There are 1 owner-reported driver assist & adas complaints for the 2004 Toyota Siennain NHTSA's database. These are unverified consumer reports and may not reflect confirmed defects.
While driving at approximately 30 to 50 MPH, on dry and smooth pavement, usually going on or off ramp to the left, the skid control engaged and warning sound came on, automatic brake takes over and start braking the van uncontrollably, pulling the vehicle to the right and nearly causing accidents.
Complaints are unverified consumer reports submitted to NHTSA. A high complaint count may reflect vehicle popularity, not defect severity. Data sourced from NHTSA public records.
Data synced from NHTSA on Apr 26, 2026