This technical bulletin provides the tech with a procedure to check if the transmission is the
Chevrolet technical service bulletin 21NA120 for 2020-2021 Chevrolet Silverado 2500 and 2020-2021 GMC Sierra 2500.
- Bulletin number
- 21NA120
- Component
- Power train
- Summary
- This technical bulletin provides the tech with a procedure to check if the transmission is the cause of the concern by checking the data.
Owners of these vehicles have filed 101 complaints in the transmission category.
Vehicles covered
- Chevrolet Silverado 2500 2020-2021 20202021
- GMC Sierra 2500 2020-2021 20202021
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