Cadillac bulletin N232412712
What it saysService Update - Certain vehicles with a 2.0L engine have an Engine Control Module (ECM) that may not properly diagnose, may not set Diagnostic Trouble Codes (DTCs), or may not illuminate the Malfunction Indicator Light… NHTSA’s full summary ↓
Cadillac filed this with NHTSA as a service bulletin dated Dec 5, 2023, received Dec 6, 2023, about the engine. 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 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.
Service Update - Certain vehicles with a 2.0L engine have an Engine Control Module (ECM) that may not properly diagnose, may not set Diagnostic Trouble Codes (DTCs), or may not illuminate the Malfunction Indicator Light (Check Engine Light) if certain fault conditions of the catalytic converter were to occur. Owners who have accepted applicable terms and conditions will have the opportunity to accept these software changes using wireless over-the-air (OTA) technology without having to bring their vehicle to a dealership. Alternatively, owners may have their vehicle serviced at a GM dealer to receive these software updates. Dealers are to reprogram the ECM.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| N232412712 | Service bulletin | Dec 5, 2023 | 10246277 | PDF, 460 KB |
What the document itself lists
The manufacturer titles it “N232412712 - Service Update”.
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 9106862 | Engine Control Module Reprogramming with SPS | 0.3 hrs |
Read by machine from the document NHTSA serves (5 pages), read Sep 30, 2026. A part number is shown only where it matches Cadillac’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 engine control module (ecu/ecm) for the 2021 CT4 →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 2 model years this bulletin names have filed 37 complaints with NHTSA since 2015. 17 of them name Electrical System, Engine — 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 on a very busy highway going downhill when suddenly the vehicle started feeling abnormal like it was going to turn off automatically, heard an abnormal grinding noise coming from the engine the vehicle dropped speed drastically and the check engine light turned on , luckily we were on a part of the road where I merged…
2021 Cadillac CT5 · Engine · filed with NHTSA Feb 12, 2026 · ODI 11717706
valve body failed and was supposedly repaired. I had the car 1 day and valve body failed again. My car has been in the shop since November 4, 2024 with no estimated time of repair because no parts are available. I was told they would replace the transmission. That has not happened yet. No parts available.
2021 Cadillac CT4 · Engine · filed with NHTSA Apr 16, 2025 · ODI 11655109
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 engine
Source: same model, same component group78 other manufacturer communications filed against these Cadillac models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Cadillac list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| N262568830 | Service campaign | Aug 4, 2026 | Certain vehicles listed above may have a condition in which the oil filter was not adequately tightened. Dealers are to check and tighten th… |
| N262552610 | Service campaign | May 7, 2026 | Certain vehicles may have a condition that could cause the crankcase pressure sensor to fail. If this failure occurs, the Malfunction Indic… |
| 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. |
| N252519310 | Service campaign | Aug 26, 2025 | Certain vehicles listed above, may have a condition in which the torque on the engine thermostat housing fasteners is low. Dealers will insp… |
| 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. |
| N252503990 | Service campaign | May 20, 2025 | Customer Satisfaction Program - Certain vehicles listed above may have a condition in which the oil plug in the oil pan may not be seated pr… |
| 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… |
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 N232412712 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 N232412712 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 N232412712 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.