General Motors is addressing an issue that may cause check engine lights on 2020/2021 Diesel Silverado and Sierra pickups. Both 3.0L and 6.6L Diesel Duramax engines could have an error related to the emission and/or exhaust fluid systems.
Technical Service Bulletin: #21-NA-07
Release Date: 1/20/2021
Vehicles Covered Under This TSB
Editor's Note: We're taking an effort to expand our vehicle review coverage to include models that compete head to head with General Motors product. This is our third competitive review in the last month with more on the way. Enjoy.
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