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Jerky Shifting on my 2020 E450 - Especially 2nd to 3rd

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Mike T. · rep 0 · May 25, 3:05 AM · 1 replies · solved · Question

Vehicle: 2020 Mercedes-Benz E450

Hi all,

I'm reaching out because I've started experiencing some really rough and jerky shifts in my 2020 Mercedes-Benz E450. It's most noticeable when shifting from 2nd to 3rd gear, but sometimes also from 3rd to 4th. It feels like a harsh thud or a delayed engagement.

The car has about 45,000 miles on it, and this issue has just started in the last few weeks. There's no Check Engine Light yet, but the driving experience is definitely not what I expect from an E-Class.

Has anyone with a 2020 E450 or similar Mercedes model experienced this? Could it be a transmission fluid issue, or something more serious? Any insights would be helpful.

✓ Accepted solution

ClearTheCode Admin

ClearTheCode Team · rep 0 · May 25, 3:05 AM

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ClearTheCode admin answer:

Jerky or harsh shifting on your 2020 Mercedes-Benz E450, especially between specific gears like 2nd and 3rd, can be concerning. While a Check Engine Light may not be present, it's a clear indication of a potential issue within the transmission or its control system. Mercedes-Benz transmissions are sophisticated, and even minor deviations can impact their smooth operation.

Here are common causes and diagnostic steps:

  1. Transmission Fluid Condition and Level: Old, degraded, or low transmission fluid is a very common cause of shifting problems. Mercedes-Benz transmissions use specific fluid types and have precise level requirements. Over time, fluid can lose its lubricating properties and become contaminated. A fluid flush and filter replacement might be necessary if the fluid is old.
  2. Software Adaptation/Updates: Modern transmissions are electronically controlled and learn your driving style. Sometimes, the transmission control unit (TCU) may require a 're-adaptation' or a software update from the dealer to resolve shifting irregularities.
  3. Valve Body Issues: The valve body is the 'brain' of the automatic transmission, directing fluid pressure to engage different gears. Solenoids within the valve body can stick or fail, leading to delayed or harsh shifts. This is a more complex repair.
  4. Conductor Plate Problems: On some Mercedes models, the conductor plate, which houses speed sensors and solenoids, can fail. While less common on newer models, it's still a possibility.
  5. Mechatronic Unit: This integrated unit combines the valve body and TCU. Issues here can manifest as various shifting problems.

When to see a shop:

Given the complexity of Mercedes-Benz transmissions, it's crucial to have your E450 inspected by a Mercedes-Benz specialist. They can perform a diagnostic scan using factory tools to check for any stored fault codes (even if the CEL isn't on), inspect the transmission fluid, and assess the need for software updates or mechanical repairs. Ignoring transmission issues can lead to more significant and costly damage down the line.

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