The 2004 Sienna is built on Toyota's second-gen platform with the 3.3L V6, generally reliable but plagued by two major issues: catastrophic engine oil sludge failures and transmission oil cooler leaks that can destroy the transmission.
Engine Oil Sludge and Premature Engine Failure
Common · high severity
Typical onset: 80,000-150,000 mi
Symptoms: Check engine light with low oil pressure codes, Knocking or ticking noise from engine especially on cold starts, Oil consumption between changes (1+ quart per 1000 mi), Complete engine seizure in severe cases
Fix: The 3.3L V6 is notorious for oil sludge buildup even with regular maintenance, leading to spun bearings, scored cylinder walls, and total failure. Requires complete engine rebuild or replacement. Short block replacement takes 18-24 hours, full rebuild 25-35 hours.
Symptoms: Pink or strawberry milkshake-looking fluid in radiator, Transmission slipping, delayed engagement, or harsh shifts, Transmission overheating, Coolant in transmission pan or transmission fluid in coolant reservoir
Fix: Internal radiator failure allows coolant and ATF to mix, contaminating the entire transmission. Requires radiator replacement, complete transmission flush or rebuild, and oil cooler line replacement. If caught early (just radiator), 4-6 hours. If transmission contaminated, add 12-18 hours for rebuild. Many shops recommend transmission replacement once contaminated.
Symptoms: Loud clunk when shifting from Park to Drive or Reverse, Vibration during acceleration especially from stop, Visible engine/transmission movement when shifting, Knocking noise over bumps
Fix: The rear transmission mount (dogbone mount) fails regularly due to engine torque and age. Relatively straightforward replacement but requires supporting the powertrain. 2-3 hours labor.
Estimated cost: $300-550
Power Sliding Door Failures
Occasional · medium severity
Symptoms: Door opens or closes partially then reverses, Door won't latch or stay closed, Grinding or clicking noises during operation, Error messages or beeping without door movement
Fix: Cable stretching, motor failure, or track/roller wear causes malfunctions. Diagnosis can be time-consuming (1-2 hours). Cable replacement is 3-4 hours per side, motor is 2-3 hours. Rollers and tracks add more labor. Many owners disable the power function and use manual mode.
Estimated cost: $400-1,200 per door
Lower Ball Joint Wear
Common · medium severity
Typical onset: 80,000-120,000 mi
Symptoms: Clunking noise from front suspension over bumps, Wandering or loose steering feel, Uneven tire wear on inside edges, Failed state inspection for excessive play
Fix: Ball joints are not serviceable separately on this generation; requires entire lower control arm replacement per side. 2.5-3.5 hours per side plus alignment (1 hour). Most shops do both sides together.
Estimated cost: $600-1,000 (both sides plus alignment)
Evaporator Core Leaks (A/C Failure)
Occasional · low severity
Typical onset: 120,000-180,000 mi
Symptoms: A/C blows warm air, Sweet smell from vents, Oily residue on passenger floor or windshield, System won't hold refrigerant charge
Fix: Evaporator located behind the entire dashboard. Requires complete dash removal and HVAC box disassembly. Most labor-intensive job on this vehicle at 12-16 hours. Many owners live without A/C rather than repair.
Estimated cost: $1,800-2,800
Owner tips
Change oil religiously every 5,000 miles or less with quality synthetic to combat sludge - this engine has zero tolerance for extended intervals
Inspect radiator/coolant reservoir for pink discoloration at every service; catching the oil cooler leak early saves the transmission
Budget for a transmission fluid drain-and-fill every 30,000 miles even though Toyota says 'lifetime fluid' - not on this generation
Check transmission mount during oil changes; replacing it proactively around 100k prevents harsh shifting damage
Buy only with documented proof of frequent oil changes and recent radiator replacement; budget $5-8k reserve for inevitable engine or transmission work - the rest of the van is solid but these two issues are nearly unavoidable.
AI-assisted summary drawn from NHTSA recall data, our labor-times database, and platform knowledge. Not a substitute for a pre-purchase inspection on a specific vehicle.
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Toyota Motor Engineering & Manufacturing (Toyota) is recalling certain model year 2004-2011 Sienna vehicles originally sold in, or currently registered in, Connecticut, Delaware, Illinois, Indiana, Kentucky, Maine, Maryland, Massachusetts, Michigan, Minnesota, New Hampshire, New Jersey, New York, Ohio, Pennsylvania, Rhode Island, Vermont, Virginia, West Virginia, Wisconsin and the District of Columbia. The affected vehicles have a spare tire carrier assembly mounted under the vehicle whose attachment cable may corrode due to high concentrations of road salt splashing onto the spare tire carrier.
Consequence: If the carrier cable is corroded due to road salt, the spare tire may separate from the vehicle, increasing the risk of a crash.
