fairly significant
Typical Repair Cost:
No data
Average Mileage:
15,250 miles
Total Complaints:
2 complaints

Most Common Solutions:

  1. not sure (2 reports)
2010 Toyota Sienna engine problems

engine problem

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2010 Toyota Sienna Owner Comments

problem #2

Sep 022012

Sienna LE 3.5L V6

  • Automatic transmission
  • 25,500 miles


Toyota dealer doesn't want to fix. They said normal. I don't think it is normal.

- , Fremont, CA, USA

problem #1

Feb 022010

Sienna LX 3.5L

  • Automatic transmission
  • 5,000 miles

Purchased New had it serviced at the dealer and has always had this knocking when engine is cold. The dealers and the Toyota head office tech representative say it is PISTON SLAP and it is normal. The knocking is getting worse as more miles are on the vehicle. Piston slap is a serious problem in the long run. It can cause rings to break, scratches in the cylinder and much more problems. I expected the car to last to 200,000 miles, I do not think it will, private mechanics do not like the sound of the PISTON SLAP. Every time the engine is cold I have to run it till it is warm before driving it. Its a pain in the ...

Not to my expectations of a TOYOTA.

Update from Mar 13, 2014: 95,000 miles Piston Slap still a problem. Engine sounds like a Diesel engine. Toyota says its normal. It takes 15 minutes of warm up for the noise to go away. Normal????, if its normal then they designed it to have piston slap and all would do it. Toyota does not back up its products. If you must buy a Toyota good luck and I recommend you purchase an extended warranty.

- , Mission Viejo, CA, US

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