What is the reason for the Qin Plus DM-i EV being restricted?

[IsabelleLee]

Qin Plus DM-i EV being restricted refers to a situation where other components on the engine experience functional failure or restricted functionality, prompting the driver to perform timely maintenance. This issue frequently occurs with components such as the generator and compressor. When the vehicle displays an EV function restriction warning, it is essential to immediately take it to a repair shop or 4S dealership for professional servicing. Solution: Restart the vehicle to see if the issue can be resolved. If the problem persists, it indicates that the issue is beyond the capability of an average car owner to fix. To troubleshoot the EV function restriction, it is necessary to connect an OBD scanner to read the fault codes and data stream, identify the exact problem, and then address it accordingly. Precautions regarding EV restriction: It is not advisable to attempt troubleshooting the issue on your own, as BYD's high-voltage electrical system operates at over 700V, posing significant risks. It is likely that BYD manufacturers share this concern, which is why they have implemented a high-voltage interlock protection mechanism.

[MartinRose]

The power limitation issue in Qin Plus DM-i EV is a common challenge, often due to dynamic protection requirements. Frequent rapid acceleration and deceleration during driving can cause the power control unit to overheat, triggering current limitation. Battery health degradation, such as capacity fading after exceeding 500 cycles, may conservatively activate system restrictions. Strong external power interference from unstable charger output or electromagnetic interference can mislead the system. Owner misuse like simultaneously running high-power AC and flooring the accelerator creates instantaneous overload, limiting EV mode to prevent system crash. My practice is preheating the battery for minutes before driving and using low-consumption settings during peak loads. Maintenance advice suggests using OEM parts for minor components, as aging wiring harnesses and relays are frequent culprits. Long-term, optimizing driving habits and maintenance schedules can significantly reduce limitation occurrences.