Remedy: Toyota sent owners in August 2014 an interim notification to advise owners of the recall and that dealers will perform an interim remedy to remove the spare tire and relocate it to the luggage compartment, free of charge. Owners are being mailed a second letter as parts become available and dealers will replace the spare tire carrier assembly with an improved one, free of charge. The remedy campaign is being performed in phases. The first phase of the recall began July 7, 2015. Owners may contact Toyota customer service at 1-800-331-4331. NOTE: 2004-2010 Siennas subject to this recall were subject to recall campaign 10V-160 initiated in 2010. Those owners are advised that they must have their vehicles remedied again under this campaign and that having the earlier recall completed did not remedy their vehicles. Additionally, model year 1998-2003 Siennas were recalled as part of safety recall 10V-160. Owners of those vehicles that have not had not the remedy performed on their vehicles, should contact their Toyota dealer to schedule a free repair.
POWER TRAIN:AUTOMATIC TRANSMISSION · 13V429000
2013-09-26
Toyota is recalling certain model year 2004-2005 Sienna vehicles manufactured January 10, 2003, through August 10, 2005; and model year 2007-2009 Sienna vehicles manufactured February 20, 2007, through December 12, 2008. In the affected vehicles, due to a problem within the shift lock solenoid, there is a possibility that the shift lever could be moved out of Park position without depressing the brake pedal.
Consequence: If the shift lever is moved out of the Park position without the brake applied, the transmission will either engage a drive gear or Neutral, increasing the risk of a backover or roll away crash.
Remedy: Toyota will mail interim notifications to owners beginning in late October 2013. When parts are available, owners will be sent a second notice and dealers will replace the shift lock solenoid, free of charge. Owners may contact Toyota at 1-800-331-4331.
ENGINE AND ENGINE COOLING · 11V539000
2011-11-09
TOYOTA IS RECALLING CERTAIN MODEL YEAR 2004 AVALON VEHICLES; 2004 AND 2005 CAMRY, CAMRY SOLARA, HIGHLANDER, AND SIENNA VEHICLES, 2006 HIGHLANDER HYBRID; 2004 AND 2005 LEXUS ES330 AND RX330; AND 2006 LEXUS RX400H VEHICLES MANUFACTURED FROM JUNE 1, 2004 THROUGH MARCH 31, 2005, EQUIPPED WITH THE 1MZ-FE OR 3MZ-FE ENGINE. THE AMOUNT OF ADHESIVE AGENT APPLIED BETWEEN THE OUTER RING AND THE TORSIONAL RUBBER DAMPER (INNER RING) IN THE CRANKSHAFT PULLEY MAY BE INADEQUATE. IF THE ADHESIVE IS INSUFFICIENT, THERE IS A POSSIBILITY THAT THE OUTER RING MAY BECOME MISALIGNED AND IT MAY NOT PROPERLY ROTATE WITH THE INNER RING, CAUSING NOISE AND/OR ILLUMINATION OF THE BATTERY DISCHARGE INDICATOR LIGHT.
Consequence: IN SOME CASES, THE BELT FOR THE POWER STEERING PUMP MAY BECOME DETACHED FROM THE PULLEY WHICH COULD RESULT IN A LOSS OF POWER STEERING AND A SUDDEN INCREASE IN STEERING EFFORT, INCREASING THE RISK OF A CRASH.
Remedy: TOYOTA WILL NOTIFY OWNERS, AND DEALERS WILL CHECK THE CRANKSHAFT PULLEY TO IDENTIFY WHETHER IT WAS PRODUCED BY THE U.S. SUPPLIER. IF SO, THE DEALER WILL REPLACE THE PULLEY WITH A NEW ONE AT NO CHARGE. THE SAFETY RECALL IS EXPECTED TO BEGIN DURING EARLY JANUARY 2012. OWNERS MAY CONTACT TOYOTA AT 1-800-331-4331.
STRUCTURE · 10V160000
2010-04-20
TOYOTA IS RECALLING CERTAIN MODEL YEAR 1998 THROUGH 2010 SIENNA PASSENGER VEHICLES MANUFACTURED BETWEEN AUGUST 7, 1997 AND JANUARY 4, 2010, CURRENTLY REGISTERED IN OR ORIGINALLY SOLD IN CONNECTICUT, DELAWARE, ILLINOIS, INDIANA, KENTUCKY, MAINE, MARYLAND, MASSACHUSETTS, MICHIGAN, MINNESOTA, NEW HAMPSHIRE, NEW JERSEY, NEW YORK, OHIO, PENNSYLVANIA, RHODE ISLAND, VERMONT, WASHINGTON DISTRICT OF COLUMBIA, VIRGINIA, WEST VIRGINIA, AND WISCONSIN. THE SUBJECT VEHICLES ARE EQUIPPED WITH THE SPARE TIRE STOWED UNDER THE VEHICLE. IF THE VEHICLE IS OPERATED IN THE COLD CLIMATE REGIONS OF THE UNITED STATES WHERE ROAD SALT IS FREQUENTLY USED, WATER SPLASHED BACKWARDS WITH HIGH CONCENTRATIONS OF ROAD SALT CAN REACH THE SPARE TIRE CARRIER AND CORRODE THE SPARE TIRE CARRIER ASSEMBLY CABLE.
