2015 Toyota Sienna engine problems: valve cover gasket leaking oil

Valve Cover Gasket Leaking Oil

2015 Toyota Sienna

This problem may be covered under warranty. Ask your Toyota dealer.

CarComplaints.com Notes: Toyota says the 2015 Sienna has been redesigned with "more swagger." Let's hope it's also been redesigned with less seat noise.


really awful
Typical Repair Cost:
Average Mileage:
38,000 miles
Total Complaints:
2 complaints

Most Common Solutions:

  1. replace gasket (2 reports)
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2015 Toyota Sienna engine problems

engine problem

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2015 Toyota Sienna Owner Comments

problem #2

Aug 212017


  • Automatic transmission
  • 75,187 miles


I have had 5 Toyota Cars- 4 Siennas and paid a premium for reliability. It is crazy to be looking at a $2000 repair after only 2 years. This has to be an issue with the Sienna but dealer no help. Looks like my last Toyota.

- Twyla M., Jackson, US

problem #1

Jan 252016

Sienna Le 8-pass 3.5L V6

  • Automatic transmission
  • 789 miles

click to see larger images

valve cover gasket leaking oil valve cover gasket leaking oil valve cover gasket leaking oil

Bought this brand new 2015 Sienna on Dec 28, 2015. Picked it up on Dec 31,2015. On the third day, felt vibration at 1250- 1400 RPM. Sometimes will also have drone noise when driving at a speed at 20-35 Km/h. I brought it to the dealer on Jan 12,2016. They found nothing abnormal, so they told me that this is normal behavior for a 2015 Sienna. Tried another new Sienna on their lot, did the same thing. After a few days, I experienced a rattle noise. So I brought it to dealer today for a inspection for the drone and rattle noise. To my surprise, the technician found there is oil leaking from the front engine valve cover gasket.( as they said, I am not a mechanic). So I have to leave the car in their garage. They promised that they will fix it tomorrow morning.

I bought this new Sienna just because I had believed that Toyota was the most reliable car maker. But I know I was definitely wrong!!!

- haishan, Kitchener, ON, Canada

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