Subaru bulletin 15-340-26
What it saysThis bulletin announces the availability of reprogramming files for the Central Electronic Control Module (C-ECM). NHTSA’s full summary ↓
Subaru filed this with NHTSA as a service bulletin dated Jul 31, 2026, received Aug 4, 2026, about the electrical system. It names 1 model year (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 communicationThis bulletin announces the availability of reprogramming files for the Central Electronic Control Module (C-ECM). The updated logic has been developed to address Diagnostic Trouble Code (DTC) B2A20 - LOST COMMUNICATION ETHERNET FROM DCM TO HU.
Trouble codes it names: B2A20
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| 15-340-26 | Service bulletin | Jul 31, 2026 | 11035662 | PDF, 458 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 1 model year this bulletin names have filed 16 complaints with NHTSA since 2015. 5 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.
New car with only 965 miles. At 580 miles the car when I started it said safety eyesight system not working. I shut off car and restarted it and system connected itself. Today I was on highway doing 62mph and the entire dashboard, information and safety features displays went completely black without any warning.
2026 Subaru Outback · Electrical System · filed with NHTSA Sep 9, 2026
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 group97 other manufacturer communications filed against the Subaru Outback under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Subaru list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| 15-342-26 | Service bulletin | Aug 31, 2026 | This bulletin announces an inspection procedure for the Smart Rear View Mirror Assembly. |
| 15-261-20R | Service bulletin | Aug 31, 2026 | This bulletin announces reprogramming file availability and provides a software update installation procedure to optimize the new Gen 4 Dens… |
| 15-308-23R | Service bulletin | Aug 20, 2026 | This Service Information Bulletin outlines a systematic procedure for diagnosing parasitic draw (dark/standby current) in vehicles experienc… |
| 15-305-22R | Service bulletin | Aug 20, 2026 | This bulletin announces a reprogramming file availability and provides a software update installation procedure to optimize the new Gen 4.5… |
| 15-331-25R | Service bulletin | Aug 14, 2026 | This Bulletin has been developed to outline the steps for gathering basic but essential information during diagnosis of Infotainment concern… |
| 15-304-22R | Service bulletin | Aug 13, 2026 | This Bulletin has been developed to outline the steps for gathering basic but essential information during diagnosis of Infotainment concern… |
| 15-333-25R | Service bulletin | Aug 1, 2026 | This bulletin contains illustrations of exchange components and their manufacturer as well as a description of the proper exchange procedure… |
| 16-159-26 | Service bulletin | Jul 23, 2026 | This bulletin provides new diagnostic steps for DTC P0851 and P0852 to be used in conjunction with the applicable Service Manual. |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Subaru, by the number printed on the letter.
Common questions
Source: NHTSA, 49 CFR 579.5Is Subaru 15-340-26 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 15-340-26 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.
Which vehicles does 15-340-26 cover?
The manufacturer filed it against 1 model year: 2026 Subaru Outback. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.