Porsche bulletin No. 37-26
What it saysSymptom based workshop manual for Information Messages Regarding Assistance System Failures, Fault Memory Entry: Implausible Chassis Number “C12B3F3” in the Assistance Systems Control Unit NHTSA’s full summary ↓
Porsche filed this with NHTSA as a service bulletin dated Sep 22, 2026, received May 7, 2026, about the electrical system — 2 documents under this number. It names 9 model years (2016–2026). 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 communicationSymptom based workshop manual for Information Messages Regarding Assistance System Failures, Fault Memory Entry: Implausible Chassis Number “C12B3F3” in the Assistance Systems Control Unit
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| No. 37-26 | Service bulletin | Sep 22, 2026 | 11037828 | PDF, 52 KB |
| No. 37-26 | Service bulletin | Apr 29, 2026 | 11032436 | PDF, 66 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 9 model years this bulletin names have filed 27 complaints with NHTSA since 2015. 10 of them name Electrical System, Power Train, 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.
2026 Porsche Cayenne Coupe. The surround-view and rear backup camera system repeatedly fails. The screen goes completely black, including when shifting into reverse. The Coupe's shortened, sloped rear window creates major blind spots, so the driver depends on the cameras. When they fail, there is effectively no rear visibility.
2026 Porsche Cayenne · Electrical System · filed with NHTSA Oct 20, 2026 · ODI 11772320
The cars auto idle off function that saves fuel by turning the engine off at stop signs and lights in inoperative. I have had it into multiple dealers 4 times since 12/2020 with the complaint. In my opinion there is a temperature sensor that is malfunctioning and not allowing the car to go into the fuel saving mode.
2019 Porsche 911 · Engine · filed with NHTSA Feb 11, 2021 · ODI 11395726
The front windshield and rear window glass seals have failed. Black tar like material flows and spears the windows. Especially bad when driving during summer months. Vehicle only has 6200 miles. Is out of warrenty. Dealer says repair costs at my expense. Contacted Porsche North America Customer Assistance.
2016 Porsche 911 · Visibility/Wiper · filed with NHTSA Dec 14, 2021 · ODI 11443782
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 group353 other manufacturer communications filed against these Porsche models 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. 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… |
| WTK4 | Service campaign | Sep 1, 2026 | Technical Information for Campaign WTK4 – Reset Vehicle Electrical System Battery |
| 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 No. 37-26 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. 37-26 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. 37-26 cover?
The manufacturer filed it against 9 model years: 2019 Porsche 911, 2018 Porsche 911, 2016 Porsche 911, 2026 Porsche Cayenne, 2025 Porsche Cayenne, 2024 Porsche Cayenne and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.