Chevrolet 6500 2017–2021 — technical service bulletin
Bulletin 19NA187 · NHTSA communication 10183171 · issued Oct 28, 2020
Technical service bulletin
communication type
Power Train
component
2017–2021
model years
31
vehicle entries
Official summary
This bulletin provides additional information on how to graph a cylinder misfire and a possible diagnostic cause.
Vehicles covered
- 2019 Chevrolet 6500
- 2019 Chevrolet Duplicate Silverado 5500
- 2017 Chevrolet Silverado 1500
- 2018 Chevrolet Silverado 1500
- 2017 Chevrolet Silverado 2500
- 2018 Chevrolet Silverado 2500
- 2019 Chevrolet Silverado 2500
- 2020 Chevrolet Silverado 2500
- 2021 Chevrolet Silverado 2500
- 2017 Chevrolet Silverado 3500
- 2018 Chevrolet Silverado 3500
- 2019 Chevrolet Silverado 3500
- 2020 Chevrolet Silverado 3500
- 2021 Chevrolet Silverado 3500
- 2019 Chevrolet Silverado 4500
- 2020 Chevrolet Silverado 4500
- 2020 Chevrolet Silverado 5500
- 2019 Chevrolet Silverado 6500
- 2017 GMC Sierra 1500
- 2018 GMC Sierra 1500
- 2019 GMC Sierra 1500
- 2020 GMC Sierra 1500
- 2021 GMC Sierra 1500
- 2018 GMC Sierra 2500
- 2019 GMC Sierra 2500
- 2020 GMC Sierra 2500
- 2021 GMC Sierra 2500
- 2019 GMC Sierra 3500
- 2020 GMC Sierra 3500
- 2021 GMC Sierra 3500
- 2018 GMC Sierra Denali
What a TSB means. Technical service bulletins are repair guidance manufacturers send to dealers — they are not recalls, and repairs are not automatically free (warranty extensions are an exception worth checking). The full document is available via NHTSA’s vehicle lookup.