Chevrolet Silverado 2017–2018 — technical service bulletin
Bulletin 17NA393 · NHTSA communication 10139232 · issued Dec 8, 2017
Technical service bulletin
communication type
Engine and Engine Cooling
component
2017–2018
model years
5
vehicle entries
Official summary
This informational bulletin explains how to check the NOx Catalyst Reductant-Load Adaptive Values using GSD2.
Vehicles covered
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.