2013 Toyota Sienna Transmission Problems

Your 2013 Sienna developed a loud humming noise from the rear differential area, which your dealer identified as a faulty electromagnetic control unit. You had a lifetime powertrain warranty, but the warranty company delayed approval, requested extensive documentation, and ultimately demanded a third-party inspection after you'd already had the repair completed — effectively denying coverage. You ended up paying over $2,500 out of pocket for a repair that should have been warranty-covered.

Your Sienna's engine is leaking oil from the front timing cover. The leak is slow but ongoing, and you're concerned it could worsen over time and potentially cause your engine to break down, especially given your vehicle's relatively low mileage. Fixing this will likely involve removing the timing cover and replacing the gasket or seal that's causing the leak.

Grinding noise began from the rear of the vehicle increasing as acceleration increased. Took to the shop and found at the Rear Differential failed at 75,000 requiring replacement for thousands of dollars. The same year RAV4 has been recalled for this already - the Sienna should have a recall also. The dealership had the part on the shelf, surprise surprise.

I have been notified by my Toyota dealership that the rear viscous coupler on my Sienna has failed and that the RAV4s have been recalled for this same part as a safety issue ( years ago). This part is a known manufacturing defect. Forums are wallpapered with complaints about this for years, I've already lodged a complaint with Toyota but they are doing nothing. Customers should not be on the hook for a $2500 repair that is a known manufacturing defect. The coupler recall should be extended to the Siennas!

THE REAR DIFFERENTIAL IS CAUSING A WHIRLING SOUND. THE SOUND ONLY OCCURS WHEN THE VEHICLE IS ON DRIVE. I DON'T HEAR THE SAME HIGH PITCHED WHIRLING SOUND WHEN THE CAR IS IN REVERSE. THIS IS A COMMON PROBLEM WITH THIS GENERATION OF SIENNA. TOYOTA HAS A RECALL FOR THIS ISSUE ON THE RAV 4 BUT NOT THE SIENNA.

VAN STARTED HAVING A PROPANE/MUSTY SMELL INSIDE CABIN WHILE DRIVING ON HIGHWAY. VAN JUST HAD CABIN FILTERS REPLACED AND AUTO SHOP STATED THE REAR DIFFERENTIAL AND COUPLER WERE BLOWN AND TO GET A USED PART AND REPLACE IT WOULD BE $4300. THE VAN IS A 2013 WITH 86,000 MILES ON IT. THE RAV-4 HAS THE EXACT SAME PART UNDER A RECALL. HOW DIFFERENT COULD THE PARTS BE IN THE SAME COMPANY FOR 2 VEHICLES LIKE THIS? IT SEEMS LIKE TOYOTA SHOULD BE ISSUING A RECALL FOR THIS PROBLEM AS I JUST READ ABOUT 6 OTHER PEOPLE WHO HAD THE EXACT SAME PROBLEM IN THE LAST 6 MONTHS ALONE ALL WITH VEHICLES WITH RELATIVELY LOW MILEAGE. THIS IS A DISSERVICE TO LOYAL TOYOTA CUSTOMERS AND A HUGE SAFETY ISSUE TO PEOPLE DRIVING THEIR FAMILIES IN THESE MINI-VANS.

REAR COUPLER FOR REAR DIFFERENTIAL BEARINGS ARE GRINDING CREATING WHIRRING NOISE AND NEED TO BE REPLACED BY DEALER. *TR

NOISE FROM REAR DIFFERENTIAL. BEARING IN THE VISCOUS COUPLER APPEARS TO BE BAD AND A COMMON ISSUE-TOO COMMON FOR THIS TO NOT BE A RECALL.

THE REAR DIFFERENTIAL COUPLING WAS WORN ON MY CAR. THERE HAD BEEN A RECALL FOR THIS PROBLEM ON THE RAV-4 BUT NOT ON THE SIENNA. I BELIEVE THIS IS A DEFECT THAT SHOULD BE LOOKED INTO. I WAS IN THE DEALERSHIP AND QUOTED ME $2,500 FOR MY SIENNA WITH ONLY 40K MILES ON MY CAR THIS IS A MAJOR PROBLEM TO GET INTO WITH THIS LITTLE MILAGE ON IT. THE REAR DIFFERENTIAL CAUSED A VERY LOUD NOISE IN THE CAR THAT MADE IT

THE REAR DIFFERENTIAL COUPLING WAS WORN ON MY CAR. THERE HAD BEEN A RECALL FOR THIS PET ON THE RAV-4 BUT NOT ON THE SIENNA. I BELIEVE THIS IS A DEFECT THAT SHOULD BE LOOKED INTO. THE REAR DIFFERENTIAL CAUSED A VERY LOUD NOISE IN THE CAR THAT MADE IT ALMOST IMPOSSIBLE TO HAVE A CONVERSATION FROM THE THIRD ROW TO THE FRONT SEAT.

REAR DIFFERENTIAL- VISCOUS COUPLER MAKING A WHIRRING NOISE WHILE DRIVING. TOYOTA RAV4 WAS ISSUED A RECALL FOR THE SAME PROBLEM. TOYOTA SIENNA NEEDS ONE AS WELL. IT IS A COMMON FAILURE OF THE BEARING PARTS.

THE REAR DIFFERENTIAL BEARING STARTED MAKING A GREAT DEAL OF NOISE PROPORTIONAL TO SPEED OF VEHICLE. THIS IS A SAFETY PROBLEM. PART MUST BE REPLACED AT COST OF NEARLY $3,000. VEHICLE ONLY HAS 65,000 MILES AND IS ONLY 2 MONTHS OUT OF WARRANTY. RESEARCH I HAVE DONE REVEALS THAT THIS IS A COMMON PROBLEM WITH THIS VEHICLE. THE DEALER HAD THE PART IN STOCK, WHICH ALSO SUGGESTS THAT THIS IS A COMMON PROBLEM. A RECALL WAS DONE FOR RAV4. A RECALL SHOULD BE DONE FOR THE SAME ISSUE FOR THE SIENA.

REAR DIFFERENTIAL MAKING A GROWLING NOISE. WAS TOLD BY TOYOTA THAT THE VISCOUS COUPLER BEARING IS BAD. COST TO REPLACE COUPLER IS FROM $1900.00 TO $3000.00 DOLLARS. CAR ONLY HAD 115000 MILE ON IT WHEN IT STARTED TO MAKE NOISE. BOUGHT A USED REAR END WITH 69000 MILES ON IT AND AGAIN IT TO IS STARTING TO MAKE THE SAME NOISE AT JUST OVER 100000. WHAT IS UP WITH YOUR REAR ENDS. I CAN'T AFFORD ANOTHER ONE. IS THERE A RECALL?THAT REAR END IS ONLY 1YR. OLD. OUT OFF WARRANTY

THE VISCOUS COUPLING ON THE REAR AXLE OF MY AWD SIENNA STARTED MAKING NOISE AND NEEDED TO BE REPLACED. APPARENTLY THERE HAS BEEN A RECALL FOR THE RAV4 FOR THE SAME PART, BUT NOT THE SIENNA. MY AUTO SHOP HAS TOLD ME THIS IS A FAIRLY COMMON PROBLEM. THE BEARINGS IN THE COUPLING FAIL AND START TO MAKE A VERY LOUD WHINE. TOYOTA SAYS THE BEARINGS CANNOT BE REPLACED AND MUST BE SERVICED AS A UNIT... TO THE TUNE OF $2300 PARTS AND LABOR.