Mercedes-Benz bulletin CL - EW M157
What it saysDear Mercedes-Benz Owner: In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA is extending the warranty coverage… NHTSA’s full summary ↓
Mercedes-Benz filed this with NHTSA as a manufacturer communication dated Mar 27, 2026, received Mar 30, 2026, about the engine. It names 26 model years (2016–2019). A manufacturer communication 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 communicationPicked out of NHTSA’s summary below, word for word. The document itself is the record, and the dealer checks the VIN.
Dear Mercedes-Benz Owner: In our continuing efforts to ensure the proper performance of Mercedes-Benz products and to enhance the satisfaction of our customers, Mercedes-Benz USA is extending the warranty coverage on the pressure transducer, vacuum pump, and vacuum lines in your vehicle from the original New Vehicle Limited Warranty of 4 years / 50,000 miles to 15 years/ 150,000 miles (whichever occurs first). This applies to the vehicle regardless of ownership. On certain Model Year 2015 - 2019 CLS, E-Class, G-Class, GLE, GL, GLS, ML, SL and S-Class vehicles with the "M 157" 8-cylinder engine, over time, the pressure transducer and vacuum pump might not continue to work as intended and could result in illumination of the check engine Malfunction Indicator Lamp ('MIL') and the activation of limp-home mode. Any repairs under this warranty extension must be performed by an authorized Mercedes-Benz dealership. •If your preferred authorized Mercedes-Benz dealership performs diagnosis and confirms that your vehicle meets the criteria for this extended warranty, the repair will be covered at no cost to you. •This extended warranty does not apply to any other components or conditions beyond the ones described under this extended warranty, and standard warranty terms apply, including the exclusions with respect to extra expenses, as identified in the Service and Warranty Information booklet.
One of the 357 warranty extensions and special-coverage programs on file — every make, with the term each runs to.
Document filed under this number
| Document | Kind | Dated | NHTSA id | At NHTSA |
|---|---|---|---|---|
| CL - EW M157 | Other | Mar 27, 2026 | 11030303 | PDF, 356 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 26 model years this bulletin names have filed 715 complaints with NHTSA since 2015. 92 of them name Engine, Service Brakes — 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.
Multiple engine ignition coils have failed on this low mileage vehicle. History of failures are as followed. 1/18/2022 Mileage 39,246 Ignition Coil #4 6/16/2022 Mileage 40,915 Ignition Coil #2 3/16/2023 Mileage 43,866 Ignition Coil #6 and #2 4/23/2023 Mileage 44,275 Ignition Coil #1 1/15/2025 Mileage 51,560 Ignition Coil #4 Mercedes Benz…
2016 Mercedes-Benz GLE-Class · Engine · filed with NHTSA Jan 18, 2025
The contact owns a 2019 Mercedes-Benz g550. The contact received notification of NHTSA campaign number: 20v090000 (power train, service brakes, hydraulic, electronic stability control) however, the part for the recall repair was unavailable. The contact stated the manufacturer exceeded a reasonable amount of time for the recall repair.
2019 Mercedes-Benz G-Class · Service Brakes · filed with NHTSA Apr 14, 2020
At first, the parking brake assist would appear when vehicle was put into park or when starting. We would have to release the parking brake each time. Then, the parking brake assist light would not go on, but the parking brake assist would engage and or be sticking while driving causing a burning smell and damage to the rear braking…
2019 Mercedes-Benz GLS-Class · Service Brakes · filed with NHTSA Oct 11, 2023
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 group76 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… |
| LI07.61-P-080241 | Service bulletin | Jun 11, 2026 | Complaint CEL ON with DTC P061197 "the control unit fuel injector has a malfunction output stage fault of control unit is restricted" active… |
| LI07.70-P-080607 | Service bulletin | Jun 3, 2026 | Complaint Check engine light activated. Fault codes related to misfire on multiple cylinders stored. Possible fault codes listed below: P030… |
| NCU - 2026050002 | Service campaign | May 15, 2026 | Mercedes-Benz AG (“MBAG”), the manufacturer of Mercedes-Benz vehicles, has determined that on certain Model Year (“MY”) 2026 G-Class… |
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 CL - EW M157 a recall?
No. A manufacturer communication 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 CL - EW M157 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 CL - EW M157 cover?
The manufacturer filed it against 26 model years: 2018 Mercedes-Benz CLS-Class, 2017 Mercedes-Benz CLS-Class, 2016 Mercedes-Benz CLS-Class, 2019 Mercedes-Benz E-Class, 2018 Mercedes-Benz E-Class, 2016 Mercedes-Benz E-Class and more. Whether one particular vehicle is affected is a matter of its VIN and its build, not its model year alone.