# Service bulletin LI33.20\-P\-078406

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: 11021108
- Published by NHTSA: 2025\-07\-31
- Manufacturer's number: LI33.20\-P\-078406
- Manufacturer's date: 2025\-07\-25
- NHTSA component: SUSPENSION

## NHTSA's summary

Complaint Creaking noise, in irregular sequence when driving slowly in combination with slight steering movements and/or Creaking/crackling noises from the area of the wheel bearing on the front axle when cornering/ maneuvering. Sound file attached for comparison. MUST match noise for proper diagnosis. NOTE: Steering functionality is not affected. Cause Contact area between wheel bearing and steering knuckle. See also: LI35.30\-P\-058566 \(Axle Half Shaft noise when changing direction \- Front\) LI33.30\-P\-056665 \(Axle Half Shaft noise when changing direction \- Rear\) LI40.10\-P\-059248 \(Wheel cracking noise when cornering\) Remedy 1. Perform Operation A and evaluate by testing vehicle. 2. If noise is still present, perform Operation A again. 3. If noise is still present after re\-testing, perform Operation B. Operation A: 1. Clean contact surfaces of wheel bearing and steering knuckle with brake cleaner \(see areas marked blue in pictures "2.jpg" and "3.jpg"\). NOTE: The front area of the wheel bearing and the seals must not come into contact with the cleaner, otherwise, the sealing rings will be damaged. 2. Clean threads of wheel bearing mounting. 3. Thinly coat contact surfaces of wheel bearing, steering knuckle, and axle mating face with Molykote \(annular joint grease\) \(see areas marked blue in pictures "2.jpg" and "3.jpg"\). NOTE: Axle mating face greasing is also covered in LI35.30\-P\-058566 and LI33.30\-P\-056665. Operation B \(Only applies to 192 and 232 in listed FIN range above\): 1. Replace steering knuckle. 2. Wheel bearings do not need to be replaced.

## The document

- [NHTSA's copy of the document (PDF)](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021108-0001.pdf)
- [If that address does not open, try this one](https://static.nhtsa.gov/odi/tsbs/2025/MC-11021108-9999.pdf)

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

## Components

Suspension

## Vehicles listed

- 2023 to 2024 MERCEDES\-BENZ AMG C43
- 2024 MERCEDES\-BENZ AMG C63 S E
- 2019 to 2023 MERCEDES\-BENZ AMG E53
- 2023 to 2024 MERCEDES\-BENZ AMG EQE
- 2024 to 2025 MERCEDES\-BENZ AMG EQE SUV 4MATIC
- 2022 to 2024 MERCEDES\-BENZ AMG EQS
- 2016 to 2024 MERCEDES\-BENZ AMG GLC43
- 2018 to 2021 MERCEDES\-BENZ AMG GLC63
- 2020 to 2022 MERCEDES\-BENZ AMG GLC63 S
- 2025 MERCEDES\-BENZ AMG GLC63 S E
- 2018 to 2019 MERCEDES\-BENZ AMG GLC63S
- 2024 to 2025 MERCEDES\-BENZ AMG S 63 E 4MATIC\+
- 2022 to 2025 MERCEDES\-BENZ C 300
- 2025 MERCEDES\-BENZ E 350
- 2025 MERCEDES\-BENZ E 350 4MATIC
- 2018 MERCEDES\-BENZ E 400
- 2019 to 2023 MERCEDES\-BENZ E 450
- 2025 MERCEDES\-BENZ E 450 4MATIC
- 2025 MERCEDES\-BENZ E 450 4MATIC ALL\-TERRAIN
- 2023 to 2025 MERCEDES\-BENZ EQE 350 4MATIC
- 2023 to 2024 MERCEDES\-BENZ EQE 350\+
- 2023 to 2024 MERCEDES\-BENZ EQE 500 4MATIC
- 2023 to 2025 MERCEDES\-BENZ EQE SUV 350 4MATIC
- 2023 to 2025 MERCEDES\-BENZ EQE SUV 350\+
- 2023 to 2025 MERCEDES\-BENZ EQE SUV 500 4MATIC
- 2023 to 2024 MERCEDES\-BENZ EQS 450 4MATIC
- 2022 to 2024 MERCEDES\-BENZ EQS 450\+
- 2022 to 2023 MERCEDES\-BENZ EQS 580 4MATIC
- 2023 to 2025 MERCEDES\-BENZ EQS SUV 450 4MATIC
- 2023 to 2025 MERCEDES\-BENZ EQS SUV 450\+
- 2023 to 2025 MERCEDES\-BENZ EQS SUV 580 4MATIC
- 2018 to 2025 MERCEDES\-BENZ GLC 300
- 2023 to 2025 MERCEDES\-BENZ GLC 300 4MATIC
- 2016 to 2017 MERCEDES\-BENZ GLC300
- 2023 MERCEDES\-BENZ S 500 4MATIC
- 2023 MERCEDES\-BENZ S 580 4MATIC
- 2023 MERCEDES\-BENZ S 580 E 4MATIC
- 2025 MERCEDES\-BENZ S 580 E 4MATIC
- 2024 to 2025 MERCEDES\-MAYBACH EQS SUV 680 4MATIC
- 2023 MERCEDES\-MAYBACH S 680 4MATIC

JSON: [/v1/bulletins/11021108](/v1/bulletins/11021108)

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