One problem related to check engine light on has been reported for the 2006 Toyota Sienna. The most recently reported issues are listed below. Please also check out the statistics and reliability analysis of the 2006 Toyota Sienna based on all problems reported for the 2006 Sienna.
Check engine light, vsc light, traction control light. All 3 lights came on at same time. They say it's the gas cap, it's not the gas cap, they say to reset it, that doesn't work. I was driving home, nothing happened, the lights just came on. No warning sound, nothing to indicate there was a problem, my car seems to drive just fine, but the lights won't go off, and I have 3 kids that I take and pick up from school.