GM bulletin N232421270
What it saysStop Delivery Order Await Communication: Reference Number N232421270. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Nov 20, 2023, received Oct 20, 2023, about the equipment — 2 documents under this number. It names 6 model years across Chevrolet and GMC (2024). 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.
One page for every brand it was filed under. Each brand’s bulletins: Chevrolet · GMC.
Get the next GM bulletin for your model by email Weekly, only when something new is filed. Nothing else; one-click unsubscribe.
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.
Stop Delivery Order Await Communication: Reference Number N232421270. Effective immediately, stop the delivery of those certain 2024 Chevrolet Silverado and GMC Sierra vehicles which are in the attached VIN file and in new vehicle inventory or in transit. Dealers are to wait for further communication. The GM reference number is N232421270.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| N232421270 | Service bulletin | Nov 20, 2023 | 10245350 | PDF, 525 KB |
| N232421270 | Service bulletin | Oct 19, 2023 | 10244247 | PDF, 58 KB |
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 owners/service/other manual for the 2024 Silverado →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 themChevrolet 3 model years
GMC 3 model years
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
Email me new GM bulletins for one of these models
A weekly email, sent only in a week when GM files something new with NHTSA for the model you pick — service bulletins, campaigns, warranty extensions, over-the-air notices, every model year. Nothing else is sent; one-click unsubscribe in every message. Separate from recall alerts.
What owners reported
Source: NHTSA complaint databaseOwners of the 6 model years this bulletin names have filed 1,091 complaints with NHTSA since 2015. 36 of them name Structure — 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.
The contact owns a 2024 Chevrolet Silverado 3500. The contact stated while driving at approximately 60 MPH, the front driver's side and passenger's side wheels shuddered when the vehicle drove over a pothole or an object in the roadway. No warning light was illuminated.
2024 Chevrolet Silverado 3500HD · Structure · filed with NHTSA Dec 19, 2024 · ODI 11631639
On 1/20/26, we purchased a ‘24 Chevy Silverado EV from a Chevrolet dealership. 2 days later, on 1/22/26, while my husband was driving on the interstate, the tonneau cover partially detached and flew backwards lifting upwards and flapping violently.
2024 Chevrolet Silverado · Structure · filed with NHTSA Jan 26, 2026 · ODI 11713445
While on freeway going 75 mph, GMC installed soft tonneau cover came loose from forward anchor points and starting flapping loudly in wind and without quickly stopping would have flown off truck and hit surrounding vehicles
2024 GMC Sierra · Structure · filed with NHTSA May 1, 2025 · ODI 11658330
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 equipment
Source: same model, same component group120 other manufacturer communications filed against these GM models under the same component group (equipment), newest first. The eight newest are listed; the rest are on the Chevrolet list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| PIT6504 | Service bulletin | Apr 1, 2026 | This preliminary information communicates a normal characteristic where Some customers may comment that they have a " Forward Collision Unav… |
| PIP5601B | Service bulletin | Jul 18, 2025 | This Preliminary Information communication provides information to the technician about vibration complaints that are one of the most challe… |
| 22-NA-161 | Service bulletin | May 17, 2025 | This informational bulletin provides information for dealers/technicians on power folding mirrors do not fold at the same speed. |
| 20-NA-051 | Service bulletin | Apr 30, 2025 | This informational bulletin provides information on the Low Cab Forward trucks and the Alpine Radio Exchange Program. |
| 22-NA-096 | Service bulletin | Mar 29, 2025 | This informational bulletin provides information for dealers/technicians on Customer Education Bulletin for Google Built In Radio. |
| 17-NA-073 | Service bulletin | Mar 5, 2025 | This warranty administration bulletin provides policy information with the field action courtesy transportation policy. |
| 17-NA-331 | Service bulletin | Jan 17, 2025 | Rear View Camera Guidelines Not Present at Times Condition Some customers may report that the Rear View Camera (RVC) guidelines are temp… |
| 21-NA-091 | Service bulletin | Dec 21, 2024 | This service bulletin provides information for customers/dealers/technicians on Normal Camera Display Operation - Flashing Diamond - Spot… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Chevrolet and GMC, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM N232421270 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 N232421270 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 N232421270 cover?
The manufacturer filed it against 6 model years across 2 brands (Chevrolet and GMC): 2024 Chevrolet Silverado, 2024 Chevrolet Silverado 2500HD, 2024 Chevrolet Silverado 3500HD, 2024 GMC Sierra, 2024 GMC Sierra 2500HD, 2024 GMC Sierra 3500HD. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.