Complaint 2212937

Complaint Summary

POWER TRAIN

Owner Narrative

The failure involved the transmission valve body control valve within the automatic transmission system of the 2021 Chevrolet Suburban, a critical component responsible for regulating hydraulic pressure and controlling gear shifting. The malfunction caused erratic and unreliable shifting behavior, including hesitation, harsh engagement, and loss of proper acceleration; the failed component is in the custody of Northside Chevy in San Antonio, TX. This issue created a significant safety risk, as the unpredictable transmission response impacted the driver’s ability to accelerate when necessary (merging onto high traffic roads) and increased the likelihood of dangerous situations like rear-end collisions or loss of control. The problem was confirmed by an authorized Chevrolet dealer, where diagnostic testing identified faults in the transmission control system and verified the failure through performance testing and fault codes. The vehicle has been inspected by the dealership service department, though it has not been directly examined by the manufacturer, law enforcement, or insurance representatives; however, documentation of the diagnosis is being withheld by the dealership. Prior to the failure there were no warning signs present. Only after failure did the check engine light illuminate, transmission-related warning messages, and noticeable symptoms such as hard shifting, delayed engagement, and slipping, which appeared shortly before the complete failure and significantly worsened over the three-mile drive to the dealership.

Owner-submitted narrative on file with NHTSA. Complaint narratives are self-reported and have not been verified.