Chevrolet bulletin N232418320-01
What it saysCertain vehicles, equipped with an 8-speed dual clutch transmission (RPO M1M), may have been serviced with the wrong Main Control Valve Body. NHTSA’s full summary ↓
Chevrolet filed this with NHTSA as a service bulletin dated Mar 7, 2024, about the power train. 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 communicationPicked out of NHTSA’s summary below, word for word. The document itself is the record, and the dealer checks the VIN.
What it applies to, as NHTSA’s summary states it — build dates and equipment as the manufacturer filed them. The dealer checks the VIN and the build date on the door jamb; a vehicle outside the window is not covered by this bulletin.
Customer Satisfaction Program - Certain vehicles, equipped with an 8-speed dual clutch transmission (RPO M1M), may have been serviced with the wrong Main Control Valve Body. Dealers will replace the Main Control Valve Body.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| N232418320-01 | Service bulletin | Mar 7, 2024 | 10251512 | PDF, 142 KB |
What the document itself lists
The manufacturer titles it “REVISION: N232418320 – Customer Satisfaction Program”.
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 24059078 | Main Control Valve Body | — | eBay Motors → |
| 24047742 | Transmission Fluid Filter | — | eBay Motors → |
| 24045737 | Transmission Fluid Pan Bolt | — | eBay Motors → |
| 24048642 | Transmission Pan Gasket | — | eBay Motors → |
| 24299343 | Valve Body Gasket | — | eBay Motors → |
| 24299345 | Valve Body Bolt | — | eBay Motors → |
| 24299346 | Valve Body Bolt | — | eBay Motors → |
| 24299347 | Valve Body Bolt | — | eBay Motors → |
| 19418016 | Automatic Transmission Fluid | — | eBay Motors → |
Read by machine from the document NHTSA serves (4 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 valves/valve body 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. 8 of them name Power Train — the same broad component group this bulletin is filed under. NHTSA groups complaints coarsely, so that means the same area of the vehicle, not necessarily the same fault.
While driving the vehicle in a NYC highway at approximately 45 mph the transmission shifted into neutral causing the vehicle to decelerate gradually resulting in near rear end collision. The vehicle transmission will not engaged into gear while moving nor after stopping
2023 Chevrolet Corvette · Power Train · filed with NHTSA May 18, 2026 · ODI 11738528
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 power train
Source: same model, same component group49 other manufacturer communications filed against the Chevrolet Corvette under the same component group (power train), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| PIE0835 | Service bulletin | May 9, 2025 | This engineering information (EI) is requesting information from technicians to perform the check list provided and contact the engineers li… |
| 23-NA-156 | Service bulletin | Mar 28, 2025 | This service bulletin informs the technician on the running changes to the M1L, M1M and MLH automatic transmission. |
| PIP5966A | Service bulletin | Mar 2, 2025 | This Preliminary information communicates Diagnostic aids for a no start or DTC'S following a transmission replacement |
| 16-NA-019 | Service bulletin | Feb 12, 2025 | This informational buleltin provides information on Transmission Adaptive Functions and Correcting Low Mileage Harsh Shifts, Slips, or Flare… |
| 21-NA-049 | Service bulletin | Jan 14, 2025 | This service bulletin provides a Diagnostic Aid for PicoScope Information and Setup for Transmission Related Concerns. |
| 09-06-04-026Z | Service bulletin | Jan 9, 2025 | This bulletin provides information on identifying Non-GM Engine Calibrations for Gasoline Engines using the Tech 2 or GDS 2. |
| PIP6026 | Service bulletin | Dec 4, 2024 | This Preliminary Information communication advises the technician on the need to provide additional information when creating a TAC case for… |
| 08-07-30-035I | Service bulletin | Nov 27, 2024 | This service bulletin provides information on the harmful effects of ethylene glycol in transmission fluid. |
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 N232418320-01 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 N232418320-01 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 N232418320-01 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.