Porsche service campaign WNH2
What it saysPorsche intranet posting with information on WNH2 - reprogramming DME control unit NHTSA’s full summary ↓
Porsche filed this with NHTSA as a service campaign dated Aug 23, 2025, received Sep 8, 2025, about the engine — 2 documents under this number: No. 166-23 and 1 more. It names 6 model years (2017–2019). A service campaign is not a safety recall — there is no NHTSA campaign number and no federal requirement — but it is usually work the manufacturer pays for on the vehicles it names; the dealer checks the VIN against the manufacturer’s list.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationPorsche intranet posting with information on WNH2 - reprogramming DME control unit
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| WNH2 | Service campaign | Aug 23, 2025 | 11023016 | PDF, 11 KB |
| No. 166-23 | Service campaign | Aug 21, 2025 | 11022927 | PDF, 367 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 themA 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 6 model years this bulletin names have filed 10 complaints with NHTSA since 2015. 1 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.
I sustained serious burns to my calf from my the exhausts on my 2014 boxster s, and my 2017 Cayman, on two occasions. Both cars suffer from the same dangerous design defect: an excessively protruding central exhaust pipe.
2017 Porsche Cayman · Engine · filed with NHTSA Oct 12, 2018 · ODI 11140061
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 group84 other manufacturer communications filed against these Porsche models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Porsche list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| No. 27-26 | Service bulletin | Sep 22, 2026 | Manufacturer's Certificate for Overview of Approved Porsche C20 Engine Oils. Note that the bulletin covers all models back to model year 198… |
| No. 25-26 | Service bulletin | Sep 22, 2026 | Manufacturer's Certificate for Overview of Approved Porsche A40 Engine Oils. Note that this bulletin covers all vehicles from model year 199… |
| 13/26 | Service bulletin | Jul 22, 2026 | Allocation of Approved Engine Oils MY 2027 (13/26) |
| 21/26 1701 | Other | Jun 25, 2026 | Overview of Approved Porsche C40 Engine Oils (21/26) |
| 20/26 | Other | Jun 25, 2026 | Overview of Approved Porsche C20 Engine Oils (20/26) |
| 19/26 1701 | Other | Jun 25, 2026 | Overview of Approved Porsche C30 Engine Oils (19/26) |
| 18/26 1701 | Other | Jun 25, 2026 | Overview of Approved Porsche C40 Engine Oils (18/26) |
| 17/26 1701 | Other | Jun 25, 2026 | Overview of Approved Porsche C20 Engine Oils (17/26) |
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 WNH2 a recall?
No. A service campaign 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 WNH2 repair free?
A service campaign is usually paid by the manufacturer on the vehicles it names, within the terms and time limit the document sets; the dealer checks the VIN against the manufacturer’s list.
Which vehicles does WNH2 cover?
The manufacturer filed it against 6 model years: 2019 Porsche Boxster, 2018 Porsche Boxster, 2017 Porsche Boxster, 2019 Porsche Cayman, 2018 Porsche Cayman, 2017 Porsche Cayman. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.