Mercedes-Benz bulletin LI20.30-P-078333
What it saysComplaint A "Coolant level too low" warning message is shown in the instrument cluster. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Mar 21, 2025, received Aug 30, 2024, about the engine — 2 documents under this number. It names 4 model years (2022–2025). 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 communicationComplaint A "Coolant level too low" warning message is shown in the instrument cluster. Fault code P25567B ('Coolant level' sensor has detected a fault, fluid level is too low.) is stored in the signal acquisition and actuation module (SAM) control unit N10. Cause The vehicle's electric drive motor transports air into the cooling system. The air transported into the cooling system leads to the formation of an air cushion in the expansion reservoir, which in turn causes the coolant level to drop below the warning threshold of the coolant's fill level sensor when driving. After opening the closing cap, the coolant level is OK again. Remedy Replace the black cap A210 501 06 15 of the large working chamber of the expansion reservoir with a red cap A297 500 51 00 and the coolant level rises by roughly 20 mm above the MAX. marking. On vehicles in which the problem cannot be rectified by this procedure, the expansion reservoir A 243 500 41 00 is replaced by the modified container A243 500 60 00. The new expansion reservoir is to have two red closing caps A 297 500 51 00 fitted to it, and the coolant level is to be set to the MAX. marking.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI20.30-P-078333 | Service bulletin | Mar 21, 2025 | 11016022 | PDF, 934 KB |
| LI20.30-P-078333 | Service bulletin | Aug 30, 2024 | 11006690 | PDF, 881 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| A210 501 06 15 | — | — | |
| A 243 500 41 00 | — | — | |
| A 297 500 51 00 | — | — | |
| A243 500 60 00 | — | — |
Read by machine from the document NHTSA serves (4 pages), read Sep 30, 2026. A part number is shown only where it matches Mercedes-Benz’s own catalogue shape, an operation only with its code and time, and a description only where the reader got it whole; anything it could not settle is left out, and the PDF is the record. Times are the manufacturer’s warranty allowances, not a quote. Listings and prices on eBay Motors are the seller’s.
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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 4 model years this bulletin names have filed 134 complaints with NHTSA since 2015. 15 of them name 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.
My vehicle is a 2024 Mercedes-Benz EQB 300. Despite the nationwide recall (NHTSA 26V073000) for high-voltage battery fire risk, the manufacturer is providing conflicting and dangerous safety information. I was verbally instructed by dealership representatives to park my vehicle outdoors and limit charging to 80% to avoid a fire hazard.
2024 Mercedes-Benz EQB · Engine · filed with NHTSA Mar 15, 2026 · ODI 11724420
I was informed that many cars of my make, and model have been recall they will not take into consideration the fact that it’s a safety concern for me now even though I’ve seat didn’t ask questions in regards to this car I know that this car in particular has had over 12,000 recalls for cars between 2022 and 2024 and I’ve asked the…
2023 Mercedes-Benz EQB · Engine · filed with NHTSA Mar 28, 2026 · ODI 11727710
The contact owns a 2022 Mercedes-Benz EQB 300 4MATIC. The contact stated that while driving approximately 45 MPH, there was an abnormal grinding sound coming from the rear of the vehicle, and the vehicle lost motive power. The contact stated that several unknown warnings illuminated.
2022 Mercedes-Benz EQB · Engine · filed with NHTSA Oct 1, 2025 · ODI 11690713
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 group3 other manufacturer communications filed against the Mercedes-Benz EQB under the same component group (engine), newest first.
| Number | Kind | Dated | NHTSA’s summary |
|---|---|---|---|
| LI22.10-P-079966 | Service bulletin | Oct 29, 2025 | Complaint Noise during load change when driving Cause Tolerances in front left bearing of major assembly carrier (transmission mount) A 243… |
| LI08.10-P-079423 | Service bulletin | Jun 12, 2025 | Complaint Reduced Drive Power' warning displayed on Instrument Cluster, as Illustrated in the Picture, but no relevant fault codes are prese… |
| LI08.20-P-077050 | Service bulletin | Oct 30, 2023 | Diverse fault messages in the instrument cluster The fault code P061AE9 is set if the N129/2 power electronics detects an undervoltage wh… |
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 LI20.30-P-078333 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 LI20.30-P-078333 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 LI20.30-P-078333 cover?
The manufacturer filed it against 4 model years: 2025 Mercedes-Benz EQB, 2024 Mercedes-Benz EQB, 2023 Mercedes-Benz EQB, 2022 Mercedes-Benz EQB. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.