2012 Toyota Sienna Engine Problems
3 owner-reported engine complaints from NHTSA data
Data sourced from NHTSA public database. For informational purposes only. Always consult a qualified mechanic.
Owner Complaints (3)
Your engine is leaking coolant from the rear of the engine through the head gasket, which is causing your vehicle to struggle when accelerating beyond 55 mph. This appears to be a known issue affecting 3.5L V6 engines in Toyota models from 2011-2017. The fix will likely involve replacing the head gasket and addressing the source of the leak.
Parts you may need:
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TL* THE CONTACT OWNS A 2012 TOYOTA SIENNA. WHILE DRIVING VARIOUS SPEEDS, A KNOCKING NOISE WAS PRESENT COMING FROM THE ENGINE. THE CAUSE OF THE FAILURE WAS NOT DETERMINED. THE MANUFACTURER WAS NOT NOTIFIED OF THE FAILURE. THE VIN WAS NOT AVAILABLE. THE FAILURE MILEAGE WAS 70,000.
TL* THE CONTACT OWNS A 2012 TOYOTA SIENNA. THE CONTACT STATED THAT WHILE DRIVING 75 MPH, THE VEHICLE STALLED WITHOUT WARNING. THERE WAS NO BRAKING POWER AND AS THE CONTACT ATTEMPTED TO GUIDE THE VEHICLE OFF THE ROADWAY, HE CRASHED INTO A CURB. THE HORN THEN BEGAN TO SOUND AS SMOKE FILLED THE INTERIOR CABIN. THE SIX OCCUPANTS OF THE VEHICLE BECAME TRAPPED INSIDE AND WERE ABLE TO CLIMB OUT OF A PARTIALLY OPENED WINDOW AS THE VEHICLE BECAME ENGULFED IN FLAMES WITHIN MINUTES. THE VEHICLE WAS DESTROYED, THERE WERE NO INJURIES AND A POLICE REPORT WAS NOT FILED. THE VEHICLE WAS NOT INSPECTED TO DETERMINE THE CAUSE OF THE FAILURE OR THE FIRE. THE FAILURE AND CURRENT MILEAGE WAS 23,000.