definitely annoying
Crashes / Fires:
0 / 0
Injuries / Deaths:
0 / 0
Average Mileage:
40,250 miles

About These NHTSA Complaints:

This data is from the NHTSA — the US gov't agency tasked with vehicle safety. Complaints are spread across multiple & redundant categories, & are not organized by problem.

So how do you find out what problems are occurring? For this NHTSA complaint data, the only way is to read through the comments below. Any duplicates or errors? It's not us.

2012 Toyota Sienna drivetrain problems

drivetrain problem

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2012 Toyota Sienna Owner Comments

problem #2

Oct 302015


  • 79,000 miles


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 disabled. I repaired damage by running new wires, clearing nests and set traps and poison, but now the the fuel system has been attacked and the fuel pump does not activate. 3 other cars parked in the same location for the past 5 months are untouched. Safety systems are likely to be compromised for any person who must park these outdoors.

- Edmond, OK, USA

problem #1

Feb 152012

Sienna 6-cyl

  • 1,500 miles
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.

- Bayside, NY, USA

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