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Service bulletins for the 2021 Chevrolet Silverado

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.

1747 on file from NHTSA, as of 2026-10-19.

By type

By component

By trouble code

By topic

Only bulletins with component: Engine are shown. Show all

Bulletins, newest first
22-NA-2102025-02-05. Service bulletin. ELECTRICAL SYSTEM; ENGINE. This technical bulletin provides a procedure to locate and repair a broken ground stud at the NOx converter.
24-NA-2392025-01-30. Service bulletin. ELECTRICAL SYSTEM; SEATS; STRUCTURE:BODY; STEERING; ENGINE. This informational bulletin provides a guide on how to diagnose and test for vibrations utilizing the PicoScope.
22-NA-1502025-01-30. Service bulletin. ELECTRICAL SYSTEM; ENGINE. This technical bulletin provides a procedure to program the Reductant Control Module and Setup and Perform the Reductant Fluid Tank Level Reset.
18-NA-0112025-01-30. Service bulletin. ENGINE. Informational bulletin explaining how a plow may cause overheating and engine damage when traveling over 45 mph.
24-NA-1732025-01-24. Service bulletin. ENGINE; ELECTRICAL SYSTEM. This bulletin advises the technician that if the code sets, verify the sensor then inspect the engine oil pump for a sticking valve that may cause the MIL to illuminate.
20-NA-1662025-01-23. Service bulletin. ENGINE. This service bulletin advises the technician of possible coolant entering the areas of the engine, either through failed parts or defects in the castings, that may be the cause of the concerns related to the MIL or the engine running rough.
09-06-04-026Z2025-01-23. Service bulletin. ENGINE; POWER TRAIN; ELECTRICAL SYSTEM. This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2.
22-NA-2182025-01-23. Service bulletin. ENGINE. This informational bulletin advises the technician on normal noises produced by the engine and to explain this to the customer.
03-06-01-023I2025-01-17. Service bulletin. ENGINE. This service bulletin explains how to measure for oil consumption and possible reasons for loss of oil.
16-NA-3762025-01-08. Service bulletin. ENGINE. This informational bulletin provides information on higher than expected oil consumption.
17-NA-3742024-12-19. Service bulletin. ENGINE. This informational bulletin advises the technician of how the Soot information has changed from grams to percentage.
22-NA-1682024-12-18. Service bulletin. ENGINE. This bulletin provides diagnostic information when checking the exhaust system for leaks.
19-NA-2192024-12-17. Service bulletin. ENGINE. This diagnostic tip bulletin provides additional information on how to diagnose a possible valve, lifter or camshaft issue.
24-NA-2412024-12-16. Service bulletin. ENGINE. This informational bulletin advises the technician of a part number change for long block engines used in the trucks noted.
24-NA-2472024-12-16. Service bulletin. ENGINE. This informational bulletin advises the technician of which pan to use if the LCE has been replaced and to install an aluminum pan should be used with a new LCE.
21-NA-0432024-12-10. Service bulletin. STRUCTURE:BODY; WHEELS; ENGINE; SERVICE BRAKES; UNKNOWN OR OTHER. This bulletin advises the dealers to maintain the vehicle stock on hand by doing a full inspection on the vehicles before being sold (prepping) to the customer.
24-NA-2412024-12-05. Service bulletin. ENGINE. This informational bulletin advises the technician of a part number change for long block engines used in the trucks noted.
24-NA-1882024-12-04. Service bulletin. ENGINE. This bulletin advises the tech of a part number change for the engine kit assembly.
04-06-01-029K2024-12-04. Service bulletin. POWER TRAIN; STEERING; ENGINE. This informational bulletin explains Unscheduled Supplemental Services and the importance of GM Simplified Maintenance Schedules.
PIE0804A2024-12-04. Service bulletin. ENGINE. This engineering information (EI) closure ends the need for gathering further information from technicians in regard to a Chirp, Squeal, and/or Whine Type Noise Heard from Front of Vehicle During a Cold Start and/or While in Operation.
24-NA-1882024-11-27. Service bulletin. ENGINE. This bulletin advises the tech of a part number change for the engine kit assembly.
24-NA-1962024-11-19. Service bulletin. ENGINE. This informational bulletin advises the tech and the customer of a normal DEF operation while under high load conditions and when the time is right to fill the DEF at that time frame.
23-NA-0732024-11-16. Service bulletin. ENGINE. This technical bulletin provides repair information to correct a customer concern of Evaporative DTCs P0442, P0446, P0455 or P0449, Caused by Dust Intrusion into the Evaporative Canister.
03-06-01-023H2024-11-14. Service bulletin. ENGINE. This service bulletin explains how to measure for oil consumption and possible reasons for loss of oil.
01-06-01-011Q2024-11-13. Service bulletin. ENGINE. This service bulletin provides guidelines and diagnostic/repair information to technicians regarding vehicle engine oil consumption.

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