2009 CHEVROLET IMPALA — Complaint #1904084
Open-data reference.
NHTSA Complaint about VEHICLE SPEED CONTROL:THROTTLE:THROTTLE POSITION SENSOR (TPS) filed June 22, 2023
NHTSA complaint #1904084 (ODI reference 11528363) concerns a 2009 CHEVROLET IMPALA and was filed on June 22, 2023. The owner reports the failure occurred on June 22, 2023. The vehicle had 169,000 miles on the odometer at the time of the incident. The report was geocoded to Michigan based on the filer's self-reported location. The affected component is categorized as vehicle speed control:throttle:throttle position sensor (tps), 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 CHEVROLET IMPALA cohort independently describe similar vehicle speed control:throttle:throttle position sensor (tps) 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 2009 CHEVROLET IMPALA shows the complete component-level complaint distribution alongside any active investigations or recalls.
Complaint Description
The contact owns a 2009 Chevrolet Impala. The contact stated that while driving at an undisclosed speed on separate occasions, the messages âReduce Engine Powerâ and "Service Traction Control" were displayed on the instrument cluster, and the check engine warning light was illuminated. Additionally, the contact stated that the failure reoccurred while driving on a bumpy road surface and while turning the steering wheel. The vehicle was taken to an independent mechanic, where it was diagnosed that the throttle position sensor had failed and needed to be replaced. The vehicle was repaired; however, the failure recurred. The contact stated that her father used an OBD reader and retrieved codes indicating that the throttle position sensor was faulty and needed to be replaced. The vehicle was repaired; however, the failure persisted. The contact stated that while driving at an undisclosed speed, the vehicle decelerated unintendedly. The vehicle was taken to an unknown dealer, who inform
Complaint Details
| NHTSA Complaint ID | 1904084 |
| ODI Number | 11528363 |
| Date Filed | June 22, 2023 |
| Failure Date | June 22, 2023 |
| VIN | 2G1WT57K891 |
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.