Mercedes-Benz service campaign NCU - 2026020005
Mercedes-Benz filed this with NHTSA as a service campaign dated Feb 28, 2026, received Feb 27, 2026, about the electrical system. It names 9 model years (2020–2022). 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 communicationMercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles, the control unit software for the engine electronics does not correspond to the current series production configuration. This may cause the electrical fault diagnosis of the lambda sensor to not operate as intended, so that in the event of a fault, the check engine indicator lamp may not illuminate. MBUSA will conduct a service campaign. An authorized Mercedes-Benz dealer will update the software for the engine electronics control unit on the affected vehicles.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| NCU - 2026020005 | Service campaign | Feb 28, 2026 | 11029057 | not yet checked |
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 themAlso filed against model years this site has no page for: 2022 Mercedes-Benz AMG SL43; 2020 Mercedes-Benz AMG SL63.
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 - 2026020005 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 - 2026020005 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 - 2026020005 cover?
The manufacturer filed it against 9 model years: 2022 Mercedes-Benz CLA-Class, 2021 Mercedes-Benz CLA-Class, 2020 Mercedes-Benz CLA-Class, 2022 Mercedes-Benz GLA-Class, 2021 Mercedes-Benz GLA-Class, 2020 Mercedes-Benz GLA-Class and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.