Why is my E-Class showing “Transmission Malfunction” o r going into limp mode in Pakistan’s climate?

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Why is my E-Class showing “Transmission Malfunction” o r going into limp mode in Pakistan’s climate?

E-Class drivers sometimes encounter a “Transmission Malfunction – Visit Workshop” warning, after which the car gets stuck in a single gear usually 2nd o r 3rd. This is known as limp mode. Could this be caused by high temperatures, faulty sensors, o r bad transmission control units TCUs? Is the Pakistani heat o r road condition causing extra stress on the gearbox electronics?

Talha Kyanii asked on 11 Oct 2025 12:54:05 pm

1 Answer

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Gari Master - on 11 Oct 2025 12:55:14 pm

When your E-Class shows a “Transmission Malfunction – Visit Workshop” warning and gets stuck in a low gear, its entering limp mode to protect the gearbox. This is often caused by:

Faulty conductor plate o r speed sensors inside the transmission.

Overheating of the TCU Transmission Control Unit due to poor ventilation o r extreme heat common in Pakistani summers.

Oil contamination in the wiring harness, especially in older models.

Low transmission fluid level o r leaking seals.

Contributing Factors in Pakistan:

Extreme temperatures hot engine bay + poor airflow.

Bumpy roads, which stress transmission mounts and connectors.

Untrained mechanics using local scanners that don’t detect Mercedes-specific codes.

Solution:

Scan with Mercedes STAR Diagnostic tool to check for TCU o r conductor plate errors.

Check for transmission oil leaks o r wiring harness contamination.

If TCU is damaged, replacement o r reprogramming may be needed.

Keep the transmission cool: avoid excessive stop-and-go driving in hot weather, and consider using a transmission cooler if frequently driving in mountainous o r hot areas.