What does the BYD Song EV restriction mean?
3 Answers
BYD Song EV restriction means that the high-voltage electrical part of the vehicle cannot function properly. EV restriction implies: This does not mean the entire high-voltage system is damaged, but rather that a certain component has an issue, activating the high-voltage interlock program of the system. It's somewhat similar to older Volkswagen vehicles, where if just one small part fails, the entire car won't start. Causes of EV function restriction: There are many possible causes, such as issues with the air conditioning, cooling water pump, high-voltage electrical box, transmission, power battery, or blown fuses. In short, it's not a common problem, but these faults will activate the high-voltage interlock protection mechanism. Simple solution: Try restarting the vehicle to see if the issue resolves. If not, it indicates the problem is beyond what an ordinary owner can fix. To troubleshoot the EV function restriction, you need to connect an OBD scanner to read the fault codes and data stream, identify the exact issue, and then address it accordingly.
I once encountered a situation where my BYD Song EV displayed a 'power limited' warning, and I was particularly worried that the car might be broken. Later, I asked a friend who knows about electric vehicles, and he explained that 'power limited' means the vehicle system automatically restricts power output, which is common when there are potential issues with the battery or motor. It could be due to the battery temperature being too high or too low, and the car reduces power for safety reasons to avoid damaging more critical components. For example, in summer traffic jams, the battery can easily overheat, and the system will intervene to limit acceleration capability. When I see this warning light while driving, my first reaction is to slow down, pull over, turn off the engine, and wait a few minutes before restarting—often, the issue disappears. If it occurs frequently, it's time to visit a 4S shop for a comprehensive check. They will use a diagnostic tool to check the BMS (Battery Management System) for any error codes. In short, this function is actually a protective mechanism, reminding us not to force the car to drive and to address the issue early for safety benefits and to extend battery life.
I've been driving electric vehicles for many years, and power limitation is a common minor issue in the BYD Song EV. Essentially, it's the vehicle's self-protection response. For example, when the system detects unstable battery voltage, abnormal charging, or motor overheating, it will proactively reduce output power to prevent chain reactions. There are various reasons, such as rapid capacity decline due to battery aging or insufficient charging in low-temperature environments. From my experience, don't panic when this happens. First, pull over and check if there are any other warnings on the dashboard, then try gently restarting the power a few times. Many minor issues, like software bugs, can be resolved after a restart. However, if the battery warning light also comes on, you should immediately head to a professional repair shop to avoid bigger problems. In daily driving, avoid sudden acceleration and prolonged high-speed driving at full charge to reduce the likelihood of power limitation.
