2021 GMC SIERRA 1500 — Complaint #2104252
Open-data reference.
NHTSA Complaint about ENGINE AND ENGINE COOLING:ENGINE:CRANK/CAMSHAFT POSITION SENSOR filed June 26, 2025
NHTSA complaint #2104252 (ODI reference 11669496) concerns a 2021 GMC SIERRA 1500 and was filed on June 26, 2025. The owner reports the failure occurred on May 15, 2025. The vehicle had 83,000 miles on the odometer at the time of the incident. The report was geocoded to New Mexico based on the filer's self-reported location. The affected component is categorized as engine and engine cooling:engine:crank/camshaft position sensor, 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 GMC SIERRA 1500 cohort independently describe similar engine and engine cooling:engine:crank/camshaft position sensor 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 GMC SIERRA 1500 shows the complete component-level complaint distribution alongside any active investigations or recalls.
Complaint Description
The contact owns a 2021 GMC Sierra 1500. The contact stated that occasionally while attempting to start the vehicle, the engine hesitated to turn over. The contact stated that the failure progressed, and the vehicle no longer started as needed. The check engine warning light was illuminated. The contact stated that two local dealers were contacted; however, the contact was advised that to diagnose or repair the vehicle, might take several months. The vehicle was towed to a local independent mechanic, where it was diagnosed with camshaft sensor failure. The vehicle was not repaired. The manufacturer was not made aware of the failure. The failure mileage was approximately 83,000.
Complaint Details
| NHTSA Complaint ID | 2104252 |
| ODI Number | 11669496 |
| Date Filed | June 26, 2025 |
| Failure Date | May 15, 2025 |
| VIN | 3GTP8DET6MG |
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.