2004 TOYOTA SIENNA — Complaint #2149276
Open-data reference.
NHTSA Complaint about ENGINE AND ENGINE COOLING:ENGINE:ENGINE CONTROL MODULE (ECU/ECM) filed November 17, 2025
NHTSA complaint #2149276 (ODI reference 11699794) concerns a 2004 TOYOTA SIENNA and was filed on November 17, 2025. The owner reports the failure occurred on November 10, 2025. The vehicle had 150,132 miles on the odometer at the time of the incident. The report was geocoded to Pennsylvania based on the filer's self-reported location. The affected component is categorized as engine and engine cooling:engine:engine control module (ecu/ecm), one of NHTSA's standardized taxonomy codes used to group defect patterns across make, model, and year.
The filer flagged the following severity indicators: crash: no, fire: no, injuries: 0, fatalities: 0. No crash, fire, or fatality was associated with this report, which places it in the early-warning stream rather than the priority-review stream. Because a VIN was supplied, this complaint is tied to a specific vehicle and not just a model-year cohort.
Individual complaints are consumer-submitted and unverified by NHTSA engineers — the agency's role at this stage is to collect, index, and make them searchable. What matters for federal action is the pattern: when many owners of the same TOYOTA SIENNA cohort independently describe similar engine and engine cooling:engine:engine control module (ecu/ecm) failures, defect investigators have grounds to open a PE and request manufacturer data. Related filings for the same vehicle and component appear below, and the detail page for the full 2004 TOYOTA SIENNA shows the complete component-level complaint distribution alongside any active investigations or recalls.
Complaint Description
The contact's mother owns a 2004 Toyota Sienna. While the contact's mother was driving at an undisclosed speed, several unknown warning lights illuminated. The contact stated that the warning lights illuminated on and off for days and months. The vehicle was taken to an independent mechanic where DTC: P2241 was retrieved. The vehicle was not repaired. The contact was advised to take the vehicle to the dealer. The vehicle was taken to the dealer where the failure code was confirmed. The contact was informed that the oxygen sensors needed to be replaced. In addition, the contact was informed that a TSB for the ECM software update needed to be performed. The contact stated that the vehicle was not repaired because the ECM software update was performed, and the ECM software update damaged the ECM. The manufacturer was made aware of the failure and a case was filed. The failure mileage was approximately 150,132.
Complaint Details
| NHTSA Complaint ID | 2149276 |
| ODI Number | 11699794 |
| Date Filed | November 17, 2025 |
| Failure Date | November 10, 2025 |
| VIN | 5TDZA23C34S |
Source: NHTSA Vehicle Complaints Database. Component taxonomy and severity codes are standardized by NHTSA Office of Defects Investigation.
Read our methodology — how this data is sourced, computed, and verified.