Chevrolet Express 2016–2020 — technical service bulletin
Bulletin 21NA260 · NHTSA communication 10205580 · issued Nov 29, 2021
Technical service bulletin
communication type
Equipment
component
2016–2020
model years
10
vehicle entries
Official summary
This technical bulletin provides repair information to correct a customer concern of Lack of Power or Poor Performance During High Ambient Temperatures with RPO (C7N) 12,300 LB GVWR or (C4M) 9,900 LB GVWR.
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.