GM bulletin 23-NA-187
What it saysThis bulletin provides a service procedure to correct a customer concern of a Shake and/or Shudder During Steady Speed and/or Light Throttle Acceleration Between 25 and 50 MPH (40 and 80 KM/H). NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Oct 24, 2023, received Nov 15, 2023, about the equipment. It names 4 model years across Chevrolet, GMC 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 · GMC · Cadillac.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationThis bulletin provides a service procedure to correct a customer concern of a Shake and/or Shudder During Steady Speed and/or Light Throttle Acceleration Between 25 and 50 MPH (40 and 80 KM/H).
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 23-NA-187 | Service bulletin | Oct 24, 2023 | 10245245 | PDF, 131 KB |
What the document itself lists
The manufacturer titles it “Shake and/or Shudder During Steady Speed and/or Light Throttle Acceleration”.
Labour operation and the time the manufacturer allows
| Operation | Description | Time |
|---|---|---|
| 8486358 | Transmission Control Module (TCM) Reprogram | 0.3 hrs |
Read by machine from the document NHTSA serves (6 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 2 model years
GMC 1 model year
Cadillac 1 model year
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 4 model years this bulletin names have filed 1,090 complaints with NHTSA since 2015. 347 of them name Power Train, 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.
While driving our 2023 Chevrolet Duramax diesel suburban, I was waiting, at a complete stop, against the median to make a U turn. When the traffic cleared, I began the turn when I suddenly noticed a nearly complete loss of power, hesitancy of engine engagement, and little response to the gas pedal being depressed.
2023 Chevrolet Suburban · Power Train · filed with NHTSA Jan 3, 2025 · ODI 11633963
I've had my 2023 Tahoe for 15 months, purchased Dec. 2023 Issue #1. Dash message on start up " Restraint System Needs Service". I noticed small lights overhead (buttons for tail gate, sun roof, reading lamps) were off. I pressed some of them, and dash message went away, and lights came on. Everything worked fine.
2023 Chevrolet Tahoe · Electrical System · filed with NHTSA Mar 2, 2024 · ODI 11575077
At 5000 miles after the last oil change, my low oil light came on, took it to my local mechanic and he said it was 3 quarts low. took it to the dealership and they say this is normal but have me to a check every time i put gas up to 2000 miles. bring it back and they say its one quart low and this is normal.
2023 Chevrolet Tahoe · Power Train · filed with NHTSA Jun 26, 2024 · ODI 11596823
In depth: 2023 GMC Yukon transmission and drivetrain problems → · 2023 GMC Yukon electrical problems →
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 group85 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-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… |
| 22-NA-038 | Service bulletin | Dec 14, 2024 | This warranty bulletin provides information on Customer Concern Not Duplicated (CCND) Labor Operation Numbers. |
| 18-NA-263 | Service bulletin | Dec 14, 2024 | This warranty administration bulletin provides policy information for variable diagnostic time allowances on select labor operations… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Chevrolet, GMC and Cadillac, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM 23-NA-187 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-187 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-187 cover?
The manufacturer filed it against 4 model years across 3 brands (Chevrolet, GMC and Cadillac): 2023 Cadillac Escalade, 2023 Chevrolet Suburban, 2023 Chevrolet Tahoe, 2023 GMC Yukon. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.