Consequence: THE CABLE MAY BREAK DUE TO EXCESSIVE CORROSION AND THE SPARE TIRE MAY SEPARATE FROM THE VEHICLE, POSSIBLY RESULTING IN A VEHICLE CRASH.
Remedy: TOYOTA WILL NOTIFY OWNERS WITH AN INTERIM LETTER INITIALLY INSTRUCTING THEM TO BRING THEIR VEHICLE TO AUTHORIZED DEALERS TO INSPECT FOR CORROSION. A SECOND NOTICE WILL BE SENT WHEN THE PERMANENT REMEDY IS AVAILABLE. FOR MORE INFORMATION, PLEASE SEE TOYOTA'S AMENDED RECALL REPORT OF JULY 19, 2010. THE SAFETY RECALL IS EXPECTED TO BEGIN ON OCTOBER 12, 2010. OWNERS MAY CONTACT TOYOTA AT 1-800-331-4331.
EQUIPMENT:OTHER:LABELS · 10V036000
2010-02-03
SOUTHEAST TOYOTA IS RECALLING CERTAIN MODEL YEAR 2005-2011 PASSENGER VEHICLES FOR FAILING TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO. 110, "TIRE SELECTION AND RIMS." THESE VEHICLES WERE SOLD WITHOUT THE REQUISITE LOAD CARRYING CAPACITY MODIFICATION LABELS.
Consequence: A DRIVER MAY OVERLOAD A VEHICLE WHICH MAY INCREASE THE RISK OF A CRASH.
Remedy: DEALERS WILL MAIL TO CONSUMERS THE CORRECTED LABEL OR THE CUSTOMER WILL HAVE THE OPTION FOR DEALERS TO INSTALL THE LABEL FREE OF CHARGE. THE SAFETY RECALL BEGAN ON MAY 27, 2010. OWNERS MAY CONTACT SOUTHEAST TOYOTA AT 1-800-301-6859.
EQUIPMENT:OTHER:LABELS · 09V234000
2009-06-25
TOYOTA IS RECALLING CERTAIN MODEL YEAR 2006 THROUGH 2009 SIENNA AND 2009 LEXUS GX PASSENGER VEHICLES. THE VEHICLE CAPACITY WEIGHT ON THE TIRE AND LOADING INFORMATION LABEL AND THE GVWR ON THE CERTIFICATION LABEL IS INSUFFICIENT FOR CERTAIN VEHICLES. SOME VEHICLES WERE ACCESSORIZED THROUGH VEHICLE PROCESSING CENTERS AND HAD ACCESSORIES INSTALLED THAT CAUSED THE VEHICLE TO EXCEED THE GVWR VALUE. THESE VEHICLES FAIL TO COMPLY WITH THE REQUIREMENTS OF FEDERAL MOTOR VEHICLE SAFETY STANDARD NO 110, "TIRE SELECTION AND RIMS," AND 49 CFR PART 567.
Consequence: THE GVWR IS INSUFFICIENT FOR THE LOAD CARRYING CAPACITY OF THE VEHICLES.
Remedy: TOYOTA WILL NOTIFY OWNERS INSTRUCTING THEM TO RETURN THEIR VEHICLE TO A TOYOTA OR LEXUS DEALER FOR AN EXCHANGE OF THE CERTIFICATION LABEL AND THE TIRE AND LOADING INFORMATION LABEL, AN INSTALLATION OF THE LOAD CARRYING CAPACITY MODIFICATION LABEL, IF NECESSARY, AND A CORRECTION TO THE OWNER'S MANUAL. THIS REMEDY WILL BE PERFORMED FREE OF CHARGE. THE SAFETY RECALL BEGAN ON DECEMBER 10, 2009. OWNERS MAY CONTACT TOYOTA AT 1-888-270-9371.
TOYOTA IS CONDUCTING A SAFETY IMPROVEMENT CAMPAIGN INVOLVING 26,501 EARLY 2004 MY SIENNA VEHICLES. IN THE EVENT THE RETENTION CLIP USED TO SECURE THE FLOOR CARPET COVER IS MISSING, THE COVER CAN INTERFERE WITH THE OPERATION OF THE ACCELERATOR PEDAL IF THE ACCELERATION PEDAL IS DEPRESSED TO NEARLY THE FULL THROTTLE POSITION.
