This service bulletin explains how to identify possible DEF system contamination.
Chevrolet technical service bulletin 19-NA-237 for 2011-2024 Chevrolet Silverado 1500, 2021-2024 Chevrolet Tahoe and 2018-2019, 2022 Chevrolet Equinox and others.
- Bulletin number
- 19-NA-237
- Component
- Engine
- Summary
- This service bulletin explains how to identify possible DEF system contamination.
Owners of these vehicles have filed 7,960 complaints in the engine category.
Vehicles covered
- Chevrolet Silverado 1500 2011-2024 20172018201920202021202220232024
- Chevrolet Tahoe 2021-2024 2021202220232024
- Chevrolet Equinox 2018-2019, 2022 201820192022
- GMC Sierra 1500 2011-2024 20172018201920202021202220232024
- Chevrolet Suburban 2021-2022, 2024 202120222024
- GMC Yukon 2021-2024 2021202220232024
- Chevrolet Silverado 2500 2019-2025 2019202020212022202320242025
- Chevrolet Cruze 2014-2015, 2017-2019 20142015201720182019
- Chevrolet Colorado 2016-2022 2016201720182019202020212022
- GMC Yukon XL 2021-2024 2021202220232024
- GMC Sierra 2500 2019-2024 201920202021202220232024
- Cadillac Escalade 2021-2024 2021202220232024
- Chevrolet Suburban 1500 2021-2024 2021202220232024
- Chevrolet Silverado 3500 2019-2024 201920202021202220232024
- Chevrolet Express 2010-2021 20142015201620172018201920202021
- GMC Sierra 3500 2019-2024 201920202021202220232024
- Cadillac Escalade ESV 2021-2023 202120222023
- GMC Savana 2010-2022 20152016201720182019202020212022
- GMC Yukon XL 1500 2023 2023
- GMC Sierra Denali 2019-2020 20192020
- Chevrolet Express 3500 2010, 2012, 2014 201020122014
- Chevrolet Express 1500 2010-2012, 2014 2010201120122014
- Cadillac XT4 2020-2023 2020202120222023
- Chevrolet Express 2500 2010-2011, 2014, 2017-2018 20102011201420172018
- GMC Savana 1500 2010-2017 20102011201220132014201520162017
- GMC Savana 3500 2010-2018 20112012201320142015201620172018
- GMC Savana 2500 2010-2018 20112012201320142015201620172018
- Chevrolet Express Cutaway Van 2010-2022 20152016201720182019202020212022
- Chevrolet Express 4500 2012, 2014, 2016 201220142016
- Chevrolet Silverado 5500 2019-2021, 2023-2024 20192020202120232024
- Chevrolet Silverado 4500 2019-2024 201920202021202220232024
- Chevrolet Express Cutaway 2013 2013
- Chevrolet Silverado 6500 2019, 2021-2023, 2025 20192021202220232025
- Chevrolet 6500 2019 2019
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