Porsche service campaign WTK4
What it saysTechnical Information for Campaign WTK4 – Reset Vehicle Electrical System Battery NHTSA’s full summary ↓
Porsche filed this with NHTSA as a service campaign dated Sep 1, 2026, received Oct 2, 2026, about the electrical system — 2 documents under this number: No. WTK4 and 1 more. It names 3 model years (2019–2021). 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 communicationTechnical Information for Campaign WTK4 – Reset Vehicle Electrical System Battery
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| WTK4 | Service campaign | Sep 1, 2026 | 11037860 | PDF, 11 KB |
| No. WTK4 | Service campaign | Sep 1, 2026 | 11037858 | PDF, 85 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 3 model years this bulletin names have filed 93 complaints with NHTSA since 2015. 21 of them name 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.
2019 Porsche Cayennes (and other Porsche models) have LiFe P04 lithium batteries that have an internal Battery Control Module that causes a "Battery Low " indication. Porsche has been updating the software/ firmware for this module, only for it to fail again. Eventually, the battery will fail, lose charge, and become dead.
2019 Porsche Cayenne · Electrical System · filed with NHTSA Nov 13, 2023 · ODI 11554814
Battery completely discharged and the safety switch in the battery malfunctions and battery can not be charged again. There are many complaints seen online about the battery problems Porsche has. This strands the car and me the driver. The dealer and independent mechanics said the same.
2021 Porsche Cayenne · Electrical System · filed with NHTSA Aug 6, 2026 · ODI 11755286
Nearly 25% of the total time I have owned this Certified Pre-Owned vehicle (146 out of 564 days), it has been non-functional and in the shop — roughly 1 out of every 4 days of ownership.
2020 Porsche Cayenne · Electrical System · filed with NHTSA Aug 11, 2026 · ODI 11756293
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 electrical system
Source: same model, same component group234 other manufacturer communications filed against the Porsche Cayenne under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Porsche list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| No. 35-26 | Service bulletin | Sep 29, 2026 | Technical information for a Malfunction Indicator Light Active / Warning Message All-Wheel Drive Disturbed: Fault Memory Entry “U140500 - Te… |
| No. 103-25-2 | Service bulletin | Sep 23, 2026 | Technical Information for Need to Replace Components of the High-Voltage Battery - High-Voltage Battery Control Unit / Cell module; No Mixed… |
| No. 37-26 | Service bulletin | Sep 22, 2026 | Symptom based workshop manual for Information Messages Regarding Assistance System Failures, Fault Memory Entry: Implausible Chassis Number… |
| No. 86-26 | Service bulletin | Sep 9, 2026 | Technical Information for Vehicle Color in Front Display/Control Panel Wrong after Replacing Central Computer (PCM) |
| No. 84-26 | Service bulletin | Sep 9, 2026 | Technical Information for Filler Flap on Vehicles with Hybrid Drive System (PHEV) Does Not Close |
| No. 81-26 | Service bulletin | Sep 8, 2026 | Technical Information for Yellow Warning Message “All-Wheel Drive System Malfunction”, “C12BEF6” and “C133700” in the All-Wheel Electronics… |
| No. 12-26 | Service bulletin | Sep 1, 2026 | Technical information for Damage to Nano Plug Contacts Due to Utilization of Incorrect Measuring Equipment |
| No. 2109-3 | Service bulletin | Aug 28, 2026 | Information on Advanced Technical Information for Critical 12V Li-ion Battery Recycling |
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 WTK4 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 WTK4 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 WTK4 cover?
The manufacturer filed it against 3 model years: 2021 Porsche Cayenne, 2020 Porsche Cayenne, 2019 Porsche Cayenne. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.