2021 CHEVROLET BLAZER — Complaint #2171447
Open-data reference.
NHTSA Complaint about POWER TRAIN filed January 30, 2026
NHTSA complaint #2171447 (ODI reference 11714381) concerns a 2021 CHEVROLET BLAZER and was filed on January 30, 2026. The owner reports the failure occurred on January 7, 2026. The report was geocoded to California based on the filer's self-reported location. The affected component is categorized as power train, 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 BLAZER cohort independently describe similar power train 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 2021 CHEVROLET BLAZER shows the complete component-level complaint distribution alongside any active investigations or recalls.
Complaint Description
Around 55,000 miles, my 2021 Chevrolet Blazer experienced a throttle body failure. The check engine light illuminated and the vehicle entered a reduced power/limp mode condition. Throttle response was significantly limited, and the vehicle could not accelerate normally. While the vehicle remained drivable, it took substantially longer to reach speed, which could pose a safety risk when merging into traffic or crossing intersections. Diagnostic trouble code P2101 (Throttle Actuator Position Performance) was present. A Chevrolet dealer confirmed an internal throttle body failure and replaced the throttle body assembly. This component is a critical engine control system, and failure could affect acceleration and vehicle control, posing a potential safety risk. The failure occurred well before expected service life and required a costly repair. The component has been replaced and is available for inspection upon request. I believe this may represent a premature defect and should be inves
Complaint Details
| NHTSA Complaint ID | 2171447 |
| ODI Number | 11714381 |
| Date Filed | January 30, 2026 |
| Failure Date | January 7, 2026 |
| VIN | 3GNKBHR47MS |
Similar POWER TRAIN Complaints for 2021 CHEVROLET BLAZER
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Source: NHTSA Vehicle Complaints Database. Component taxonomy and severity codes are standardized by NHTSA Office of Defects Investigation.
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