What's Wrong with the 2nd Generation (2004–2010) Sienna?

Sienna owners have made 620 complaints about the 2004–2010 model years. Using our PainRank™ system we've ranked it 78th out of 81 Toyota generations in overall reliability, with real interior and body concerns.

Compare With Other Sienna Generations

Common 2004-2010 Toyota Sienna Problems

Some of the worst issues 2nd generation Sienna owners have to deal with.

  1. Oil Sludge in Toyota Engines

    Toyota settled a class-action engine-sludge suit in 2007 that covered an estimated 2.5-million Toyota and Lexus vehicles made between 1997 and 2002. In that case, Toyota agreed to repair 'sludged-up' engines for up to eight years from the t…

    Continue reading article "Oil Sludge in Toyota Engines"

What Owners Complain About

Sometimes it helps just to tally up the complaints and see where the biggest stacks are. Use this information to learn about troublespots or to run for the hills.

Worst Issues

What Breaks the Most

Years to Avoid

2nd Generation (2004–2010) Sienna Key Numbers

  1. 7 model years

    Grouping all models by their year can reveal some baddies.

  2. 620 complaints

    Running tally of owner grievances filed to CarComplaints.com.

  3. 78th in reliability

    Overall reliability rank out of 81 eligible generations.

Recent 2nd Generation (2004–2010) Sienna News

There's a lot of news out there, but not all of it matters. We try to boil down it to the most important bits about things that actually help you with your car problem. Interested in getting these stories in an email? Signup for free email alerts over at CarComplaints.com.

  1. Toyota has blamed a musty A/C smell on microbes [i.e., mold] growing o the evaporator surface and now a lawsuit wants them to do something about it.

    The plaintiffs claim the vehicles have defective heating, ventilation and air conditioning (HVAC) systems that cause smells and health problems from mold that collects on the evaporators. Numerous complaints have allegedly been filed with the government, Toyota and Lexus dealerships nationwide since at least 1999.

    This isn't the first time Toyota has been sued for musty A/C units.

    keep reading article "Air Conditioner Lawsuit Complains About Mold Smell From Toyota HVAC"

  2. How hot do you like your seat heater in the winter?

    If you like it really toasty — as in, with an actual flame — you’ll probably love one of 7,700 Toyota vehicles with seat heaters that catch on fire. The vehicles have been recalled because fire and cars don’t get along, what with their tanks of highly flammable liquids and all. All the affected vehicles are equipped with aftermarket accessory seat heaters that contain copper strand heating elements. The recall is being handled by Southeast Toyota Distributors (SET) which is the world’s largest distributor of Toyota and Scion vehicles.

    The recall is expected to begin on July 14, 2016 and the seat heaters will need to be disconnected. Owners will be reimbursed.

    keep reading article "Toyota Wants to Stop Seat Heaters From Setting Owner's Buns on Fire"

  3. Can't find your Sierra's spare tire? Don't drive yourself crazy, it might have fallen off somewhere down the road.

    The spare tire, which is mounted beneath the minivan, is protected by a splash guard that Toyota admits can fall off with "normal usage". Maybe try extreme usage next time? If you live in a state that uses a lot of road salt in the winter, a missing splash guard means three things:…

    keep reading article "Honey, Where'd You Put the Sierra's Spare?"