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Service bulletins for the 2021 Chevrolet Express

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

643 on file from NHTSA, as of 2026-10-19.

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By component

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Only bulletins with component: Exhaust and emissions are shown. Show all

Bulletins, newest first
19-NA-0442024-02-21. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL; FUEL SYSTEM, GASOLINE. This service bulletin provides information on the cold start control system in DI engines to reduce cold start emissions and improve fuel economy.
10-06-05-002M2023-08-28. Service bulletin. FUEL SYSTEM, DIESEL; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. This informational bulletin provides information on Clean Exhaust Filter See Owner Manual Now or Cleaning Exhaust Filter Keep Driving Until Message is Cleared messages Displayed on DIC, DTC P2463 May Be Set.
N2323987612023-05-04. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL. Emission Recall - General Motors has decided to conduct a voluntary emissions recall involving certain vehicles. The Vehicle Emissions Control Information (VECI) label may not contain the correct maximum completed vehicle frontal area value. Dealers will remove the existing label, clean and replace.
16-NA-3802023-04-06. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM; ENGINE AND ENGINE COOLING. This service bulletin provides a diagnostic aid procedure on how to perform a quick test to check if the DPF is the cause of excessive soot from the tailpipe.
16-NA-2442023-04-06. Service bulletin. FUEL SYSTEM, DIESEL; ENGINE AND ENGINE COOLING; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. This informational bulletin provides information on Diesel Exhaust Fluid (DEF) and the proper use of the DEF system.
20-NA-0822022-10-11. Service bulletin. FUEL SYSTEM, DIESEL; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:EMISSION CONTROL; ENGINE AND ENGINE COOLING. This informational bulletin explains why more DEF is being used in diesel engines due to new emission standards.
19NA2372022-05-31. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. This informational bulletin explains how to identify possible DEF contamination.
100605002I2020-12-21. Service bulletin. EQUIPMENT; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. This informational bulletin provides information on Clean Exhaust Filter See Owners Manual Now or Cleaning Exhaust Filter Keep Driving Until Message is Cleared messages Displayed on DIC, DTC P2463 May Be Set.
17NA3522020-11-30. Service bulletin. EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY; ENGINE AND ENGINE COOLING:EXHAUST SYSTEM. This informational bulletin explains how the SOOT readings went from grams to percentage. 2-1-18 Change Subject to reflect the test procedure. 5-1-18 Updated the Information section.
16NA3802020-11-30. Service bulletin. ENGINE AND ENGINE COOLING:EXHAUST SYSTEM:MANIFOLD/HEADER/MUFFLER/TAIL PIPE; EQUIPMENT; EQUIPMENT ADAPTIVE/MOBILITY. This informational bulletin provides a procedure on how to perform a quick test to check if the DPF is the cause of excessive soot from the tailpipe.

The summaries are NHTSA's. Each bulletin's page links NHTSA's copy of the manufacturer's document.