Mercedes-Benz bulletin LI20.10-P-076206
What it saysComplaint Customer states that the CEL is lit in the instrument cluster. NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a service bulletin dated Oct 13, 2025, received May 3, 2024, about the engine — 14 documents under this number. It names 21 model years (2019–2024). 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 Customer states that the CEL is lit in the instrument cluster. Various codes may be active/stored: Stored in N3/10 in model series 206, 254 or 232: P012800 - The coolant temperature is below the coolant thermostat specified temperature. and/or P01169D - Malfunction in coolant temperature sensor 1. Under temperature in the component or system. For model series 177, 118, 247 in n3/10 (only valid for M139.980 facelift (code 9U8)): P2CEF00 - Electrical fault or open circuit in coolant thermostat. and/or P011685 - Malfunction in coolant temperature sensor 1. There is a signal above the permissible limit. Cause Debris in the coolant system Remedy An updated thermostat must be installed. Order the correct thermostat part number for your application: CLA45/GLA45 with SA Code 9U8: A 139 200 66 02 CLA45/GLA45 WITHOUT SA Code 9U8: A 139 200 27 02 All other M139 equipped vehicles: A 139 200 64 02 New screws must also be ordered and used when installing thermostat A 139 200 66 02 or A 139 200 64 02 PN N000000006341 (qty 2) will be used in place of the existing M8 screws. on the face of the thermostat. The new screws must be torqued to 8 Nm. Follow the instructions in WIS for removal and installation with the exception of the thermostat screw torque value mentioned previously. After replacement, fill and bleed the coolant system per the instructions in WIS for the model that is being worked on. QC the car on a test drive. If the complaint is remedied, release the vehicle.
Documents filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| LI20.10-P-076206 | Service bulletin | Oct 13, 2025 | 11024266 | PDF, 40 KB |
| LI20.10-P-076206 | Service bulletin | Aug 25, 2025 | 11022194 | PDF, 37 KB |
| LI20.10-P-076206 | Service bulletin | Jul 8, 2025 | 11020640 | PDF, 37 KB |
| LI20.10-P-076206 | Service bulletin | Jun 4, 2025 | 11019601 | PDF, 37 KB |
| LI20.10-P-076206 | Service bulletin | May 9, 2025 | 11018232 | PDF, 37 KB |
| LI20.10-P-076206 | Service bulletin | May 6, 2025 | 11018165 | PDF, 37 KB |
| LI20.10-P-076206 | Service bulletin | May 2, 2025 | 11018038 | PDF, 37 KB |
| LI20.10-P-076206 | Service bulletin | May 1, 2025 | 11017687 | PDF, 6,899 KB |
| LI20.10-P-076206 | Service bulletin | Jan 27, 2025 | 11013331 | PDF, 7,530 KB |
| LI20.10-P-076206 | Service bulletin | Jan 9, 2025 | 11012807 | PDF, 7,530 KB |
| LI20.10-P-076206 | Service bulletin | Jul 26, 2024 | 11005286 | PDF, 7,530 KB |
| LI20.10-P-076206 | Service bulletin | Jun 21, 2024 | 11003096 | PDF, 6,903 KB |
| LI20.10-P-076206 | Service bulletin | May 25, 2024 | 11000622 | PDF, 6,905 KB |
| LI20.10-P-076206 | Service bulletin | Apr 23, 2024 | 10253772 | PDF, 6,900 KB |
What the document itself lists
Parts the bulletin names
| Part number | Description | Qty | Find it |
|---|---|---|---|
| A 139 200 66 02 | CLA45/GLA45 with SA Code 9U | — | eBay Motors → |
| A 139 200 27 02 | CLA45/GLA45 WITHOUT SA Code 9U | — | eBay Motors → |
| A 139 200 64 02 | All other M139 equipped vehicles | — | eBay Motors → |
Read by machine from the document NHTSA serves (3 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 themAlso filed against model years this site has no page for: 2024 Mercedes-Benz AMG C63 S E.
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 20 model years this bulletin names have filed 343 complaints with NHTSA since 2015. 74 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.
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
Engine was failed prior to purchase, it is available for inspection. Engine jerks while driving. Dealer changed engine and problem got worse. Vehicle was inspected at Mercedes Benz Manhattan. Engine light keeps coming on and engine oil raises above normal level and warning light comes on and dealer says its normal
2020 Mercedes-Benz CLA-Class · Engine · filed with NHTSA Sep 16, 2024
Driving a 2024 mercedes c300 on the florida turnpike in the left lane at 70 MPH the engine suddenly slowed down. While the vehicle slowed in heavy traffic I was able to merge to the outside lane where it stopped. I called mercedes emergency who suggested waiting a while and try starting the vehicle .
2024 Mercedes-Benz C-Class · Engine · filed with NHTSA Jul 19, 2026
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 group57 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… |
| NCU - 2026010004 | Service campaign | Jul 27, 2026 | • Always use the latest XENTRY Diagnosis software release with all available add-ons. • Make sure to follow the operation steps exactly as d… |
| 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… |
| Emissions - 2024100016 | Emissions | Jul 24, 2026 | Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz, has determined that on certain MY 2019-2021 C-Class, G-Class, GLC, GT, S-Class… |
| 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… |
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 LI20.10-P-076206 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 LI20.10-P-076206 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.
Which vehicles does LI20.10-P-076206 cover?
The manufacturer filed it against 21 model years: 2024 Mercedes-Benz C-Class, 2023 Mercedes-Benz C-Class, 2022 Mercedes-Benz C-Class, 2021 Mercedes-Benz C-Class, 2020 Mercedes-Benz C-Class, 2024 Mercedes-Benz CLA-Class and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.