Porsche bulletin 88/20 3734
What it saysComplaint - Oil Leakages on Double-Clutch Transmission (Porsche Doppelkupplung (PDK)): Observe Specified Procedure (88/20) NHTSA’s full summary ↓
Porsche filed this with NHTSA as a service bulletin dated Jun 9, 2026, received Jul 7, 2026, about the power train. It names 7 model years (2020–2026). 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 communicationComplaint - Oil Leakages on Double-Clutch Transmission (Porsche Doppelkupplung (PDK)): Observe Specified Procedure (88/20)
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 88/20 3734 | Service bulletin | Jun 9, 2026 | 11034601 | PDF, 1,515 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 7 model years this bulletin names have filed 37 complaints with NHTSA since 2015. 5 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.
On XXX, less than 24 hours after an authorized Porsche dealer released this 2024 911 as a successfully completed repair with the diagnostic codes cleared and no root cause documented, the vehicle suddenly lost motive power while traveling at highway speed.
2024 Porsche 911 · Power Train · filed with NHTSA Jul 11, 2026 · ODI 11749681
While operating my brand new 2026 911 GT3 Touring manual with just 37 miles on the odometer, the clutch line suddenly separated from the slave cylinder. This caused an immediate losss of clutch pressure and hydraulic fluid.
2026 Porsche 911 · Power Train · filed with NHTSA Sep 18, 2026 · ODI 11765384
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 group26 other manufacturer communications filed against the Porsche 911 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 |
|---|---|---|---|
| No. 91-26 | Service bulletin | Sep 24, 2026 | Technical Information for Particles/Metal Chips/Residues in Engine Oil |
| SY No. 72-26 | Service bulletin | Sep 23, 2026 | Symptom-based workshop manual for High-Pitched “Whining” and Whistling Noises in Partial Load Operation from the Engine Area. Note that this… |
| No. 72-26 | Service bulletin | Sep 23, 2026 | Symptom-based workshop manual for High-Pitched “Whining” and Whistling Noises in Partial Load Operation from the Engine Area. Note that this… |
| No. 28-26 | Service bulletin | Sep 22, 2026 | Technical information on Transmission Warning Message “P Not Available”, Fault Memory Entries for Parking Lock Buttons in the Shift Console… |
| No. 26-26 | Service bulletin | Sep 22, 2026 | Manufacturer's Certificate for Overview of Approved Porsche C30 Engine Oils. Note that the bulletin includes all models back to model year 1… |
| 18/26 | Warranty extension | Jul 23, 2026 | Warranty Information: Warranty Extension for Transmission Electronics Control Unit (18/26) |
| 09/26 3730 | Service bulletin | Jun 30, 2026 | Permanent Fault Memory Entries “P1775”/“P071400”/“P184900” in Transmission Electronics Control Unit (PDK) (09/26) |
| GR12D787 | Other | Jun 18, 2026 | Parts Withdrawal - Drive Shaft |
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 88/20 3734 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 88/20 3734 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 88/20 3734 cover?
The manufacturer filed it against 7 model years: 2026 Porsche 911, 2025 Porsche 911, 2024 Porsche 911, 2023 Porsche 911, 2022 Porsche 911, 2021 Porsche 911 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.