What causes the “Transmission Malfunction” warning and total loss of power in my E-Class during highway driving in Pakistan?

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What causes the “Transmission Malfunction” warning and total loss of power in my E-Class during highway driving in Pakistan?

Some E-Class drivers in Pakistan report sudden “Transmission Malfunction – Visit Workshop” warnings and total loss of drive power while cruising on highways like the M2 o r M9. The engine keeps running, but the transmission becomes unresponsive. Could this be caused by electrical faults, overheating, failed mechatronics, o r internal gearbox damage? Is this linked to overheating due to long-distance driving in high temperatures?

Talha Kyanii asked on 11 Oct 2025 13:01:30 pm

1 Answer

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Gari Master - on 11 Oct 2025 13:02:19 pm

The sudden “Transmission Malfunction – Visit Workshop” warning accompanied by total loss of drive on highways is usually caused by:

Overheating of the transmission o r TCU: Long high-speed drives in Pakistan’s hot climate strain cooling systems.

Electrical faults: Wiring harness issues, corroded connectors, o r sensor failures trigger safety shutdowns.

Mechatronics failure: Internal control unit faults can cause limp mode o r shutdown.

Hydraulic failures: Blocked valve bodies o r fluid contamination can also cause sudden failure.

Preventive steps:

Ensure transmission fluid levels and quality are regularly checked.

Use a transmission cooler for frequent highway driving o r towing.

Have electrical connectors cleaned and inspected during service.

Perform diagnostics before and after highway trips to catch early faults.