NHTSA Complaint #11712266 — 2021 GMC SIERRA 1500

ENGINE issue reported to NHTSA

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Complaint Details

ODI Number	11712266
Vehicle	2021 GMC SIERRA 1500
Component	ENGINE
Date of Incident	January 20, 2026
Date Filed	January 20, 2026
Mileage	N/A miles
Crash	No
Fire	No
Injuries	0
Deaths	0
Vehicle Towed	No
State	CA

Consumer Description

The engine has a knocking sound. I took it into the dealer and they replaced the exhaust system thinking that was the problem. However, the knocking still happens intermittently. I have video documentation of the noise.

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