# Service bulletin LI35.31\-P\-080353

A bulletin is a manufacturer's communication to its dealers, as NHTSA indexes it. The summary is NHTSA's. The document is the manufacturer's: read it at NHTSA. A bulletin is not a recall, and listing a model year does not mean every vehicle of it is concerned.

- Type: Service bulletin
- NHTSA id: 11037834
- Published by NHTSA: 2026\-10\-02
- Manufacturer's number: LI35.31\-P\-080353
- Manufacturer's date: 2026\-09\-14
- NHTSA component: POWER TRAIN

## NHTSA's summary

Complaint Whining / humming noises \(described as foghorn‑like\) from the drivetrain in the rear axle area during cornering. \(figure 1\) On the above‑mentioned vehicles with a mileage up to 15,000 km \(about 9,300 mi\), noises can occur from the rear axle differential. Cause Drivetrain resonance caused by the gear mesh of the ring and pinion in the rear axle differential in combination with installed damper elements on the axle shafts. Remedy For precise noise analysis and localization, use the chassis ear/NVH kit and the following driving procedure: 1. Drive the vehicle in a tight circle with the steering at full lock in both clockwise and counter clockwise directions. ‑ Vary engine load during the maneuvers If a foghorn‑like noise occurs comparable to the reference video, the vehicle exhibits the condition If the noise is present: 1. Add 15 ml of additive \(Friction Modifier\) into the rear axle differential via the filler plug IMPORTANT NOTE: Do NOT use Friction Modifier in vehicles equipped with an electronically controlled locking differential \(Code 467\). 2. Tighten the filler plug 3. Drive the vehicle until the rear axle differential reaches operating temperature Note: Proper activation of the additive requires elevated oil temperatures After the test drive to operating temperature, evaluate the noise when the rear axle is cold and when warm. If the noise is no longer present: The issue is resolved and the vehicle can be released. If there is noticeable improvement: The vehicle can be released with the explanation that the noise will gradually disappear over an extended driving distance. If the noise is still present and remains unchanged: Replace the rear axle differential.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037834-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2026/MC-11037834-9999.pdf)

The document is the manufacturer's. This site does not hold it.

