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Service bulletins for the 2021 Chevrolet Corvette

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.

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

By type

By component

By trouble code

By topic

Only bulletins with component: Transmission and driveline are shown. Show all

Bulletins, newest first
PI0281L2025-06-12. Service bulletin. STEERING; POWER TRAIN; SUSPENSION. This preliminary informational (PI) bulletin provides information to dealership personnel that may be helpful when addressing underbody component corrosion with customers.
23-NA-1562025-04-28. Service bulletin. POWER TRAIN. This service bulletin informs the technician on the running changes to the M1L, M1M and MLH automatic transmission.
21-NA-0492025-01-30. Service bulletin. POWER TRAIN. This service bulletin provides a Diagnostic Aid for PicoScope Information and Setup for Transmission Related Concerns.
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.
23-NA-1562025-01-16. Service bulletin. POWER TRAIN. This service bulletin informs the technician on the running changes to the M1L, M1M, MLH automatic transmissions.
08-07-30-035I2024-12-19. Service bulletin. POWER TRAIN. This service bulletin provides information on the harmful effects of ethylene glycol in transmission fluid.
PIP60262024-12-09. Service bulletin. POWER TRAIN; UNKNOWN OR OTHER. This Preliminary Information communication advises the technician on the need to provide additional information when creating a TAC case for a DCT transmission
PIP60242024-12-05. Service bulletin. POWER TRAIN. This Preliminary Information communication advises the dealer the correct time, mileage and Labor operation used for the first covered Maintenace.
PIP6016A2024-12-04. Service bulletin. POWER TRAIN. This Preliminary information communicates that due to parts shortages caused by the devastation of hurricane Helene we are restricting transmission assemblies in service.
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.
20-NA-1382024-11-05. Service bulletin. POWER TRAIN; ENGINE. This bulletin provides information on Policies Applicable to All U.S. Dealers for Engine and Transmission Assembly Replacement Under Warranty, Policy or Customer Enthusiasm and information on Submission of Warranty Transaction in Global Warranty Management.
08-07-30-026I2024-10-24. Service bulletin. POWER TRAIN. This service bulletin provides information on some vehicles that may rock or move slightly forward or rearward while in Park at start up after cold soak. This condition may be accompanied by a clunk noise. This is a slight movement that is more often seen visually, rather than felt, when viewed from the outside and using the auto-start feature, if equipped.
22-NA-1732024-08-30. Service bulletin. POWER TRAIN. This service bulletin provides information help guide technicians to known areas of possible transmission fluid leaks.
23-NA-1762024-08-28. Service bulletin. ELECTRICAL SYSTEM; POWER TRAIN. This service bulletin advises the technician to take a screen shot of the park position sensor and send it to TAC, where they will determine trans replacement or vehicle repair to correct customer concerns of a Dead Battery, No Start, and/or Vehicle Will Not Shut Down.
23-NA-1562024-08-16. Service bulletin. POWER TRAIN. This service bulletin informs the technician on the running changes to the M1L automatic transmission.
24-NA-1412024-08-15. Service bulletin. POWER TRAIN. GM is receiving damaged (cracked or broken) transmission cores returned to the reman facilities. The damage is being caused either in the removal process by the technician, or inadequate packaging or shipping. This bulletin advises the dealers to be more careful not to damage the transmissions during removal and to package the core properly for return.
23-NA-1422024-07-31. Service bulletin. POWER TRAIN. This technical bulletin provides a procedure for the techs to replace the forward check ball and separator plate if found the cause of the customers concern of No Forward Gear When Shifting from Park to Drive and/or Reverse to Drive.
99-04-20-002O2024-07-30. Service bulletin. POWER TRAIN. This service bulletin provides information on Driveline Clunk Noise and what is acceptable and what is considered normal operation.
23-NA-1972024-07-09. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM. This service bulletin provides a service procedure to correct a customer concern of a noise from transmission area and an MIL illuminated with Multiple DTCs Set.
23-NA-1422024-06-18. Service bulletin. POWER TRAIN. This technical bulletin provides a procedure for the techs to replace the forward check ball and separator plate if found the cause of the customers concern of No Forward Gear When Shifting from Park to Drive and/or Reverse to Drive.
08-07-30-035H2024-06-07. Service bulletin. POWER TRAIN. This bulletin provides information on the harmful effects of water or ethylene glycol in transmission fluid.
22-NA-1732024-05-31. Service bulletin. POWER TRAIN. This service bulletin provides information help guide technicians to known areas of possible transmission fluid leaks.
15-00-89-004G2024-05-15. Service bulletin. ENGINE; SUSPENSION; POWER TRAIN. This service bulletin provides technicians with information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
23-NA-1972024-05-02. Service bulletin. POWER TRAIN. This service bulletin provides a service procedure to correct a customer concern of a noise from transmission area and an MIL illuminated.
23-NA-1702024-03-19. Service bulletin. POWER TRAIN; ELECTRICAL SYSTEM; ENGINE AND ENGINE COOLING. This bulletin advises the tech to inspect deeper into what may be the main cause of an engine failure.

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