Ram bulletin 08-394-25
Ram filed this with NHTSA as a service bulletin dated Dec 12, 2025, received Dec 11, 2025, about the electrical system — 2 documents under this number: 08-394-25 REV. A. It names 30 model years (2022–2026). 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.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationTelematics Box Module (TBM) Backup Battery Replacement When DTC B1E21 Is Present Technicians may experience a Malfunction Indicator Lamp (MIL) illumination and the vehicle may exhibit/set the following Diagnostic Trouble Code (DTC): â—� B1E21-96 - Backup Battery Component Internal Failure.
Documents filed under this number
| Document | Kind | Dated | NHTSA id |
|---|---|---|---|
| 08-394-25 REV. A | Service bulletin | Dec 12, 2025 | 11026677 |
| 08-394-25 | Service bulletin | Dec 5, 2025 | 11026549 |
The summary is NHTSA’s abstract of the document, as filed under 49 CFR 579.5; the full text comes from the manufacturer or a dealer. 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. Quote it at a service desk; it is what the dealer’s system is keyed on.
Model years it names
Source: as the manufacturer filed themAlso filed against model years this site has no page for: 2022 Ram 4500; 2023 Ram 4500; 2024 Ram 4500; 2025 Ram 4500; 2026 Ram 4500; 2022 Ram 5500; 2023 Ram 5500; 2024 Ram 5500; 2025 Ram 5500; 2026 Ram 5500.
A vehicle page’s bulletin list shows the newest few communications filed against that model year; the count there is every one.
Common questions
Source: NHTSA, 49 CFR 579.5Is Ram 08-394-25 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 08-394-25 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 08-394-25 cover?
The manufacturer filed it against 30 model years: 2026 Ram 1500, 2025 Ram 1500, 2024 Ram 1500, 2023 Ram 1500, 2022 Ram 1500, 2026 Ram 2500 and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.