What causes the EV function restriction in BYD Qin Plus DM-i EV?
2 Answers
There are multiple potential reasons for EV function restriction issues, which could include battery failure, motor failure, controller failure, etc. When the vehicle experiences EV function restriction, it should be immediately taken to a repair shop or 4S dealership for professional servicing to avoid unnecessary troubles during usage. Below are detailed explanations of possible causes: High-voltage system malfunction: This may manifest as inability to drive, air conditioning failure, inability to charge the vehicle, and other fault symptoms. Common fault causes: High-voltage battery pack failure; high-voltage system control circuit faults (including self-locking and interlock circuit related failures); energy control module related failures, etc.
Recently, my BYD Qin PLUS DM-i also displayed an 'EV restricted' warning, which really worried me. Simply put, the vehicle's high-voltage system activated its protection mechanism, possibly due to excessive battery temperature or inconsistent charge levels among individual battery cells. Occasionally, the motor controller might also malfunction and report errors, causing the system to cut off the pure electric mode and forcibly switch to hybrid mode. Last time this happened after charging, the technician said it was because the battery management system wasn't calibrated after fast charging. Now, when I encounter this issue, I first find a safe place to restart the vehicle, and most of the time it recovers. If that doesn't work, I immediately contact the 4S店 to check the battery pack and high-voltage wiring harness. They use specialized computers to read fault codes, which is much more reliable than trying to figure it out on our own.
