Cadillac bulletin N23-240852
What it says(There may be future updates under this same release number.) Your Cadillac keeps getting better. NHTSA’s full summary ↓
Cadillac filed this with NHTSA as a service bulletin dated Jun 16, 2023, received Jun 28, 2023, about the electrical system. It names 2 model years (2021). 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 communication(There may be future updates under this same release number.) Your Cadillac keeps getting better. This software update includes the following if your vehicle is equipped: Refinements: Updates made to the network connectivity to prevent unwanted interruption of emergency calls. Updates made to the Adaptive Cruise Control functionality for improved performance and smoother driving experience. Updates made to the overall vehicle software update process. Updates made to the Super Cruise driver assistance technology for enhanced lane changes, improved tunnel performance, and an overall upgraded driving experience. A variety of other minor software updates to make your driving and in-vehicle experience better. Better Never Stopsâ¢â
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| N23-240852 | Service bulletin | Jun 16, 2023 | 10238239 | PDF, 95 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.
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 2 model years this bulletin names have filed 37 complaints with NHTSA since 2015. 14 of them name Electrical System — 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.
Both front doors will no longer open from the outside. The button on the inside of the door handle doesn't respond when pushed and that is the only way to get in the car without rolling the windows down or using the emergency key.
2021 Cadillac CT5 · Electrical System · filed with NHTSA Sep 17, 2026 · ODI 11764894
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 electrical system
Source: same model, same component group75 other manufacturer communications filed against these Cadillac models under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Cadillac list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 22-NA-242 | Service bulletin | Apr 24, 2025 | This warranty administration bulletin provides information for dealers/technicians on System Reset and Connector Reconnect Labor Code Number… |
| 24-NA-229 | Service bulletin | Apr 10, 2025 | This bulletin provides a procedure on how to check for a battery drain utilizing the Picoscope and how to measure the load on the system tha… |
| 24-NA-193 | Service bulletin | Apr 7, 2025 | This service bulletin provides repair information on software release Update W52E-176.1.2-M170-SQBR5-250.2 to correct customer concern of ra… |
| 25-NA-087 | Service bulletin | Apr 3, 2025 | This service bulletin provides information on the proper Reflective High Temperature Heat and/or Insulating Tape to use for certain repairs… |
| 13-08-116-001K | Service bulletin | Mar 31, 2025 | The intent of this service bulletin is to identify aftermarket ALDL or DLC interface devices as potential sources for causing multiple custo… |
| 24-NA-098 | Service bulletin | Mar 21, 2025 | This service bulletin provides information for dealers/technicians on Service Programming System (SPS) Error Codes E4398, E4399, E4401, E440… |
| 15-06-03-001F | Service bulletin | Mar 12, 2025 | This service bulletin provides information to diagnose batteries that have set for a long period of time and/or cold weather climates and te… |
| 25-NA-026 | Service bulletin | Feb 11, 2025 | This service bulletin provides repair information to correct a customer concern of Service Drivers Assist Message Illuminated, Super Cruise… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Cadillac, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Cadillac N23-240852 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 N23-240852 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 N23-240852 cover?
The manufacturer filed it against 2 model years: 2021 Cadillac CT4, 2021 Cadillac CT5. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.