GMC Sierra 3500HD DTC Codes
Select your year and engine to view applicable diagnostic trouble codes. 🇲🇽 Mexico
27 Configurations
2026
6.6L V8 Duramax Diesel
821 DTC codes
diesel2026
6.6L V8 L8T
971 DTC codes
2025
6.6L V8 Duramax Diesel
821 DTC codes
diesel2025
6.6L V8 L8T
971 DTC codes
2024
6.6L V8 Duramax Diesel
821 DTC codes
diesel2024
6.6L V8 L8T
971 DTC codes
2023
6.6L V8 Duramax Diesel
821 DTC codes
diesel2023
6.6L V8 L8T
971 DTC codes
2022
6.6L V8 Duramax Diesel
821 DTC codes
diesel2022
6.6L V8 L8T
971 DTC codes
2021
6.6L V8 Duramax Diesel
821 DTC codes
diesel2021
6.6L V8 L8T
971 DTC codes
2020
6.6L V8 Duramax Diesel
821 DTC codes
diesel2020
6.6L V8 L8T
971 DTC codes
2019
6.6L V8 Duramax Diesel
821 DTC codes
diesel2018
6.6L V8 Duramax Diesel
821 DTC codes
diesel2017
6.6L V8 Duramax Diesel
821 DTC codes
diesel2016
6.6L V8 Duramax Diesel
821 DTC codes
diesel2015
6.6L V8 Duramax Diesel
820 DTC codes
diesel2014
6.6L V8 Duramax Diesel
816 DTC codes
diesel2013
6.6L V8 Duramax Diesel
814 DTC codes
diesel2012
6.6L V8 Duramax Diesel
814 DTC codes
diesel2011
6.6L V8 Duramax Diesel
803 DTC codes
diesel2010
6.6L V8 Duramax Diesel
803 DTC codes
diesel2009
6.6L V8 Duramax Diesel
767 DTC codes
diesel2008
6.6L V8 Duramax Diesel
767 DTC codes
diesel2007
6.6L V8 Duramax Diesel
740 DTC codes
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