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2015 Toyota Sienna Engine Problems

8 owner-reported engine complaints from NHTSA data

8
Complaints
3
Fires
Jan 2020Nov 2021
Date Range

Data sourced from NHTSA public database. For informational purposes only. Always consult a qualified mechanic.

Owner Complaints (8)

criticalENGINE
FireFiled: May 2025

Your engine caught fire while driving, forcing you to evacuate the vehicle within seconds before it became engulfed in flames. The fire department had to extinguish the fire, and the entire vehicle was destroyed. You had received an engine warning light previously and had the vehicle repaired, but the warning light was never cleared before the fire occurred.

NHTSA #: 11660309
criticalENGINE
Filed: Feb 2024

Your intake valve became burnt and stuck, causing cylinder 3 to lose compression. Your check engine light came on and started flashing, and your car immediately began running rough with no acceleration. Two different shops confirmed the issue, and when you tried to merge onto a high-speed road, your car wouldn't accelerate, creating a safety hazard. Fixing this will likely require removing the cylinder head to clean or replace the burnt intake valve and address any carbon buildup.

NHTSA #: 11573361
highENGINE
Filed: Feb 2026

Your engine is leaking oil through the timing chain cover and coolant is also leaking. This oil leak has happened repeatedly even after being repaired before at 59,000 miles. The issue appears to stem from a design problem with how the timing chain cover is sealed.

NHTSA #: 11716185
mediumENGINE
Filed: Nov 2021

The contact owns a 2015 Toyota Sienna. The contact stated while starting the vehicle he noticed that the vehicle was shuddering and shaking uncontrollably. The check engine warning light was illuminated. The contact attempted to restart the vehicle however, the failure persisted. The contact took the vehicle to an independent mechanic to be diagnosed. The contact was informed that the failure was due to low cylinder pressure on cylinder #6. The mechanic was not able to do the repair on the vehicle, so the contact took the vehicle to the local dealer who diagnosed and confirmed the failure as a misfire and low-pressure cylinder #6 and that the spark plug was damaged. The vehicle was repaired however, the failure persisted. The dealer recommended that the engine be replaced. The vehicle was not repaired. The manufacturer was made aware of the failure. The failure mileage was approximately 87,000.

NHTSA #: 11440475
mediumENGINE
Filed: Jan 2020

HAD AN ENGINE OIL LEAK ON 2015 TOYOTA SIENNA. TOYOTA DEAL DIAGNOSED AND REPLACED TIMING COVER GASKET. STILL LEAKED, SECOND REPAIR BY DEALER WAS SAID TO BE TO HAIRLINE CRACK IN UPPER OIL PAN BEFORE REPAIR AUTHORIZATION ( AFTER THIRD REPAIR AND MY COMPLAINT) DEALER STATED IT WAS REALLY UPPER OIL PAN GASKET - CHANGED STORY). THIRD REPAIR WAS TO REPLACE CRANKSHAFT SEAL AND SERPENTINE BELT. TOYOTA DEALER STATED UPON THIRD REPAIR THAT THE CRANKSHAFT SEAL WAS BAD AND HAD SPRAYED OIL ALL OVER ENGINE AND SERPENTINE BELT, SERPENTINE BELT WAS SOAKED WITH OIL AND DETERIORATED. WOULD THIS BE A SAFETY PROBLEM IS THE BELT BROKE OR SLIPPED WHILE DRIVING.? ANY OTHER REPORTS OF THIS? ".MP4" VIDEO CLIP AVAILABLE AS ".MP4" 9(CONTACT [XXX]). INFORMATION REDACTED PURSUANT TO THE FREEDOM OF INFORMATION ACT (FOIA), 5 U.S.C. 552(B)(6). *TR

NHTSA #: 11302322
mediumENGINE,FUEL/PROPULSION SYSTEM
Filed: Jan 2020

WHEN THE CAR IS AT IDLE SPEED, SUCH AS WAITING FOR TRAFFIC TO CLEAR FOR A LEFT TURN, THE CAR WILL JUST DIE WITHOUT WARNING. IT WILL USUALLY RESTART RIGHT AWAY, BUT THIS HAS NEARLY CAUSED A COLLISION. THE DEALERSHIP IN BELLEVUE, WA SAYS THAT'S A NORMAL THING IF THE CAR ISN'T PROPERLY MAINTAINED. I HAVE BROUGHT THE CAR TO THAT DEALERSHIP FOR ALL BUT ONE OF THE MAINTENANCE INTERVALS, AND THE ONLY OTHER TIME WAS FOR MAINTENANCE WHEN WE WERE IN OHIO. HAVING THE THROTTLE BODY CLEANED IS NOT ON THE ROUTINE MAINTENANCE SCHEDULE. WHEN THE CAR DOES DIE THERE ARE NO CODES OR OTHER SYMBOLS THAT COME UP ON THE DISPLAY, OTHER THAN TO SAY THAT THE CAR DIED.

NHTSA #: 11302373
mediumENGINE
FireFiled: Mar 2017

TL* THE CONTACT OWNS A 2015 TOYOTA SIENNA. WHILE STATIONARY, THE VEHICLE CAUGHT FIRE WITHOUT WARNING. THE CONTACT STATED THAT SMOKE CAME FROM THE ENGINE COMPARTMENT AND FLAMES EMERGED DIRECTLY AFTERWARD. A POLICE REPORT WAS FILED. THE FIRE DEPARTMENT EXTINGUISHED THE FIRE. THE CONTACT'S TWO CHILDREN RECEIVED MEDICAL TREATMENT FOR SMOKE INHALATION. THE CONTACT STATED THAT THE VEHICLE HAD AN OPEN RECALL PER NHTSA CAMPAIGN NUMBER: 16V858000 (STRUCTURE). THE MANUFACTURER WAS MADE AWARE OF THE FAILURE. THE FAILURE MILEAGE WAS 42,000.

NHTSA #: 10969725
mediumENGINE
FireFiled: Oct 2016

TL* THE CONTACT OWNS A 2015 TOYOTA SIENNA. WHILE DRIVING 55 MPH, THE VEHICLE STALLED WITHOUT WARNING. THE CONTACT SMELLED A BURNING ODOR FROM THE VEHICLE AND CALLED A TOW COMPANY TO TOW THE VEHICLE TO HIS RESIDENCE. THE VEHICLE WAS TOWED TO AN AUTHORIZED DEALER WHERE THE CONTACT WAS INFORMED THAT THE ENGINE HAD CAUGHT FIRE. THE ENGINE WAS NOT REPLACED; HOWEVER, REPAIRS WERE MADE TO THE FAULTY ENGINE. THE FAILURE MILEAGE WAS 12,000. THE VIN WAS NOT AVAILABLE.

NHTSA #: 10919045

Other 2015 Toyota Sienna Issues