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2026 GMC SIERRA 1500 — Complaint #2176170

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NHTSA Complaint about POWER TRAIN filed February 12, 2026

NHTSA complaint #2176170 (ODI reference 11717546) concerns a 2026 GMC SIERRA 1500 and was filed on February 12, 2026. The owner reports the failure occurred on February 8, 2026. The report was geocoded to Texas 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 GMC SIERRA 1500 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 2026 GMC SIERRA 1500 shows the complete component-level complaint distribution alongside any active investigations or recalls.

Vehicle
2026 GMC SIERRA 1500
Component
POWER TRAIN
State
Texas

Complaint Description

My 2026 GMC AT4 3.0L Duramax had a catastrophic engine failure on Sunday, February 8, 2026. It went into reduced acceleration and also fault code PO6DD. Thankfully I was not on a highway. The truck would not run over 45 MPH on flat ground, and then by the time I got it to a safe location 5 miles away it would not run over about 30MPH. This obviously resulted in the truck being towed to a dealership. I have been told the entire engine will be replaced. Upon further reading, I suspect this is a thrust bearing failure that is a well-known issue in this LZ0 Duramax engine. What I have read, this issue is occurring mostly on trucks built from May-Sept 2025, and my truck has a 7/2025 build date. This could have been major safety hazard if the engine had failed in a major freeway/highway.

Complaint Details

NHTSA Complaint ID 2176170
ODI Number 11717546
Date Filed February 12, 2026
Failure Date February 8, 2026
VIN 3gtuuee87tg

Similar POWER TRAIN Complaints for 2026 GMC SIERRA 1500

Source: NHTSA Vehicle Complaints Database. Component taxonomy and severity codes are standardized by NHTSA Office of Defects Investigation.