alone the bearing seizes and the driveshaft develops a vibration. Because Mitsubishi does not sell the bearing separately for this application, the failure typically forces replacement of the entire propeller shaft.

Common Symptoms

  • Belt-like squeal or whistle that appears after 10-15 minutes of driving
  • Noise increases with engine RPM more than road speed
  • Vibration through the floor at highway speed
  • Clunk or thump when releasing and reapplying throttle

How to Fix

Verify by spinning the shaft with the vehicle safely raised and checking the center bearing for play, roughness, and torn/sagging rubber. The dealer remedy is a complete propeller shaft assembly; some owners have had a driveline shop press in a replacement bearing and rebalance the shaft at a fraction of the cost. Check the rear differential front support bracket at the same time - a broken bracket produces a similar thump on throttle transitions. No recall covers this wear failure.

Typical repair cost:$350 - $1,200

Research This Issue

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Community Reported
Medium ConfidenceVerifiedReviewed Aug 2026
16/09/2009

FUEL SYSTEM, GASOLINE:STORAGE:TANK ASSEMBLY

MITSUBISHI IS RECALLING 45,988 MY 2005-2007 ENDEAVOR, GALANT, ECLIPSE COUPE, AND MY 2007 ECLIPSE SPYDER VEHICLES. THE BRACKET THAT IS THE ATTACHMENT POINT FOR THE LEFT REAR FUEL TANK MOUNTING STRAP MAY HAVE BEEN IMPROPERLY FORMED DURING A METAL STAMPING PROCESS. THE PROCESS MAY HAVE CAUSED THE METAL TO HAVE A SPLIT IN THE AREA WHERE THE BOLT THAT HOLDS ONE OF THE TWO FUEL TANK STRAPS TO THE UNDERSIDE OF THE VEHICLE IS LOCATED. IN THE EVENT THE FUEL TANK IS FULL AND THE VEHICLE IS SUBJECT TO A SEVERE COLLISION, THE BRACKET MAY BREAK AND ALLOW THE FUEL TANK TO DROP DOWN, POSSIBLY CAUSING A FUEL LEAK.

Campaign #08V45400009/09/2008

SEAT BELTS:FRONT

ON CERTAIN PASSENGER VEHICLES, THE RIGHT SIDE LOWER SEAT BELT ANCHOR MAY SEPARATE DURING A SEVERE VEHICLE CRASH.

Campaign #08V02200018/01/2008

ELECTRICAL SYSTEM:SOFTWARE

MITSUBISHI IS RECALLING CERTAIN MODEL YEAR 2006-2008 ENDEAVOR WITH MANUAL AIR CONDITIONING. DUE TO AN INCORRECT HEATER (HVAC) CONTROLLER SIGNAL, THE AIR FLOW FROM THE AIR VENTS MAY RANDOMLY CHANGE DIRECTION AND/OR THE TEMPERATURE MAY BRIEFLY CYCLE BETWEEN HOT AND COLD.

Campaign #10V51400020/10/2010

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What is the 2004-2011 Mitsubishi Endeavor Rear Crossmember/Subframe Mount Corrosion Failure in Salt States?

On salt-belt Endeavors the rear crossmember (the subframe carrying the rear suspension) rots at its body mounts until a mount snaps off. Owners report a heavy metallic crunching noise from the rear before discovering a mount rusted through. This is the single most consequential r… Repairs typically run $600-$2,500. Severity: high.

What is the 2005-2007 Mitsubishi Endeavor Fuel Tank Mounting Bracket May Split and Drop the Tank - Recall 08V454?

NHTSA campaign 08V454000 covers 2005-2007 Endeavors on which an improperly formed fuel tank mounting bracket can split. If the bracket fails, the fuel tank can drop away from the underbody, risking a fuel leak and fire. This is a manufacturing/forming defect in the bracket itself… Repairs typically run $0-$0. Severity: high.

What is the 2004-2011 Mitsubishi Endeavor Manifold Pre-Catalyst Efficiency Failure Setting P0421 or P0431?

The 6G75 Endeavor runs three catalysts: a pre-cat integrated at each exhaust manifold plus an unmonitored underfloor unit. Only the two manifold pre-cats are monitored, so a check-engine light for catalyst efficiency always points at a manifold cat, never at the big underfloor co… Repairs typically run $600-$2,000. Severity: medium.

What is the 2004-2011 Mitsubishi Endeavor A/C Evaporator Drain Clogging and Water in the Passenger Footwell?

Endeavors left the factory without a cabin air filter - Mitsubishi treated the blower housing filter as an accessory - so leaves, needles, and grit are drawn straight onto the evaporator. That debris, combined with factory gasket material that breaks down over time, packs the eva… Repairs typically run $0-$250. Severity: medium.

What is the 2004-2011 Mitsubishi Endeavor AC Compressor Premature Failure?

The Endeavor shares the same AC compressor platform as other Mitsubishi models of the era, and it is equally prone to premature failure. The compressor clutch and internal seals fail between 60,000 and 90,000 miles. Repairs typically run $500-$1,200. Severity: medium.

What is the 2004-2011 Mitsubishi Endeavor Propeller Shaft Center Support Bearing Collapse (AWD)?

On AWD Endeavors the rubber carrier around the driveshaft center support bearing deteriorates and collapses, letting the bearing run dry and out of alignment. Owners describe a belt-squeal or whistle that only shows up after 10-15 minutes of driving once things heat up, rising wi… Repairs typically run $350-$1,200. Severity: medium.

What is the 2004-2011 Mitsubishi Endeavor Torque Converter Clutch Shudder from ATF Breakdown or Non-Genuine Fluid?

A distinct, fluid-driven complaint on the 4-speed automatic, separate from the harsh-shift/failure pattern. Drivers feel a shudder or fine vibration - often described as driving over rumble strips - at a steady throttle around 35-50 mph in 3rd or 4th gear near 1500 rpm, when the… Repairs typically run $150-$2,200. Severity: medium.