Mercedes-Benz bulletin LI46.10-P-078012
Mercedes-Benz filed this with NHTSA as a service bulletin dated Jul 17, 2026, received Jul 30, 2024, about the electrical system — 7 documents under this number. It names 95 model years (2017–2025). 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 communicationComplaint Hand detection system – malfunction / vehicles with code 266 Fault message in instrument cluster: "Active Emergency Stop Assist not available" "Active Lane Keeping Assist not available" "Active steering assist not available" Cause Possible causes: Hand detection mat, hand detection control unit, contacts, and electrical feed line. Remedy In the event of a customer complaint and fault code in IDC control unit: U186B29 in IDC223 or fault code U0429E0, U042941, U042929, U042902, U0429E1 in IDC213 or fault code in HOSWD control unit: B1E7614 Check: Please do not replace the HOSWD control unit. Please flash the new SW and perform the SCN coding for the HOSWD control unit (N179/1) (available from July 2026). The software can be flashed onto all HOSWD213 with HW number A0009011522 and all HOSWD223 with HW number A0009011422. Please also flash the SW for the IDC control unit (N62/4), if possible (only applies to HOSWD223). Erase fault memory Remedy: Turn on the ignition or start the engine without touching the steering wheel. If, after 10 seconds without touching the steering wheel, one of the three fault messages appears on the instrument cluster: Check the contacts and feed lines in the steering wheel by means of a visual inspection for damage, crimp connections, loose connections, etc. (example in picture 2 and 3). If there is visible damage -> replace the steering wheel electronics or the feed lines. If there is not any visible damage -> replace the steering wheel rim. If a yellow message does not appear on the instrument cluster within 10 seconds: Grasp the steering wheel fully with both hands, including the chrome molding at the 6 o'clock position (see picture 1). If the fault is triggered by grasping the steering wheel rim or pressing the clip at the 6 o'clock position, check the contacts and feed lines in the steering wheel by means of a visual inspection for damage, kinked connections, loose connections, etc. (example in picture 2 and 3). Check the ground connections (screw connections and cables to the steering wheel rim); if necessary, retighten the screws/bolts and check for corrosion (picture 4). If there is visible damage -> replace the steering wheel electronics or the feed lines. If there is not any visible damage: Replace the steering wheel rim. Please do not replace the HOSWD control unit. A TIPS case should be created if fault profile is
Documents filed under this number
| Document | Kind | Dated | NHTSA id |
|---|---|---|---|
| LI46.10-P-078012 | Service bulletin | Jul 17, 2026 | 11035120 |
| LI46.10-P-078012 | Service bulletin | Jul 26, 2025 | 11021143 |
| LI46.10-P-078012 | Service bulletin | May 2, 2025 | 11018204 |
| LI46.10-P-078012 | Service bulletin | Apr 11, 2025 | 11017516 |
| LI46.10-P-078012 | Service bulletin | Feb 3, 2025 | 11013996 |
| LI46.10-P-078012 | Service bulletin | Jan 6, 2025 | 11012806 |
| LI46.10-P-078012 | Service bulletin | Jul 15, 2024 | 11005334 |
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 themand 41 more model years on this site.
Also filed against model years this site has no page for: 2024 Mercedes-Benz AMG C63 S E; 2025 Mercedes-Benz AMG E 53 4MATIC+ Wagon; 2021 Mercedes-Benz AMG E53 S; 2020 Mercedes-Benz AMG GT43; 2023 Mercedes-Benz AMG S 63 E; 2024 Mercedes-Benz AMG S 63 E; 2022 Mercedes-Benz AMG SL43; 2020 Mercedes-Benz AMG SL63; 2024 Mercedes-Benz AMG SL63 S E; 2025 Mercedes-Benz E 450 4MATIC ALL-Terrain; 2024 Mercedes-Benz Redundant EQE 350; 2023 Mercedes-Benz Redundant EQE 350 4MATIC; 2023 Mercedes-Benz Redundant EQS 450; 2024 Mercedes-Benz Redundant EQS 450.
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 Mercedes-Benz LI46.10-P-078012 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 LI46.10-P-078012 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 LI46.10-P-078012 cover?
The manufacturer filed it against 95 model years: 2022 Mercedes-Benz A-Class, 2021 Mercedes-Benz A-Class, 2020 Mercedes-Benz A-Class, 2019 Mercedes-Benz A-Class, 2025 Mercedes-Benz AMG GT, 2024 Mercedes-Benz AMG GT and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.