Mercedes-Benz bulletin LI54.71-P-080345
What it saysComplaint Brief (a few seconds), self-healing "driver assistance systems unavailable" messages are expected and normal due to system limitations and environmental effects. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated May 19, 2026, received Apr 10, 2026, about the electrical system — 2 documents under this number. It names 1 model year (2026). 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.
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What the bulletin says
Source: NHTSA's summary of the manufacturer's communicationWhat it applies to, as the document itself states it — the build window in the manufacturer’s own words, read by machine from the PDF NHTSA serves. The build date is on the certification label in the driver’s door jamb; the dealer settles a borderline vehicle by its VIN.
Complaint Brief (a few seconds), self-healing "driver assistance systems unavailable" messages are expected and normal due to system limitations and environmental effects. This can occur during startup of the vehicle but also during driving. No case is necessary for these. Please refer to the Owner's Manual for driver assistance system limitations and environmental effects. For "driver assistance systems unavailable" that are persistent or show on every key cycle AND Vehicle was produced prior to February 27, 2026. Cause Cause 1: In rare cases, one or more of the fault codes U05B555, U05B655, U05B755 or U05B855 (implausible data was received from the front/rear outer right/left radar sensor. The component part is not configured.) is "Active" in the N62/5 control unit. This cause mainly occurs in vehicles produced prior to September 5, 2025. Cause 2: The initial calibration of the acceleration sensor (IMU) in the N62/5 control unit was not performed/completed. There is no relevant fault code active in the N62/5 control unit. This cause mainly occurs in vehicles produced prior to February 27, 2026. Remedy Remedy 1: Navigate to N62/5 control unit via XENTRY and carry out: "Adaptations > Teach-in processes > Calibration of the N62/5 control unit (driver assistance system control unit)." If it is not possible to perform this process or the system is recognizing that all sensors are already calibrated and nothing further needs to be completed, we alternatively recommend carrying out "Calibration drive after exchange of the component part front bumper or rear bumper" under Teach-in processes. Once the calibration is started, the calibration screen will appear on the head unit. Xentry will instruct the user to disconnect the device from the vehicle and perform the driving calibration. XENTRY MUST be disconnected and cannot be left connected. Remedy 2: Navigate to N62/5 control unit via XENTRY and carry out: "Adaptations > Teach-in processes > Calibration of the N62/5 control unit (driver assistance system control unit)." If there are no identified calibrations, perform calibration drive for the N62/5 control unit. No XENTRY diagnostic device is required for this, as the calibration does not need to be initiated via XENTRY! Perform a calibration drive of at least 5 minutes and at least 20 turns (left/right evenly distributed) without interrupting the drive (stop and
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI54.71-P-080345 | Service bulletin | May 19, 2026 | 11032891 | PDF, 41 KB |
| LI54.71-P-080345 | Service bulletin | Apr 4, 2026 | 11031254 | PDF, 89 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.
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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 1 complaint with NHTSA since 2015. 3 of them name Forward Collision Avoidance — 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.
While driving at 50mph, the vehicle came to a full stop in 2 seconds by auto breaking (to avoid collision) when there was no object or vehicle in front of the car. I almost got rear-ended as stopping from 50mph to 0 mph on a highway was extremely dangerous but luckily the car behind me was able to use the lane to my right to avoid the…
2026 Mercedes-Benz CLA-Class · Forward Collision Avoidance · filed with NHTSA Aug 20, 2026 · ODI 11758250
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 group70 other manufacturer communications filed against the Mercedes-Benz CLA-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 |
|---|---|---|---|
| LI46.00-P-081006 | Service bulletin | Sep 29, 2026 | Complaint The vehicle pulls to the left or right. Cause In vehicles with Car Package Release "CPR" 2.1.0 or prior, the calibration value for… |
| LI54.71-P-080956 | Service bulletin | Sep 25, 2026 | Complaint 174 with MB. OS 2.1.1 ‑ Driver Assistance System Limited in Instrument Cluster and Does Not Self‑Extinguish. When vehicle is shut… |
| LI82.60-P-080383 | Service bulletin | Sep 15, 2026 | Complaint Radio station cover art does not refresh when switching stations. The UI continues to show the old station’s artwork instead of up… |
| 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… |
| LI54.30-P-080709 | Service bulletin | Sep 5, 2026 | Complaint Display message in the instrument cluster for "Active Brake Assist Inoperative" or "DISTRONIC inoperative". AND Fault code C1100FC… |
| LI27.19-P-080869 | Service bulletin | Aug 29, 2026 | Complaint Temporary no start condition with check engine light and multiple warning messages. When performing a quick test, the following fa… |
| LI82.90-P-080891 | Service bulletin | Aug 13, 2026 | Complaint • Driving assistance system fault messages are displayed in the driver display. • The switch lighting flashes at night/in the dark… |
| 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… |
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 LI54.71-P-080345 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 LI54.71-P-080345 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. Every Mercedes-Benz warranty extension on file lists the ones Mercedes-Benz has filed.
Which vehicles does LI54.71-P-080345 cover?
The manufacturer filed it against 1 model year: 2026 Mercedes-Benz CLA-Class. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone. The document itself sets the build window: built before 27 Feb 2026; built before 5 Sep 2025 — the build date is on the certification label in the driver’s door jamb.