Mercedes-Benz service campaign NCU - 2021110012
What it saysMercedes-Benz AG, the manufacturer of Mercedes-Benz vehicles, has determined that on certain MY 2021 G-Class (463 platform) vehicles, the engine control unit software for camshaft adjustment does not meet the current… NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service campaign dated Dec 20, 2024, received Jan 2, 2025, about the electrical system. It names 1 model year (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.
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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 MY 2021 G-Class (463 platform) vehicles, the engine control unit software for camshaft adjustment does not meet the current series production specifications. An authorized Mercedes-Benz dealer will update the engine control unit software.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| NCU - 2021110012 | Service campaign | Dec 20, 2024 | 11012129 | PDF, 250 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 themA 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 1 model year this bulletin names have filed 9 complaints with NHTSA since 2015. 9 of them name Electrical System, Engine — 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.
Shortly after purchasing a new Mercedes Benz 2021 G550 on , the SUV started having electrical problems. During early 2022 the vehicle shut off while at a red light and would not restart until a few minutes later. No warning light or error message was seen and when taken to the dealership they could not find anything wrong.
2021 Mercedes-Benz G-Class · Electrical System · filed with NHTSA Jun 5, 2024 · ODI 11592609
Driving 2021 Mercedes-Benz G-550 for approximately 8min. Preceding East on a 3 lane South Florida Highway no more than 40 mph. Gas tank 75% full with V-Power From Shell. (filled-3 days prior).
2021 Mercedes-Benz G-Class · Electrical System · filed with NHTSA Sep 21, 2022 · ODI 11485579
Front Door harness rubs and frays causing the wires to short out. The front windows and door locks work intermittently. SRS failure lights up on dash
2021 Mercedes-Benz G-Class · Electrical System · filed with NHTSA Oct 1, 2026 · ODI 11768237
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 electrical system
Source: same model, same component group39 other manufacturer communications filed against the Mercedes-Benz G-Class under the same component group (electrical system), newest first. The eight newest are listed; the rest are on the Mercedes-Benz list.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| ANN - Tech. Aware. G580e | Other | Sep 21, 2026 | Tech. Awareness: G580e 465.600/465.601 - ISU For Model G580e 465.600/465.601 - Please be aware that initial start up of N147/10n1, N147/10n2… |
| LI54.10-P-080684 | Service bulletin | Sep 17, 2026 | Complaint When disconnecting or connecting the charging connector, the charging socket flashes red and red warning messages are displayed in… |
| LI54.21-P-080326 | Service bulletin | Sep 9, 2026 | Complaint CEL light on with no drivability concerns. Cause Signal timing error. Remedy 167, 465: SW has been released. Update the FSAM to th… |
| LI54.65-P-080132 | Service bulletin | Aug 12, 2026 | Complaint 1. General Diagnostic Tips 2. One or More PARK Sensor Activations 3. Red Ring Around Vehicle 4. "Active Parking and Parking Assist… |
| LI82.85-P-079087 | Service bulletin | Aug 6, 2026 | Complaint A popup is seen on the HU with the message "data connection temporarily not available". Potentially affected functionalities in NT… |
| PSL-NCU Return Parts 7/17 | Other | Jul 17, 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… |
| LI00.20-P-077615 | Service bulletin | Jul 1, 2026 | The following symptoms may be present in the instrument cluster: 1. "Perform vehicle handover" in the workshop menu to start the maintenanc… |
| LI00.20-P-080703 | Service bulletin | Jun 12, 2026 | Complaint Service code B1 displayed in the customer menu does not match the workshop code displayed in the workshop menu, e.g., 505 or 550A… |
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 - 2021110012 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 - 2021110012 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 - 2021110012 cover?
The manufacturer filed it against 1 model year: 2021 Mercedes-Benz G-Class. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.