Why do I hear a whining noise from the transmission while driving at certain speeds?

Steve Mowat

Steve Mowat

Steve Mowat, Owner of Avantgarde Automotive, began as a BMW apprentice in 1997, then excelled at McLaren and Mercedes-Benz. In 2009, he founded his business.

Understanding the Issue with Transmission Whining Noises

The mysterious whining sound emanating from your transmission while driving at specific speeds can be both perplexing and concerning. This might be something that Mercedes Benz owners of models produced in the last decade, such as the E-Class W212 or the C-Class W205, would recognise.

  • Symptom Identification: Characterised by a high-pitched noise, particularly when accelerating.
  • Possible Consequences: If ignored, the whining noise can lead to serious transmission issues and costly repairs.

Common Causes for Whining Noise in Mercedes Models

  1. Worn Out Bearings: In the GLA-Class X156, a known issue is wear and tear of the input or output bearings.
  2. Transmission Fluid Issues: In the S-Class W222, low or contaminated transmission fluid has been the culprit.
  3. Faulty Torque Converter: Specific to the SL-Class R231, this component may be responsible for the noise.

For further insights, our Mercedes specialist servicing in Bristol offers expert diagnosis.

How to Diagnose and Fix the Problem

Tools and Parts Required

  • Transmission Fluid Pump
  • Set of Wrenches and Screwdrivers
  • Mercedes Part Numbers:
    • Bearings: A2049810125
    • Torque Converter: A2212500702

Step-by-Step Guide

  1. Check Transmission Fluid:
    • Use a fluid pump to extract a sample.
    • Replace if dirty or contaminated (Mercedes Spec: 236.14).
  2. Inspect Bearings and Torque Converter:
    • Remove transmission casing using appropriate wrenches.
    • Inspect bearings and torque converter for wear.
    • Replace as necessary using the part numbers provided.

Examples of Mercedes Models with Specific Issues

  • E-Class W212: Known for bearing wear leading to whining.
  • A-Class W176: Problems with transmission fluid quality.
  • SLR McLaren: Rare, but potential torque converter issues. More information can be found on our SLR McLaren page.

Ready to Silence that Whining? Visit Avantgarde Automotive

If these noises are haunting your drives, don’t let the issue linger. With expert care and attention to detail, your prized Mercedes can return to its whisper-quiet self. Always consult with a professional technician, as the tips provided here are merely guidance and not a definitive solution.

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