Porsche bulletin No. 28-23
What it saysTechnical information for a complaint - check engine warning light active in conjunction with fault memory entry. NHTSA’s full summary ↓
Porsche filed this with NHTSA as a service bulletin dated Oct 10, 2023, received Oct 5, 2023, about the wheels — 2 documents under this number. It names 14 model years (2017–2024). 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 communicationTechnical information for a complaint - check engine warning light active in conjunction with fault memory entry.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| No. 28-23 | Service bulletin | Oct 10, 2023 | 10245106 | PDF, 275 KB |
| No. 28-23 | Service bulletin | Sep 25, 2023 | 10243629 | PDF, 44 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| 9Y0907559AD | — | — | |
| 9Y0907559AF | — | — | |
| 9Y0907559F | — | — | |
| 9Y0907551P | — | — | |
| 9Y0907551Q | — | — | |
| 9Y0907551H | — | — | |
| 9Y0907559J | Working position and PCSS encryption | — | eBay Motors → |
Read by machine from the document NHTSA serves (4 pages), read Sep 30, 2026. A part number is shown only where it matches Porsche’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 themAlso filed against model years this site has no page for: 2020 Porsche Redundant Cayenne E-Hybrid.
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 13 model years this bulletin names have filed 128 complaints with NHTSA since 2015. 24 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.
While driving my 2019 Porsche Cayenne S on the freeway, the check-engine light came on, followed by a message on the dashboard that read “Engine Control fault – Driving permitted – Visit workshop.” Moments later, the vehicle suddenly lost power and decelerated from about ~75 mph to around 55 mph, even though my foot was still on the…
2019 Porsche Cayenne · Engine · filed with NHTSA Nov 9, 2025 · ODI 11698394
On my 2021 Porsche Cayenne Base, which is equipped with the 3.0L V6 EA839 engine, I brought the vehicle to the dealership for a recall service. During inspection, the dealership found a leaking water pump and quoted $8,500 for repairs. There were no visible signs of a coolant leak on the ground, indicating an internal seal failure.
2021 Porsche Cayenne · Engine · filed with NHTSA Aug 31, 2026 · ODI 11760942
The main water pump on my 2018 Porsche Panamera 4S failed prematurely. This is not a simple external coolant leak; the internal seal failed, allowing pressurized engine coolant to migrate into the vehicle's vacuum system. The coolant traveled through the vacuum lines and contaminated the vacuum solenoids and change-over valves.
2018 Porsche Panamera · Engine · filed with NHTSA Dec 8, 2025 · ODI 11703784
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 wheels
Source: same model, same component group25 other manufacturer communications filed against these Porsche models under the same component group (wheels), newest first. The eight newest are listed; the rest are on the Porsche list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| No. 33-26 | Service bulletin | Sep 29, 2026 | Technical information for AC Charging Process in the Customer’s Home Network Not Working on the Macan Electric |
| No. 2605-1 | Service bulletin | Aug 24, 2026 | Information for Advanced Technical Information on E3PA, G3 Pressure Sensor for Leveling System - Implausible Signal |
| 14/26 | Service bulletin | Jul 24, 2026 | Approved: Wheels and Tires (14/26) |
| 40/26 4407 | Service bulletin | Jun 30, 2026 | Wheel Bolt Replacement Requirement - Change from Wheel Bolts with Aluminum Washers to Wheel Bolts with Steel Washers (40/26) |
| 09/26 4400 | Service bulletin | Jun 24, 2026 | Approved: Wheels and Tires (09/26) |
| No. 164-24 | Service bulletin | May 26, 2026 | Technical information for Safety Pin for the Locking Unit on the Central Wheel Lock Cannot be Pressed In/Jammed: Observe Specified Procedure |
| No. 11-23 | Service bulletin | May 26, 2026 | Installation and conversion instructions for the trailer hitch on the Cayenne. Model years not listed - please refer to PDF for more informa… |
| No. 1506.2 | Service bulletin | Apr 23, 2026 | Instructions on advanced technical information for center-locking wheel nut tightening. |
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. 28-23 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. 28-23 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. 28-23 cover?
The manufacturer filed it against 14 model years: 2023 Porsche Cayenne, 2022 Porsche Cayenne, 2021 Porsche Cayenne, 2020 Porsche Cayenne, 2019 Porsche Cayenne, 2024 Porsche Panamera and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.