Porsche service campaign WRN4
What it saysPorsche intranet posting with information on WRN4 Workshop Campaign – Reworking drain hose on heating/fresh-air unit NHTSA’s full summary ↓
Porsche filed this with NHTSA as a service campaign dated Jul 16, 2025, received Aug 6, 2025, about the power train — 2 documents under this number: No. 134-24 and 1 more. It names 2 model years (2025–2026). 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 WRN4 Workshop Campaign – Reworking drain hose on heating/fresh-air unit
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| WRN4 | Service campaign | Jul 16, 2025 | 11021679 | PDF, 12 KB |
| No. 134-24 | Service campaign | Jul 15, 2025 | 11021599 | PDF, 2,598 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 2 model years this bulletin names have filed 2 complaints with NHTSA since 2015. 1 of them name Power Train — 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.
The car suffered a critical electrical failure which resulted in the car abruptly losing power when driving at a speed of about 30 mph. The speed at which the car became unresponsive was so rapid that the car could not even be maneuvered from the middle lane into the right most lane for safety.
2025 Porsche Taycan · Power Train · filed with NHTSA Nov 20, 2025 · ODI 11700474
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 power train
Source: same model, same component group14 other manufacturer communications filed against the Porsche Taycan under the same component group (power train), newest first. The eight newest are listed; the rest are on the Porsche list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| WTL5 | Over-the-air update | Aug 24, 2026 | Porsche intranet posting for Campaign WTL5 Over-the-Air (OTA) Update– Reprogramming the high-voltage battery control unit (BMCe) |
| No. D780 | Service bulletin | Apr 17, 2026 | Parts information for parts withdrawal involving the transmission oil. Part number 00004321012 is affected - the vehicles that use this part… |
| No. 13-25 | Service bulletin | Apr 2, 2026 | Installation and conversion instructions for Sports Exhaust System - Silver (0P8) / Dark Bronze (0P9). The affected vehicle is the Cayenne T… |
| No. D768.1 | Service bulletin | Mar 5, 2026 | Parts information for parts withdrawal involving the transmission fluid. Part number 00004321048. The cars affected are ones that use the pa… |
| No. D768 | Service bulletin | Feb 27, 2026 | Parts information for parts withdrawal involving the (00004321048) Transmission fluid. The vehicles affected are ones that use the part numb… |
| No. D761 | Service bulletin | Feb 12, 2026 | Parts information for parts withdrawal involving the 7 speed dual clutch gear box. Part numbers 0BG300047 and 0BG300047X are affected. Cars… |
| No. WSQ8 | Service campaign | Dec 3, 2025 | Technical information for workshop campaign WSQ8 – Replacing Disc Wheels On Front Axle |
| No.60-25 | Service bulletin | Nov 11, 2025 | Symptom-based workshop manual for "Tweeting" From the Rear End Area for Light-Duty Driving Between 60 - 80 km/h (37 - 49 mph) and From Appro… |
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 WRN4 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 WRN4 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 WRN4 cover?
The manufacturer filed it against 2 model years: 2026 Porsche Taycan, 2025 Porsche Taycan. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.