Toyota Sienna owners have reported 2 problems related to lose power steering (under the steering category). The most recently reported issues are listed below. Also please check out the statistics and reliability analysis of Toyota Sienna based on all problems reported for the Sienna.
I have a 2004 Toyota Sienna with approximately 60,000 miles. The steering seems to have lost power steering capabilities as well as over turning when going around curves and corners.
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It happened twice during 2 weeks ago ( during heavy rain). I was driving my 2004 Toyota Sienna on a parking lot. The steering wheel is very hard to turn, it seems like I lost the power steering. After restarting the van, the problem disappeared. Next day, my wife encountered the same problem when she is picking up our kids from school. We believe there is a major problem with the electrical system or computer system. I have so many problem with this vans and the dealer refuse to fix it, I have seat belt problem, it is not easy to release after driving, dealer wants 300 to fix. Electrical sliding door problem etc.