Mercedes-Benz service campaign NCU - 2026020005
What it saysMercedes-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… NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service campaign dated Feb 28, 2026, received Feb 27, 2026, about the engine. 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.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationPicked out of NHTSA’s summary below, word for word. The document itself is the record, and the dealer checks the VIN.
Mercedes-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 | PDF, 432 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 themAlso filed against model years this site has no page for: 2022 Mercedes-Benz AMG SL43.
A 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 8 model years this bulletin names have filed 89 complaints with NHTSA since 2015. 45 of them name Engine, 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.
My back up camera badge located at the trunk has been permanently stuck open for a few months now when I put car in reverse the screen shows my camera for 2 seconds then disappears and goes back to my Home Screen I brought to the dealer and they told me I need a new battery I replaced my battery paid almost 400 dollars and it still…
2020 Mercedes-Benz CLA-Class · Electrical System · filed with NHTSA Sep 12, 2025 · ODI 11686937
I own a 2022 Mercedes Benz GLA 250 2022. in , it was pouring rain and I was driving from to attain to drive home. It was pouring that night and driving conditions were horrible. I was in the middle lane driving roughly 55-65 mph. about 15 minutes into my drive a light on dash came " engine chip malfunction" and the car died.
2022 Mercedes-Benz GLA-Class · Engine · filed with NHTSA Mar 20, 2026 · ODI 11725944
The contact owns a 2022 Mercedes-Benz AMG SL55. The contact stated that upon entering the vehicle, the vehicle failed to detect the presence of the key, after which the vehicle failed to start. No warning lights were illuminated. The vehicle was taken to the dealer, who was unable to determine the cause of the failure.
2022 Mercedes-Benz SL-Class · Electrical System · filed with NHTSA Aug 19, 2024 · ODI 11609466
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 engine
Source: same model, same component group30 other manufacturer communications filed against these Mercedes-Benz models under the same component group (engine), newest first. The eight newest are listed; the rest are on the Mercedes-Benz list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI01.20-P-080884 | Service bulletin | Aug 12, 2026 | Complaint Oil leaks found on M176 or M177 engines diagnosed to be from the cylinder head cover area Cause Unknown (under investigation) Reme… |
| LI07.10-P-080384 | Service bulletin | Aug 7, 2026 | Complaint Customer reports Check Engine Light with possible loss of power concern. The Following DTC's are present • P210185 - The throttle… |
| PSL-NCU Return Parts 7/24 | Other | Jul 24, 2026 | Dear Mercedes-Benz USA Dealers, The part numbers listed in the chart below should no longer be installed, and any existing stock must be ret… |
| LI20.10-P-072886 | Service bulletin | Jul 24, 2026 | Complaint Check Engine Light ON with DTC P012800 "The Coolant Temperature is Below the Specified Temperature" active and/or stored in the ME… |
| NCU - 2026040007 | Service campaign | May 8, 2026 | Mercedes-Benz AG (MBAG), the manufacturer of Mercedes-Benz vehicles, has determined that on certain Model Year (MY) 2024 CLA (118 platform)… |
| CL - 2026010005 | Other | Apr 18, 2026 | Dear Mercedes-Benz Owner: On behalf of Mercedes-Benz USA, LLC (“MBUSA”), thank you for being a part of the Mercedes-Benz family. We hope tha… |
| LI07.70-P-078293 | Service bulletin | Apr 9, 2026 | Complaint Customer states CEL ON with no drivability complaints Cause The following DTC is active and/or stored in the ME (N3/10) due to sig… |
| Emissions - 2026010005 | Emissions | Apr 2, 2026 | Mercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain subject vehicles equipped with M139 gasoline en… |
Quote the number at the service desk. It is what the dealer’s system is keyed on.
Every manufacturer communication NHTSA holds for Mercedes-Benz, by the number printed on the letter.
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.