What is the reason for the BYD SVS light being on and the car not moving when shifting gears?
3 Answers
BYD SVS light being on and the car not moving when shifting gears indicates that the engine control unit has detected an error signal from a certain sensor or that it has exceeded the usage standard. When the ignition switch is turned on, the car's SVS indicator light will illuminate for an automatic check and will automatically turn off after a few seconds, which is a normal phenomenon; if it remains on, it indicates a fault in the car's electronic control system. The following is an introduction to the car's electronic control system: 1. Electronic Control Unit (ECU): The core of the control system, it is a microcomputer containing integrated circuits and other precise electronic components. 2. Sensors: Car sensors are placed in different locations of the car, and their main function is to provide the car control system with various operational condition information, such as engine speed, throttle opening, coolant temperature, etc. 3. Actuators: Devices that perform corresponding actions based on the electrical signals output by the electronic control unit.
I've been driving for decades and have seen many issues like this with BYD vehicles. The SVS light usually indicates a fault in the vehicle system, and the inability to move when shifting gears is an even more dangerous sign. The most common causes could be transmission problems, such as damaged clutches or torque converters; or errors in the electronic control unit, like faulty sensors such as speed sensors or throttle position sensors, causing the vehicle to refuse to move. Last time, my neighbor's car had the same issue, and it turned out to be a stuck brake switch affecting signal transmission. Remember to try turning the engine off and restarting—sometimes this can temporarily resolve electronic faults. But safety comes first; pull over immediately and don't force the car to drive, as this could damage the transmission. It's best to use an OBD scanner to read the fault codes or tow it directly to a 4S shop for professional inspection. Regular maintenance checks on transmission fluid and the brake system can help reduce the occurrence of such issues.
Guys, this issue is quite common in BYD vehicles. The SVS light coming on indicates a service reminder, and combined with the gear not engaging, several factors need to be considered. For the transmission part, components like the valve body or shifter might be stuck; on the electronic side, faulty sensors such as the speed or position modules could send incorrect signals; if the car is an electric or hybrid version, the battery control unit might also give false alarms. I suggest you first check if the brake lights are on—a faulty switch can cause this. Use an inexpensive OBD tool to plug in and read the codes, which can pinpoint the exact issue. Don’t try to dismantle it yourself; head to a repair shop and let the mechanics diagnose it quickly with their computer. During regular oil changes, take a look at the drivetrain as a preventive measure.
