Chevrolet Silverado 2500 2017–2019 — technical service bulletin
Bulletin N212346580 · NHTSA communication 10214721 · issued Dec 17, 2021
Technical service bulletin
communication type
Engine and Engine Cooling
component
2017–2019
model years
8
vehicle entries
Official summary
Block Heater Restore
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.