Porsche bulletin No. 2309.3
What it saysInstructions on advanced technical information for 718 GTS 4.0 - Brake Booster (Power Brake) Warning in Instrument Cluster NHTSA’s full summary ↓
Porsche filed this with NHTSA as a service bulletin dated Apr 17, 2026, received May 7, 2026, about the service brakes. It names 5 model years (2021–2024). 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 communicationInstructions on advanced technical information for 718 GTS 4.0 - Brake Booster (Power Brake) Warning in Instrument Cluster
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| No. 2309.3 | Service bulletin | Apr 17, 2026 | 11032392 | PDF, 1,524 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 themAlso filed against model years this site has no page for: 2022 Porsche Redundant Cayman.
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 8 complaints with NHTSA since 2015. 4 of them name Service Brakes, 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.
I was traveling North on the 127 expressway in Michigan on Wednesday, May 10, 2023 in my brand new Porsche Boxster. It is a manual transmission. There was not a lot of traffic. It was maybe around 4:00 pm and the weather was fine. In the distance I could see a lane closure marked by orange and white barrels. I was going 70 mph.
2023 Porsche 718 · Service Brakes · filed with NHTSA Jun 2, 2023 · ODI 11525017
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 service brakes
Source: same model, same component group12 other manufacturer communications filed against these Porsche models under the same component group (service brakes), newest first. The eight newest are listed; the rest are on the Porsche list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| GR13D798 | Service bulletin | Jul 15, 2026 | Parts Withdrawal - Brake Disc |
| No. D752 | Service bulletin | Jan 5, 2026 | Parts information for parts withdrawal involving the caliper without brake pads. The part numbers affected are in the attached PDF. The vehi… |
| No. D749 | Service bulletin | Nov 18, 2025 | Parts information for parts withdrawal involving the brake disc 9Y0615301AJ |
| D719 | Service bulletin | May 5, 2025 | Parts information for Parts Withdrawal - 1 Set of Brake Pads for Disk Brake. Vehicles included are all cars that use part number 992698451R |
| No. D689 | Service bulletin | Jul 25, 2024 | Parts information for parts withdrawal involving the brake hose 9J1611707F and 9J1611708F |
| No. D684 | Service bulletin | Jun 17, 2024 | Parts information for parts withdrawal involving the retainer for brake hose/brake line |
| No. D681 | Service bulletin | May 28, 2024 | Parts information for parts withdrawal involving the retainer for brake hose/pressure difference sender.… |
| No. D677 | Service bulletin | Apr 14, 2024 | Parts information for parts withdrawal involving the brake pads - 992698151F |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Porsche, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Porsche No. 2309.3 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 No. 2309.3 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 Porsche warranty extension on file lists the ones Porsche has filed.
Which vehicles does No. 2309.3 cover?
The manufacturer filed it against 5 model years: 2024 Porsche 718, 2023 Porsche 718, 2022 Porsche 718, 2021 Porsche 718, 2022 Porsche Redundant Cayman. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.