One problem related to transmission slip out of gear has been reported for the 2012 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2012 Toyota Sienna based on all problems reported for the 2012 Sienna.
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 speeds causing engine to race before taking up drive, very hard to operate vehicle smoothly. . Excessive engine vibration and noise for this price point ,known more refined diesels knocking from steering column on constant radius turns when making small steering corrections, detectable at low and moderate to high speed.
| Power Train problems | |
| Differential Unit problems | |
| Transmission Slip Out Of Gear problems | |
| Driveshaft problems | |
| Transmission Fluid Leaking problems |