Chevrolet bulletin 23-NA-020
What it saysThis service bulletin provides a procedure to re-seal the front engine cover if found the cause of the customer concern of an engine oil leak. NHTSA’s full summary ↓
Chevrolet filed this with NHTSA as a service bulletin dated Jan 30, 2025, received May 6, 2023, about the engine — 3 documents under this number. It names 1 model year (2023). A service bulletin is not a safety recall: it is the manufacturer telling its dealers how to diagnose or repair a condition, and whether the work is paid for depends on the warranty in force. Quoting the number at a service desk can save a diagnosis.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis service bulletin provides a procedure to re-seal the front engine cover if found the cause of the customer concern of an engine oil leak.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 23-NA-020 | Service bulletin | Jan 30, 2025 | 11014073 | PDF, 362 KB |
| 23-NA-020 | Service bulletin | Mar 26, 2024 | 10252783 | PDF, 89 KB |
| 23-NA-020 | Service bulletin | Apr 27, 2023 | 10235807 | PDF, 114 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 12707585 | X GASKET, ENG FRT CVR | 1 | eBay Motors → |
| 12707584 | X GASKET, ENG FRT CVR | 1 | eBay Motors → |
| 12707583 | X GASKET, ENG FRT CVR | 2 | eBay Motors → |
| 19369831 | — | — | |
| 19369832 | N/A SEALANT (U.S) | — | eBay Motors → |
| 12697070 | N/A SEAL, OIL TRFER TUBE O-RING | 1 | eBay Motors → |
| 12697071 | N/A SEAL, OIL TRFER TUBE O-RING | 1 | eBay Motors → |
| 12670121 | N/A SEAL, O.PMP HSG O-RING | 1 | eBay Motors → |
| 12695546 | N/A GASKET, PCV OIL SEP | 1 | eBay Motors → |
| 12673594 | N/A GASKET, EXH MANIF | 2 | eBay Motors → |
| 12668302 | N/A GASKET, INT MANIF | 8 | eBay Motors → |
| 12730579 | N/A FILTER KIT, OIL | 1 | eBay Motors → |
| 12663298 | N/A PIPE, FUEL FEED INTER RIGHT | 1 | eBay Motors → |
| 12663297 | N/A PIPE, FUEL FEED INTER LEFT | 1 | eBay Motors → |
| 12668422 | N/A SEAL, W/PMP O-RING | 1 | eBay Motors → |
| 11601876 | N/A BOLT, R/AXL SHF | 12 | eBay Motors → |
| 13418808 | N/A SEAL, A/C CMPR HOSE | 1 | eBay Motors → |
| 13418809 | N/A SEAL, A/C CMPR HOSE | 1 | eBay Motors → |
| 11547975 | N/A BOLT, CR/SHF BALR | 1 | eBay Motors → |
| 12672530 | N/A SEAL, CM/SHF HSG CVR (right) | 1 | eBay Motors → |
| 12672531 | N/A SEAL, CM/SHF HSG CVR (left) | 1 | eBay Motors → |
| 12672529 | N/A SEAL. SPLG SHLD | 8 | eBay Motors → |
| 12672379 | N/A GASKET, CTLTC CONV | 2 | eBay Motors → |
| 11548811 | N/A BOLT, W/PMP | — | eBay Motors → |
| 11548166 | N/A BOLT, ENG COOL FLOW CONT VLV | — | eBay Motors → |
| 11548393 | N/A BOLT, THROT BODY | — | eBay Motors → |
| 11604854 | N/A BOLT/SCREW | — | eBay Motors → |
Read by machine from the document NHTSA serves (5 pages), read Sep 30, 2026. A part number is shown only where it matches Chevrolet’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5. One communication is usually filed as several documents — the bulletin, a dealer notice, an owner letter — and the number on any of them finds this page. A PDF link is shown only once NHTSA’s own server has been seen to serve that document; the rest are checked over the following nights. Quote the number at a service desk; it is what the dealer’s system is keyed on.
Doing the repair yourself, or pricing it before the shop does? Search the part by fitment on eBay Motors — the listing and the price are the seller’s.
Find the oil/lubrication for the 2023 Corvette →Affiliate disclosure: some links on this page are affiliate links. If you request a quote or buy through them we may earn a commission at no extra cost to you. Nothing on this page changes because of it.
Model years it names
Source: as the manufacturer filed themA vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
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What owners reported
Source: NHTSA complaint databaseOwners of the 1 model year this bulletin names have filed 27 complaints with NHTSA since 2015.
A complaint is one owner’s account, not a defect finding, and a bulletin is not a recall. Nothing here says this bulletin was issued because of these complaints, or that the repair it describes fixed them. Complaint files on this site begin in 2015.
More bulletins about the engine
Source: same model, same component group53 other manufacturer communications filed against the Chevrolet Corvette under the same component group (engine), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 22-NA-080 | Service bulletin | Sep 6, 2025 | This technical bulletin provides a procedure to replace the camshaft actuator magnet to correct customer concerns of engine related shudder. |
| 00-06-01-026R | Service bulletin | Jun 5, 2025 | This service bulletin provides information on replacing the intake manifold when the engine is replaced after severe internal engine damage. |
| PIE0815A | Service bulletin | Jun 3, 2025 | This engineering information (EI) closure ends the need for gathering further information from technicians/field in regard to the Service En… |
| 23-NA-170 | Service bulletin | May 16, 2025 | This bulletin advises the tech to inspect deeper into what may be the main cause of an engine failure. |
| 23-NA-153 | Service bulletin | May 15, 2025 | The service bulletin advises the tech of a normal transmission shift condition and the delay in throttle response when the throttle plate is… |
| 15-NA-010 | Service bulletin | May 7, 2025 | This service bulletin provides information to dealership personnel for new vehicles with less than 1,000 miles that may not pass California… |
| 25-NA-100 | Service bulletin | Apr 18, 2025 | This warranty administration bulletin provides policy information on vehicles outside of a California Emissions State who move to and regist… |
| 23-NA-115 | Service bulletin | Apr 16, 2025 | This service bulletin provides a procedure to verify the noise and align the camshaft caps to correct customer concerns of a Ticking, Tappin… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Chevrolet, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Chevrolet 23-NA-020 a recall?
No. A service bulletin is a manufacturer communication filed with NHTSA under 49 CFR 579.5; a safety recall carries an NHTSA campaign number (two digits, a letter, six digits) and a federal duty to repair for free. Check the vehicle’s recalls by VIN at nhtsa.gov/recalls, or on its page here.
Is the 23-NA-020 repair free?
Not automatically. A service bulletin describes how to diagnose or repair a condition; who pays depends on the warranty in force, any extension, and the dealer. Quoting the number can save a diagnosis either way. Every GM warranty extension on file lists the ones GM has filed.
Which vehicles does 23-NA-020 cover?
The manufacturer filed it against 1 model year: 2023 Chevrolet Corvette. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.