GM bulletin 23-NA-089
What it saysThis service bulletin provides service procedure information to correct a customer concern of a Knocking Noise Heard from Engine and/or Transmission Area. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Jun 9, 2023, received Jun 21, 2023, about the engine. It names 3 model years across Chevrolet and Cadillac (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.
One page for every brand it was filed under. Each brand’s bulletins: Chevrolet · Cadillac.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis service bulletin provides service procedure information to correct a customer concern of a Knocking Noise Heard from Engine and/or Transmission Area.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 23-NA-089 | Service bulletin | Jun 9, 2023 | 10237943 | PDF, 515 KB |
What the document itself lists
The manufacturer titles it “Knocking Noise Heard from Engine and/or Transmission Area”.
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 24292796 | X CONVERTER ASM-TORQ | 1 | eBay Motors → |
| 12698623 | N/A SEAL-ENG OIL CLR | 1 | eBay Motors → |
| 12698624 | N/A SEAL-ENG OIL CLR | 1 | eBay Motors → |
| 12687885 | N/A GASKET-CTLTC CONV | 1 | eBay Motors → |
| 23355685 | N/A GASKET-CTLTC CONV | 1 | eBay Motors → |
| 11604056 | N/A CLAMP-PROP SHF HUB | 1 | eBay Motors → |
| 23135703 | N/A SEAL-TRANS FLUID CLR PIPE FTG | 1 | eBay Motors → |
| 84517849 | SHF BOOT | 2 | eBay Motors → |
| 25874797 | N/A SEAL-TRANS FLUID CLR PIPE FTG | 2 | eBay Motors → |
| 23278166 | N/A SEAL-TRANS FLUID CLR PIPE | 4 | eBay Motors → |
| 19352619 | N/A FLUID-A/TRANS (ULV USA) | — | eBay Motors → |
| 19352620 | N/A FLUID-A/TRANS (ULV Canada) | — | eBay Motors → |
| 24298546 | N/A CONVERTER ASM-TORQ | 1 | eBay Motors → |
| 11603519 | N/A CLAMP ASM-EXH PIPE | 1 | eBay Motors → |
| 11588468 | N/A BOLT/SCREW-TRANSAXLE T/CV | 6 | eBay Motors → |
| 22860193 | N/A CLAMP ASM-EXH MANIF RR PIPE | 1 | eBay Motors → |
| 24298545 | N/A CONVERTER ASM-TORQ | 1 | eBay Motors → |
| 22997477 | N/A GASKET-EXH SYS FRT | 1 | eBay Motors → |
| 12685956 | N/A SEAL-VAC PUMP OIL OTLT PIPE | 1 | eBay Motors → |
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 8486288 | Diagnose Knocking Noise Concern | 0.3 hrs |
Read by machine from the document NHTSA serves (3 pages), read Sep 30, 2026. A part number is shown only where it matches GM’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.
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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 themChevrolet 1 model year
Cadillac 2 model years
A 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 3 model years this bulletin names have filed 32 complaints with NHTSA since 2015. 15 of them name Power Train, 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.
Early morning starts, backing out of my garages which has a slight angle to is and then putting the car in drive and accelerating at a low speed when car reaches 10 miles per hour the engine races and the transmission hesitates. This only happens on the at the start of the day. Doesn't happen again until the next day.
2023 Cadillac CT4 · Power Train · filed with NHTSA Nov 8, 2023 · ODI 11554188
The valve body in the ten speed transmission failed while driving. The transmission did a rough shift and a message popped up on the display saying that power has been reduced along with the check engine light illuminating. The transmission reduced usable gears to prevent damage.
2023 Cadillac CT5 · Power Train · filed with NHTSA Sep 3, 2025 · ODI 11684787
Engine failure which required a full engine replacement. The vehicle is unmodified and the engine was replaced under warranty. The certified Chevrolet dealer that replaced the engine confirmed that the issue was the same bearing failure that is impacting the 6.2L L87 V8 engines.
2023 Chevrolet Camaro · Engine · filed with NHTSA Dec 13, 2025 · ODI 11704912
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 group92 other manufacturer communications filed against these GM models 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 |
|---|---|---|---|
| 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 Chevrolet and Cadillac, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM 23-NA-089 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-089 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-089 cover?
The manufacturer filed it against 3 model years across 2 brands (Chevrolet and Cadillac): 2023 Cadillac CT4, 2023 Cadillac CT5, 2023 Chevrolet Camaro. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.