| Issue ID | 770609 |
| Internal NHTSA # | 10314544 |
| Manufacurer | TOYOTA MOTOR CORPORATION |
| Brand | TOYOTA |
| Model | SIENNA |
| Model Year | 2005 |
| File date | 12/02/10 |
| Component | ELECTRICAL SYSTEM |
| Product type code | VEHICLE |
| Description of the problem | The electronic throttle control system on my van is malfunctioning and it puts the vehicle in "fail safe" mode. The local toyota dealer as well as toyota customer service do not want to investigate this recurring problem for the dtc p0121. The dealers do not analyze the freeze frame data or investigate the problem beyond reading the code from obd ii scanner. I had asked them for the electrical values for the throttle valve motor and the accelerator pedal but they have refused that information and want me to replace the throttle body by spending $1200. 00. The first time this problem started when the vehicle had 50,000 miles and i replaced the throttle body from same year and model vehicle with 20,000 miles. Now after 10,000 miles same problem has started again and the dealer as well as toyota want me to replace the throttle body. I feel that the throttle body or the gas pedal in conjunction with other electrical components are causing the dtc code and merely replacing the throttle body second time will not fix the problem unless the newer throttle bodies are without the problem original throttle bodies had. In that case i should not have to pay for the replacement part. It is important that the problem is investigated and identified before any parts are replaced. I also offered toyota the original throttle body from the vehicle for testing / checking for the problem but they refused my offer. This sudden loss of drivebility due to the activation of "fail safe" mode is dangerous and could result in accident and / or fatality. Any help in this matter will be appreciated. |
| Vehicle Mileage at Failure | 50000 |
| Number of Occurences | 1 |
| Source of the issue | NHTSA WEB SITE |
| City and State | APOLLO BEACH, FL |
| VIN pattern | 5TDZA23C95SXXXXXX |
| 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 | |
| Drive train type | |
| Transmission type | |
| Vehicle speed | 45 |
| 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 |