Mercedes-Benz service campaign NCU - 2026010004
Mercedes-Benz filed this with NHTSA as a service campaign dated Jul 27, 2026, received Jan 22, 2026, about the engine — 2 documents under this number. It names 3 model years (2020–2021). A service campaign is not a safety recall — there is no NHTSA campaign number and no federal requirement — but it is usually work the manufacturer pays for on the vehicles it names; the dealer checks the VIN against the manufacturer’s list.
What the bulletin says
Source: NHTSA's summary of the manufacturer's communication• Always use the latest XENTRY Diagnosis software release with all available add-ons. • Make sure to follow the operation steps exactly as described in XENTRY Diagnosis! • Use a battery charger to ensure sufficient power supply of the vehicle on-board electrical system battery (greater than 12.5 V). • If XENTRY Diagnosis is already connected to the vehicle, start with operation step 2. If two or more software updates or SCN coding’s are performed during one workshop visit or SCN coding operations are performed, operation items 02-4762 and 02-5058 must only be invoiced once for each workshop order! Work Procedure: 1. Connect XENTRY Diagnosis. 2. Update engine electronics (ME) control unit software. To do so, select menu item "Quick test view → N3/10 - Engine electronics 'MED40' for combustion engine 'M274' (ME) → Adaptations → Control unit update → Update of control unit software". Then follow the user guidance in XENTRY Diagnosis. 3. Disconnect XENTRY Diagnosis.
Documents filed under this number
| Document | Kind | Dated | NHTSA id |
|---|---|---|---|
| NCU - 2026010004 | Service campaign | Jul 27, 2026 | 11035270 |
| NCU - 2026010004 | Service campaign | Jan 23, 2026 | 11027757 |
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: 2021 Mercedes-Benz E 350 E.
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 NCU - 2026010004 a recall?
No. A service campaign 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 NCU - 2026010004 repair free?
A service campaign is usually paid by the manufacturer on the vehicles it names, within the terms and time limit the document sets; the dealer checks the VIN against the manufacturer’s list.
Which vehicles does NCU - 2026010004 cover?
The manufacturer filed it against 3 model years: 2021 Mercedes-Benz E-Class, 2020 Mercedes-Benz GLC-Class, 2021 Mercedes-Benz E 350 E. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.