GM bulletin 19-NA-101
What it saysThis service bulletin provides a procedure to replace the intake manifold if diagnostics has found the Non Return Valve missing to correct customer concerns of possible oil consumption and//or leaks. NHTSA’s full summary ↓
GM filed this with NHTSA as a service bulletin dated Jul 25, 2024, received Aug 14, 2024, about the engine. It names 15 model years across Chevrolet and Buick (2016–2021). 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.
One page for every brand it was filed under. Each brand’s bulletins: Chevrolet · Buick.
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 communicationThis service bulletin provides a procedure to replace the intake manifold if diagnostics has found the Non Return Valve missing to correct customer concerns of possible oil consumption and//or leaks.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 19-NA-101 | Service bulletin | Jul 25, 2024 | 11006376 | PDF, 198 KB |
What the document itself lists
Part the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 28289977 | X MANIFOLD, INT | 1 | eBay Motors → |
Read by machine from the document NHTSA serves (2 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.
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.
Model years it names
Source: as the manufacturer filed themChevrolet 11 model years
Buick 4 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 15 model years this bulletin names have filed 1,285 complaints with NHTSA since 2015. 510 of them name 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.
On the 2016 Chevrolet Cruze, the 61 owners who gave an odometer reading for Engine reported it at a median of 66,445 miles. That figure is one model year’s, not the whole range this bulletin covers — medians from different model years are not averaged.
Dear GM Executive Office, I am writing in frustration and disappointment after being told today by Chevrolet Customer Assistance that the case I opened (Case # ) was simply a "dealer complaint" and that no further help would be offered - despite my vehicle exhibiting a recurring, safety-related malfunction covered under Special Coverage…
2018 Chevrolet Sonic · Engine · filed with NHTSA Jul 22, 2025 · ODI 11675305
The contact owns a 2016 Buick Encore. While driving 65 MPH, the vehicle decelerated to 44 MPH and the vehicle stalled. The vehicle coasted until it came to a complete stop. The vehicle was restarted, but hesitated to drive. The vehicle was taken to bob ruth ford (700 n u.s. The vehicle was currently being repaired under warranty.
2016 Buick Encore · Engine · filed with NHTSA Oct 24, 2019 · ODI 11270668
The contact owns a 2016 Chevrolet Cruze. While driving the vehicle, the "start, stop" feature was activated when the contact approached a red light. When the accelerator pedal was applied while making a right turn, the vehicle lost power and was almost struck by another vehicle from the rear. The failure recurred multiple times.
2016 Chevrolet Cruze · Engine · filed with NHTSA Dec 2, 2016 · ODI 10929617
In depth: 2016 Chevrolet Cruze engine 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 engine
Source: same model, same component group72 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 |
|---|---|---|---|
| N242484750-02 | Warranty extension | Sep 1, 2026 | Special Coverage. Certain 2022 model year Buick Encore GX and Chevrolet Trailblazer vehicles, equipped with a 1.2L engine, may have a condi… |
| N242450640-02 | Warranty extension | Sep 1, 2026 | Special Coverage. Certain 2021 model year Buick Encore GX and Chevrolet Trailblazer vehicles, equipped with a 1.2L engine, may have a condi… |
| N232407740-03 | Warranty extension | Sep 1, 2026 | Special Coverage. Certain 2020 model year Buick Encore GX vehicles, equipped with a 1.2L engine, may have a condition that could cause the… |
| N252499670 | Service campaign | Oct 23, 2025 | Certain vehicles, equipped with a 1.4L engine, may have a condition that could cause the turbocharger to fail. If this condition occurs, th… |
| N242484750-01 | Warranty extension | Oct 20, 2025 | Special Coverage. Certain 2022 model year Buick Encore GX and Chevrolet Trailblazer vehicles, equipped with a 1.2L engine, may have a condi… |
| N242450640-01 | Warranty extension | Oct 20, 2025 | Special Coverage. Certain 2021 model year Buick Encore GX and Chevrolet Trailblazer vehicles, equipped with a 1.2L engine, may have a condi… |
| N232407740-02 | Warranty extension | Oct 20, 2025 | Special Coverage. Certain 2020 model year Buick Encore GX vehicles, equipped with a 1.2L engine, may have a condition that could cause the… |
| 22-NA-007 | Service bulletin | Oct 4, 2025 | This service bulletin provides procedures to correct customer concerns of Poor Engine Performance in Extremely Cold Weather Conditions, Char… |
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 Buick, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is GM 19-NA-101 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 19-NA-101 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 19-NA-101 cover?
The manufacturer filed it against 15 model years across 2 brands (Chevrolet and Buick): 2019 Buick Encore, 2018 Buick Encore, 2017 Buick Encore, 2016 Buick Encore, 2016 Chevrolet Cruze, 2019 Chevrolet Sonic and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.