Consequence: IF THIS OCCURS, THE ACCELERATOR PEDAL CAN BECOME STUCK WHICH COULD RESULT IN A VEHICLE CRASH.
Remedy: DEALERS WILL REPLACE THE RETENTION CLIP AND FLOOR CARPET COVER AT NO CHARGE. THE CAMPAIGN BEGAN ON JANUARY 26, 2009. OWNER NOTIFICATION IS EXPECTED TO BE COMPLETED BY EARLY APRIL 2009. OWNERS MAY CONTACT TOYOTA AT 1-888-270-9371, IF THEY HAVE ANY FURTHER QUESTIONS.
STRUCTURE:BODY:HATCHBACK/LIFTGATE · 08V244000
2008-06-03 · EA06020
TOYOTA IS CONDUCTING A SAFETY IMPROVEMENT CAMPAIGN INVOLVING 196,222 MY 2004-2006 TOYOTA SIENNA VEHICLES EQUIPPED WITH POWER REAR LIFTGATE STRUTS. THE GAS STRUTS USED TO HELP LIFT AND SUPPORT THE REAR POWER LIFTGATE COULD WEAR OUT SOONER THAN EXPECTED. AS THE GAS STRUTS DETERIORATE, THE PERFORMANCE OF THE LIFTGATE WILL BEGIN TO DEGRADE AND THE POWER REAR LIFTGATE WILL OPERATE MORE SLOWLY THAN WHEN THE GAS STRUTS WERE NEW.
Consequence: IF NOT REPAIRED, THE GAS STRUTS MAY NOT BE ABLE TO SUPPORT THE WEIGHT OF THE LIFTGATE WHEN IT IS OPEN EVENTUALLY, THE GAS STRUTS COULD DETERIORATE TO THE POINT THAT THE LIFTGATE WILL FALL ABOUT TEN INCHES AFTER IT REACHES THE FULLY OPEN POSITION, AT WHICH POINT THE POWER MOTOR WILL ENGAGE AND POWER THE LIFTGATE TO THE FULLY CLOSED POSITION. THIS CONDITION MAY CAUSE INJURY TO A PERSON WHO IS STRUCK BY THE LIFTGATE WHEN IT FALLS OR WHEN IT IS CLOSING.
Remedy: DEALERS WILL REPLACE THE GAS STRUTS WITH NEWLY DESIGNED GAS STRUTS THAT HAVE A LONGER SERVICE LIFE. THE CAMPAIGN BEGAN ON AUGUST 8, 2008, AND WILL BE MAILED IN THREE PHASES ENDING IN LATE DECEMBER 2008. OWNERS MAY CONTACT TOYOTA AT 1-888-270-9371.
SEAT BELTS · 05V327000
2005-07-20 · EA05010
ON CERTAIN MINI VANS, IN THE MIDDLE ROW SEATING POSITION, THE SHOULDER PORTION OF THE SEAT BELT MAY BIND IN THE BEZEL TRIM PIECE. THE AFFECTED SEAT BELT BEZEL IS LOCATED ON THE SHOULDER PORTION OF THE SEAT IN THE RIGHT SIDE SEAT OF THE SEVEN PASSENGER MODELS AND THE CENTER SEATING POSITION IN THE EIGHT PASSENGER MODELS.
Consequence: IF THE SEAT BELT BINDS IN THE BEZEL, THAT EXTRA WEBBING MAY EXIST IN THE SEAT BELT WHICH COULD RESULT IN AN IMPROPERLY FITTED SEAT BELT ON A PASSENGER. IN THE EVENT OF A CRASH, A SEAT OCCUPANT MAY NOT BE PROPERLY RESTRAINED INCREASING THE RISK OF PERSONAL INJURY.
Remedy: DEALERS WILL REPLACE THE SEAT BELT BEZEL AND CLIP. THE RECALL BEGAN AUGUST 5, 2005. OWNERS MAY CONTACT TOYOTA AT 1-800-331-4331.
ON CERTAIN SPORT UTILITY VEHICLES, A PART OF THE FUEL TANK MAY BECOME DAMAGED WHEN CRASHED IN THE INSURANCE INSTITUTE FOR HIGHWAY SAFETY'S (IIHS) 40 MPH FRONTAL OFFSET CRASH TEST CONDITIONS, DUE TO THE SEVERE IMPACT FORCES GENERATED.
Consequence: IF THE FUEL TANK BECOMES DAMAGED AND FUEL LEAKAGE OCCURS, A FIRE MAY RESULT IN THE PRESENCE OF AN IGNITION SOURCE.
Remedy: DEALERS WILL REPLACE THE FUEL TANK. OWNER NOTIFICATION BEGAN AUGUST 1, 2003. OWNERS SHOULD CONTACT TOYOTA AT 1-800-331-4331.
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