Mazda 6 transmission failure due to corroded cooling lines and fluid leakage, requires replacement on Mazda 6

Submitted by Vehicle Owner · Jun 23, 2025
Published by RepairPal

Problem overview

Some Mazda 6 owners report experiencing transmission failure due to factors such as overheating, which can damage the transmission system. A lack of maintenance, particularly not regularly checking or replacing the transmission fluid, is another common issue that can lead to problems. Additionally, constant stop-and-go driving may place extra strain on the transmission, increasing the risk of failure. Some owners have also reported issues with corroded cooling lines and fluid leakage, which can necessitate transmission replacement as these problems can lead to overheating and low fluid levels essential for lubrication. It is crucial for owners experiencing these issues to address them promptly to prevent further damage and potentially avoid a full transmission replacement. Regular maintenance, including checking for leaks and ensuring proper fluid levels, can significantly help prolong the life of the transmission.

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