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Service bulletins for the 2020 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.

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

By type

By component

By trouble code

By topic

Bulletins, newest first
PIE06252021-05-03. Service bulletin. EXTERIOR LIGHTING:TURN SIGNAL:SWITCH. This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineer listed in regards on a turn signal not canceling and/or mis-canceling.
110089005Q2021-05-03. Service bulletin. EQUIPMENT. This Warranty Administration bulletin provides information on Dealer Empowerment for Goodwill, Customer Enthusiasm and Policy (U.S. Only).
1008110001I2021-05-03. Service bulletin. EQUIPMENT ADAPTIVE/MOBILITY. This informational bulletin provides information on proper use of floor mats.
21NA0492021-05-03. Service bulletin. POWER TRAIN. This service bulletin provides a Diagnostic Aid for PicoScope Information and Setup for Transmission Related Concerns.
20NA1382021-05-03. Service bulletin. ENGINE AND ENGINE COOLING; POWER TRAIN. 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.
20NA1322021-05-03. Service bulletin. ELECTRICAL SYSTEM. This warranty administration bulletin provides policy information on the requirements for battery testing and warranty replacements.
20NA1232021-05-03. Service bulletin. ELECTRICAL SYSTEM. This service bulletin provides repair information to correct a customer concern of a Malfunction Indicator Lamp (MIL) Illuminated with DTCs U1961, U1983 setting.
18NA3062021-05-03. Service bulletin. EQUIPMENT. This Warranty Administration bulletin provides information for dealers/Service advisors on when and how to submit a Pre-Repair Authorization (PRA).
18NA0992021-05-03. Service bulletin. EQUIPMENT. This bulletin provides information for use on a Product Assistance Claim (PAC), which is formerly known as a Product Allegation Resolution (PAR) claim.
16NA1092021-05-03. Service bulletin. STEERING. This service bulletin provides a procedure inspecting for excess grease or Sealant on the Exterior of the steering gear due to seeing grease or sealant on certain locations on the gear.
N2023157312021-04-26. Service bulletin. WHEELS. Service Update - certain vehicles may have a condition where exposed porosity in wheel castings are larger than allowed and do not meet internal GM requirements. Vehicles in this field action are to have two sets of wheels inspected. The wheels on the vehicle are inspected under N202315730 and the extra wheels are inspected under this field action. Dealers are to inspect the wheels and replace if necessary.
N2023157302021-04-26. Service bulletin. WHEELS. Service update - certain vehicles may have a condition where exposed porosity in wheel castings are larger than allowed and do not meet internal GM requirements. Dealers are to inspect the wheels and replace if necessary.
N2123277402021-04-26. Service bulletin. FUEL SYSTEM, GASOLINE. Service Update. On certain vehicles, the HVAC condensate drain hose may not be fully installed and may result in a water leak. Dealers are to fully install the HVAC condensate drain hose.
PIP57972021-04-19. Service bulletin. POWER TRAIN. This Preliminary information communicates the need to replace the transmission assembly for faults related to non-serviceable internal parts..
PIP5709N2021-04-19. Service bulletin. POWER TRAIN. This Preliminary information communicates the transmission used in the 2020 and 2021 Corvette is on exchange with the supplier for early root cause analysis.
PIP5212C2021-04-19. Service bulletin. ENGINE AND ENGINE COOLING. This Preliminary Information communication provides information to the technician about vehicles that have run hot and or has a tick noise. Technician should inspect the head gaskets to ensure are not installed backwards. Technician should replace the head gasket if they are found installed backwards.
PIC64342021-04-19. Service bulletin. ELECTRONIC STABILITY CONTROL:AUTOMATIC (ASC); SUSPENSION. This Preliminary Information communicates diagnostic tips for a technician to diagnose a C103C / C103E set in the K218 Front Suspension Lift System.
PIP5786A2021-04-19. Service bulletin. VISIBILITY:DEFROSTER/DEFOGGER/HVAC SYSTEM:CONDENSOR/EVAPORATOR. This Preliminary information communicates I vehicle may come in with a need to test the EVAP system for a leaks. CH-52519 modification
PIP5709M2021-04-19. Service bulletin. POWER TRAIN. This Preliminary information communicates the transmission used in the 2020 and 2021 Corvette is on exchange with the supplier for early root cause analysis.
PIP57862021-04-19. Service bulletin. FUEL SYSTEM, GASOLINE:STORAGE:EVAPORATIVE EMISSIONS:CANISTER. This Preliminary information communicates I vehicle may come in with a need to test the EVAP system for a leaks. CH-52519 modification
PIT5817A2021-04-19. Service bulletin. ELECTRICAL SYSTEM. This Preliminary information communicates and issue with a SES MIL and the BCM keeping the ignition main relay on after the vehicle is turned off. Dealers are to replace the BCM.
PIP5709L2021-04-19. Service bulletin. POWER TRAIN. This Preliminary information communicates the transmission used in the 2020 and 2021 Corvette is on exchange with the supplier for early root cause analysis.
PIC6384D2021-04-19. Service bulletin. ELECTRICAL SYSTEM; STRUCTURE. This Preliminary information communicates a parts restriction is in place for the Body Control Module on 2020 Cadillac CT4, CT5, Chevrolet Corvette, Suburban, Tahoe and GMC Yukon.
150089004C2021-03-08. Service bulletin. SUSPENSION:FRONT:MACPHERSON STRUT; SUSPENSION:FRONT:SHOCK ABSORBER; POWER TRAIN:AUTOMATIC TRANSMISSION:FLUID/LUBRICANT. This service bulletin provides technicians with updated information to help identify the differences between what is considered a fluid leak, and what is considered fluid seepage.
030846004X2021-03-08. Service bulletin. ELECTRICAL SYSTEM; EQUIPMENT:OTHER:OWNERS/SERVICE/OTHER MANUAL. This service bulletin announces that the Part Restriction and Ordering Process Information for OnStar® Vehicle Communication Interface Modules (VCIM) (GMNA Only) has ended.

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