Porsche bulletin No. 2606
What it saysInformation on Advanced Technical Information for E3II V8 Cayenne – Various Assistance System Warning Messages in the Instrument Cluster due to Implausible Drivetrain Coordinator Status NHTSA’s full summary ↓
Porsche filed this with NHTSA as a service bulletin dated Aug 5, 2026, received Sep 4, 2026, about the forward collision avoidance. It names 3 model years (2024–2026). 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 communicationInformation on Advanced Technical Information for E3II V8 Cayenne – Various Assistance System Warning Messages in the Instrument Cluster due to Implausible Drivetrain Coordinator Status
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| No. 2606 | Service bulletin | Aug 5, 2026 | 11037062 | PDF, 205 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.
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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 16 complaints with NHTSA since 2015. 19 of them name Forward Collision Avoidance, Vehicle Speed Control — 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.
1. Driving Conditions & Baseline State I was operating my new 2026 Porsche Cayenne (current mileage approx. 717 miles) at highway speeds inside a tunnel near LAX. The vehicle was functioning normally under normal driving conditions until the incident occurred suddenly and without any prior warning signs. 2.
2026 Porsche Cayenne · Forward Collision Avoidance · filed with NHTSA Jun 4, 2026 · ODI 11742202
At approximately 57 miles after delivery of a new 2025 Porsche Cayenne, the Adaptive Cruise Control (ACC) and related driver-assistance safety systems failed while the vehicle was traveling at approximately 67 mph. There had been no collision, impact, or abnormal event prior to the failure.
2025 Porsche Cayenne · Forward Collision Avoidance · filed with NHTSA Mar 5, 2026 · ODI 11722337
The warning system continues to showing warnings and the Blind Spot and Adaptive Cruise Control render the car unsafe to drive. The other warnings has no impact of the functioning of the cars ability to be driven.
2026 Porsche Cayenne · Forward Collision Avoidance · filed with NHTSA Sep 24, 2026 · ODI 11766603
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 forward collision avoidance
Source: same model, same component group8 other manufacturer communications filed against the Porsche Cayenne under the same component group (forward collision avoidance), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| No. 11-25-4 | Service bulletin | Aug 25, 2026 | Technical Information for White Messages Regarding Driver Assistance Systems in Conjunction with Passive Fault Memory Entries in the ZFAS Co… |
| No. 2606-1 | Service bulletin | Aug 20, 2026 | Information on Advanced Technical Information for E3II V8 Cayenne – Various Assistance System Warning Messages in the Instrument Cluster due… |
| No. 75-25 | Service bulletin | Aug 14, 2026 | Technical information for Various White Messages Regarding Driver Assistance Systems In the Instrument Cluster/Fault Memory Entry "C12D5FA"… |
| No. 75-25-1 | Service bulletin | Nov 26, 2025 | Technical information for Various White Messages Regarding Driver Assistance Systems In the Instrument Cluster/Fault Memory Entry "C12D5FA"… |
| No. 2503.3 | Service bulletin | Nov 21, 2025 | Instructions on advanced technical information for Troubleshooting Advanced Driver Assistance Systems (ADAS) |
| No. 2503.2 | Service bulletin | Jul 22, 2025 | Instructions on advanced technical information for troubleshooting ADAs systems |
| No. 2121.3 | Service bulletin | Jul 8, 2025 | Instructions on advanced technical information for the Cayenne - ACC Dynamic Calibration Fault C110300 |
| No. 2121.2 | Service bulletin | Jul 17, 2024 | Instructions on advanced technical information for the Cayenne - dynamic calibration fault C110300 |
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. 2606 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. 2606 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. 2606 cover?
The manufacturer filed it against 3 model years: 2026 Porsche Cayenne, 2025 Porsche Cayenne, 2024 Porsche Cayenne. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.