## Components

Transmission and driveline

## Vehicles listed

- 2027 MERCEDES BENZ AMG GLC 53 4MATIC\+
- 2027 MERCEDES BENZ AMG GLC 53 4MATIC\+ COUPE
- 2025 to 2026 MERCEDES BENZ AMG GLE53 4MATIC
- 2026 MERCEDES BENZ AMG GLE53 4MATIC\+
- 2026 MERCEDES BENZ AMG GLE53 4MATIC\+ COUPE
- 2026 MERCEDES BENZ AMG GLE63 S 4MATIC
- 2025 to 2026 MERCEDES BENZ AMG GLE63 S 4MATIC\+
- 2026 MERCEDES BENZ AMG GLE63 S 4MATIC\+ COUPE
- 2026 MERCEDES BENZ AMG GLS63 4MATIC
- 2026 MERCEDES BENZ AMG GLS63 4MATIC\+
- 2026 MERCEDES BENZ AMG GLS63 4MATIC\+ COUPE
- 2025 to 2026 MERCEDES BENZ GLE 350
- 2026 MERCEDES BENZ GLE 450E 4MATIC
- 2026 MERCEDES BENZ GLE 580 4MATIC
- 2026 MERCEDES BENZ GLS 450 4MATIC
- 2026 MERCEDES BENZ GLS 580 4MATIC
- 2023 to 2024 MERCEDES\-BENZ AMG C43
- 2023 to 2026 MERCEDES\-BENZ AMG C43 4MATIC
- 2024 MERCEDES\-BENZ AMG C63 S E
- 2024 to 2025 MERCEDES\-BENZ AMG C63 S E 4MATIC\+
- 2026 MERCEDES\-BENZ AMG C63 S E PERFORMANCE 4MATIC\+
- 2024 MERCEDES\-BENZ AMG CLE53
- 2026 to 2027 MERCEDES\-BENZ AMG CLE53 4MATIC CABRIOLET
- 2026 to 2027 MERCEDES\-BENZ AMG CLE53 4MATIC COUPE
- 2024 to 2025 MERCEDES\-BENZ AMG CLE53 4MATIC\+
- 2025 MERCEDES\-BENZ AMG CLE53 4MATIC\+ CABRIOLET
- 2025 MERCEDES\-BENZ AMG E 53 E 4MATIC\+
- 2027 MERCEDES\-BENZ AMG E53E 4MATIC
- 2027 MERCEDES\-BENZ AMG E53E 4MATIC WAGON
- 2024 to 2026 MERCEDES\-BENZ AMG GLC43
- 2024 to 2026 MERCEDES\-BENZ AMG GLC43 4MATIC
- 2024 to 2025 MERCEDES\-BENZ AMG GLC43 4MATIC COUPE
- 2026 MERCEDES\-BENZ AMG GLC43 COUPE
- 2025 MERCEDES\-BENZ AMG GLC63 S E
- 2025 to 2026 MERCEDES\-BENZ AMG GLC63 S E 4MATIC\+
- 2025 to 2026 MERCEDES\-BENZ AMG GLC63 S E 4MATIC\+ COUPE
- 2021 to 2022 MERCEDES\-BENZ AMG GLE53
- 2023 MERCEDES\-BENZ AMG GLE53 4MATIC
- 2023 to 2025 MERCEDES\-BENZ AMG GLE53 4MATIC\+
- 2023 to 2025 MERCEDES\-BENZ AMG GLE53 4MATIC\+ COUPE
- 2021 to 2022 MERCEDES\-BENZ AMG GLE53 COUPE
- 2021 to 2022 MERCEDES\-BENZ AMG GLE63 S
- 2023 to 2024 MERCEDES\-BENZ AMG GLE63 S 4MATIC\+
- 2023 to 2025 MERCEDES\-BENZ AMG GLE63 S 4MATIC\+ COUPE
- 2021 to 2022 MERCEDES\-BENZ AMG GLE63 S COUPE
- 2020 to 2022 MERCEDES\-BENZ AMG GLS63
- 2026 MERCEDES\-BENZ AMG GLS63
- 2024 to 2025 MERCEDES\-BENZ AMG GLS63 4MATIC
- 2023 to 2025 MERCEDES\-BENZ AMG GLS63 4MATIC\+
- 2024 to 2026 MERCEDES\-BENZ AMG S 63 E 4MATIC\+
- 2022 to 2027 MERCEDES\-BENZ C 300
- 2022 to 2027 MERCEDES\-BENZ C 300 4MATIC
- 2024 MERCEDES\-BENZ CLE 300
- 2024 to 2025 MERCEDES\-BENZ CLE 300 4MATIC
- 2024 to 2027 MERCEDES\-BENZ CLE 300 4MATIC CABRIOLET
- 2026 to 2027 MERCEDES\-BENZ CLE 300 4MATIC COUPE
- 2024 MERCEDES\-BENZ CLE 450
- 2024 to 2025 MERCEDES\-BENZ CLE 450 4MATIC
- 2024 to 2027 MERCEDES\-BENZ CLE 450 4MATIC CABRIOLET
- 2026 to 2027 MERCEDES\-BENZ CLE 450 4MATIC COUPE
- 2024 to 2027 MERCEDES\-BENZ E 350
- 2024 to 2027 MERCEDES\-BENZ E 350 4MATIC
- 2024 MERCEDES\-BENZ E 450
- 2024 to 2027 MERCEDES\-BENZ E 450 4MATIC
- 2024 to 2027 MERCEDES\-BENZ E 450 4MATIC ALL\-TERRAIN
- 2025 MERCEDES\-BENZ E53 E 4MATIC\+
- 2026 MERCEDES\-BENZ E53 E 4MATIC\+ ALL\-TERRAIN
- 2023 to 2027 MERCEDES\-BENZ GLC 300
- 2023 to 2027 MERCEDES\-BENZ GLC 300 4MATIC
- 2024 to 2027 MERCEDES\-BENZ GLC 300 4MATIC COUPE
- 2024 MERCEDES\-BENZ GLC 300 COUPE
- 2025 to 2027 MERCEDES\-BENZ GLC 350 E 4MATIC
- 2026 MERCEDES\-BENZ GLC43 4MATIC COUPE
- 2020 to 2024 MERCEDES\-BENZ GLE 350
- 2021 to 2027 MERCEDES\-BENZ GLE 350 4MATIC
- 2021 to 2022 MERCEDES\-BENZ GLE 350 4MATIC COUPE
- 2020 to 2024 MERCEDES\-BENZ GLE 450
- 2021 to 2026 MERCEDES\-BENZ GLE 450 4MATIC
- 2021 to 2022 MERCEDES\-BENZ GLE 450 4MATIC COUPE
- 2025 to 2026 MERCEDES\-BENZ GLE 450 4MATIC COUPE
- 2024 to 2025 MERCEDES\-BENZ GLE 450E 4MATIC
- 2020 to 2021 MERCEDES\-BENZ GLE 580
- 2021 to 2025 MERCEDES\-BENZ GLE 580 4MATIC
- 2021 to 2022 MERCEDES\-BENZ GLE 580 4MATIC COUPE
- 2020 MERCEDES\-BENZ GLS 450
- 2022 to 2025 MERCEDES\-BENZ GLS 450 4MATIC
- 2020 MERCEDES\-BENZ GLS 580 4MATIC
- 2022 to 2025 MERCEDES\-BENZ GLS 580 4MATIC
- 2023 MERCEDES\-BENZ GLS 600
- 2021 MERCEDES\-BENZ GLS450
- 2021 MERCEDES\-BENZ GLS580
- 2021 MERCEDES\-BENZ S 500
- 2023 MERCEDES\-BENZ S 500
- 2022 to 2027 MERCEDES\-BENZ S 500 4MATIC
- 2021 MERCEDES\-BENZ S 580
- 2023 MERCEDES\-BENZ S 580
- 2022 to 2027 MERCEDES\-BENZ S 580 4MATIC
- 2023 MERCEDES\-BENZ S 580 E
- 2023 to 2026 MERCEDES\-BENZ S 580 E 4MATIC
- 2021 MERCEDES\-MAYBACH GLS 600
- 2022 to 2026 MERCEDES\-MAYBACH GLS 600 4MATIC
- 2021 MERCEDES\-MAYBACH S 580
- 2022 to 2026 MERCEDES\-MAYBACH S 580 4MATIC
- 2023 to 2024 MERCEDES\-MAYBACH S 680
- 2022 to 2027 MERCEDES\-MAYBACH S 680 4MATIC

JSON: [/v1/bulletins/11037834](/v1/bulletins/11037834)

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