Differential Unit problems of the 2011 Toyota Sienna

Rear differential failed at 143k miles.

Whirring noise from the rear differential while the vehicle is in motion. The pitch of the whir gets higher as the vehicle accelerates. Cause is a faulty bearing in the electromagnetic coupler assembly.

When accelerating vehicle makes loud humming noise. Stops when you take your foot off the gas. I was told it is the rear differential. I have read many complaints about this faulty part. Why is this not being investigated? $2000 repair.

Tl the contact owns a 2011 Toyota Sienna. While driving approximately 25 mph and attempting to turn, a growling noise was heard from the rear of the vehicle without warning. The vehicle was taken to prime Toyota route 2 (978-353-1700, located at 700 old union turnpike, lancaster, MA 01523) to be diagnosed, but the failure could not be duplicated. The failure recurred and the vehicle was taken to an independent mechanic who diagnosed and replaced the rear differential. The failure was remedied. The manufacturer was not made aware of the failure. The failure mileage was approximately 64,000.

The contact owns a 2011 Toyota Sienna. The contact stated that the rear differential coupling failed to function. Colonial Toyota dealer (550 george washington hwy, smithfield, ri 02917, (401) 723-0972) indicated that the part needed to be replaced. The manufacturer stated that the Toyota rav4 various year models had the same part; however, the contact's model vehicle was not yet included in the recall. The contact was uncertain if the vehicle would be repaired. The approximate failure mileage was 86,000.

At appx 50-60k miles, my rear differential began making a loud whirring sound. No specific 'time' of failure. . Just a gradual buzzing noise. Diagnosed as a bearing failure in a coupler from the local Toyota service dept. $2500. 00 fix. Research shows the rav 4 to have had same faulty problem, but there was a recall for rav 4 owners. Why not a recall for Siennas? one would think Toyota would assume Siennas were bought for large families, packed with children, etc, and would place a recall first and foremost. Many people have posted online on forums and youtube about this problem. I have been corresponding to multiple groups in order to bring more attention and action to promote this fault and get proper compensation to get this fixed. The vehicle is very loud, expecially on the highway. Very unsafe.

I'm owner of Toyota Sienna 2011 5 years 2-nd owner 79k miles and experience whirring noise in rear differential after visiting Toyota dealers without any success accept price tag for replacement rear differential coupler. After that do some research and find the other owners experience that same issue find that TSB #TSB-0080-13 NHTSA id #10052631 with model rav4 use this same differential coupler have extra extended warranty because of that issue. How safety right now is car to drive I don't know in my case with 3 kids aboard I will replace that differential coupler on my cost right now, and do some investigation later. Please see upload file with some research I do thank you [xxx] information redacted pursuant to the freedom of information act (foia), 5 u. S. C. 552(b)(6).