2012 Toyota Sienna Power Train Problems
- 9
- Owner complaint records in our dataset
Records are owner complaints, not a measured failure rate.
Owner complaint recordsComplaint records reflect reports in our dataset and do not measure how frequently the problem occurs across all vehicles.
Among these 9 stored complaint records:
- 1 indicate a crash
- 0 indicate injury
- 0 indicate fire
What owners report
- rear differential · 4 records
Mileage in stored records
| Band | Records |
|---|---|
| 60–100k mi | 5 |
| 1–30k mi | 1 |
| 30–60k mi | 1 |
| 150–400k mi | 1 |
Complaint records
Owner-submitted complaint content, presented as stored.
Power Train
My 2012 sienna awd xle has 103k miles and has a whirring noise coming from the rear differential area for a while now. The pitch and volume is proportional to speed and is louder as speed increases. My research tells me this is a common defect with the coupling bearings in front of the rear differential. It seems that rav4 owners got a recall for the same issue, but sienna owners did not. Toyota has redesigned this…
ODI 11287814
Power Train
The bearing for the viscous coupler has gone bad. It whines loudly when in motion, and the volume correlates with the speed. According to feedback from online this issue happens a lot. Toyota will not change the bearing ($50 plus labor). They will only change the whole coupler ($1800 plus labor) as they state the coupler is not serviceable. Multiple people have serviced the working coupler to change just the…
ODI 11307184
Power Train
FRONT AXLE LEAKING FLUID
ODI 11197376
Power Train
Rear differential has failed at only 60k miles. Well documented issue for awd sienna models yet no recall issued. Safety concern for this family of five.
ODI 11196818
Power Train · Service Brakes · Vehicle Speed Control
When coming to a stop going about 5 mph towards a stop sign, my van accelerated into traffic. Because the van jolted me into oncoming traffic, it almost caused an accident. It doesn't seem to matter whether i am braking or coasting, the van will accelerate uncontrollably.i have two children and not only am i putting their lives at risk, but mine also. I am not able to drive this vehicle due to how dangerous it is.
ODI 11175789
Power Train
Rear differential coupler dysfunctional without no reason. All of the sienna especially awd are suffering from this issue.toyota denies to cover it.
ODI 11097881
Power Train
While parked, driver began exiting vehicle and van began to roll and continued to roll when gear shift lever confirmed in park and brake continually pressed, eventually hitting a house.
Crash reported
ODI 11071940
Electrical System · Fuel/Propulsion System · Power Train
All underwood components are not only vulnerable, but attractive to rodents. While parked overnight on 4 consecutive nights, rodents have chewed through wires despite attractive rodent poison in the engine bay, the poison is untouched and the wires are attacked every night. To date injector wires, sensor sires, fuel pump wires have been compromised, including sensors for the stability control system, which is…
ODI 10787185
Engine And Engine Cooling · Power Train · Steering
Joining highway in a situation where vehicles giving way cause hesitation and then give way causing braking then acceleration repeatedly, transmission refused to downshift on kick down, vehicle would not accelerate, actually slowed significantly forcing following vehicles to brake .vehicle eventually began to pick up speed.generally poor response from transmission in all modes. Transmission drops out of drive at low…
ODI 10456744