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What does it mean when the BYD Song transmission function is restricted?

1 Answers

AylaLynn

07/29/25 7:04am

This is the transmission's protection mode. When the transmission computer detects a transmission fault, it will protect the automatic transmission by locking it in a certain gear to reduce damage. Usually, the fault is caused by the transmission hydraulic control unit, which requires disassembling the transmission hydraulic control unit, i.e., the transmission's computer and valve body. Below is additional information: BYD Song: The dual-clutch transmission in the BYD Song controls the engine speed quite well. In D mode, it shifts up at 2000rpm to achieve the best fuel economy. To save even more fuel, you can switch the transmission to ECO mode, which slightly compromises performance but improves fuel economy.

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