2021 FORD BRONCO SPORT — Complaint #2150746
Open-data reference.
NHTSA Complaint about POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT filed November 21, 2025
NHTSA complaint #2150746 (ODI reference 11700762) concerns a 2021 FORD BRONCO SPORT and was filed on November 21, 2025. The owner reports the failure occurred on November 14, 2025. The vehicle had 81,421 miles on the odometer at the time of the incident. The report was geocoded to North Carolina based on the filer's self-reported location. The affected component is categorized as power train:driveline:differential unit, 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 FORD BRONCO SPORT cohort independently describe similar power train:driveline:differential unit 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 FORD BRONCO SPORT shows the complete component-level complaint distribution alongside any active investigations or recalls.
Complaint Description
The contact's son owns a 2021 Ford Bronco Sport. While the contact's son was driving at an undisclosed speed, the driver heard an abnormal grinding sound coming from the rear differential. The check engine warning light was illuminated. The vehicle was taken to the dealer, where it was diagnosed with a failed vent tube and water intrusion. The contact was informed that the water intrusion damaged the clutch and gears. The contact was informed that the rear differential and vent tube needed to be replaced. The vehicle was being repaired. The manufacturer was made aware of the failure, and a case was filed. The contact was provided a discount on the cost of the part. In addition, the contact was informed that the failure was a known failure with the model vehicle; however, a recall had not been initiated. The failure mileage was approximately 81,421.
Complaint Details
| NHTSA Complaint ID | 2150746 |
| ODI Number | 11700762 |
| Date Filed | November 21, 2025 |
| Failure Date | November 14, 2025 |
| VIN | 3FMCR9B63MR |
Similar POWER TRAIN:DRIVELINE:DIFFERENTIAL UNIT Complaints for 2021 FORD BRONCO SPORT
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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.