| Issue ID | 918770 |
| Internal NHTSA # | 10457363 |
| Manufacurer | TOYOTA MOTOR CORPORATION |
| Brand | TOYOTA |
| Model | SIENNA |
| Model Year | 2004 |
| File date | 19/11/11 |
| Component | POWER TRAIN |
| Product type code | VEHICLE |
| Description of the problem | Car rolled back while on a slope with parking brake fully applied, in park, and engine off. Rolled back about 6-9 inches as soon as footbrake was released, with a child immediately behind car at that time. I later found the problem is a worn rear differential front support arm used on all sienna awd's, and likely other toyota's that share the same awd drivetrain design. Per the toyota owner boards, it apparently commonly fails and sells for over $200 for just the part. However, it really concerns me here because when it fails, it allows play in the driveline, which then results in the car being able to roll for 6 inches plus even w/ parking brake applied until it reaches the limit of its play. On a slope and with someone just in front or behind the car that could result in serious injury or even death by either impact or crushing. Dangerous design and poor reliability. |
| Vehicle Mileage at Failure | 120000 |
| Number of Occurences | 1 |
| Source of the issue | NHTSA WEB SITE |
| City and State | MENLO PARK, CA |
| VIN pattern | 5TDBA22C04SXXXXXX |
| Was vehicle invloved in a crash? | N |
| Was vehicle involved in a fire? | N |
| Was incedent reported to police? | N |
| Was medical attention required? | |
| Was part original equipment? | |
| No. of injured persons | |
| No. of fatalities | |
| Date of purchase | 07/08/26 |
| Was original owner? | N |
| Anti-lock brakes | N |
| Cruise control | N |
| Number of cylinders | 6 |
| Drive train type | |
| Transmission type | |
| Vehicle speed | 0 |
| DoT tire identifier | |
| Tire size | |
| Location of tire code | |
| Type of tire failure code | |
| Was defective tire repaired? | |
| Date of manufacture | |
| Type of child seat code | |
| Type of restraint | |
| Dealer's name | |
| Dealer's telephone number | |
| Dealer's city | |
| Dealer's state code | |
| Dealer's ZIP code |