NHTSA Complaint #11643359 — 2021 CHEVROLET TAHOE

POWER TRAIN issue reported to NHTSA

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Complaint Details

ODI Number	11643359
Vehicle	2021 CHEVROLET TAHOE
Component	POWER TRAIN
Date of Incident	February 13, 2025
Date Filed	February 18, 2025
Mileage	N/A miles
Crash	No
Fire	No
Injuries	0
Deaths	0
Vehicle Towed	No
State	MD

Consumer Description

Valve body for 10 speed transmission suddenly malfunctioned while driving on I-95 at 60mph causing rear wheels to lock up for couple of seconds. Then, Engine rpm went to 5000. Error message displayed"reduced acceleration, drive with care" and "Unable to shift soon, service transmission soon". Upon taking to dealer, service advisor mentioned that it could be valve body issue. which is very common for these vehicles. After diagnosis from dealer, there were two codes: P0770 and P0776. Upon some research it was found that these issues are indeed very common for 10speed GM transmission. But, GM hasn't done much to address it. GM acknowledged the issue in their Oct, 2023 bulletin. This is a safety issue especially at highway speeds.

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