High Voltage Battery Fault
CriticalBYD · Battery & Charging
What does this warning light mean?
This light comes on briefly when you first start the vehicle. If the high voltage battery system is working properly, it will turn off after a few seconds. If a fault develops in the system, the light will illuminate again.
Can I drive?
Stop driving immediately
What to do
Contact a BYD authorised service centre as soon as possible to have your vehicle inspected. A fault is indicated if the light stays on while the vehicle is in READY mode, or if it illuminates (continuously or intermittently) while driving.
Likely causes
- —BMS internal fault
- —Cell voltage imbalance
- —High voltage isolation fault
- —Wiring harness issue
Technical Information
| Field | Value |
|---|---|
| Code | BYD_WL_009 |
| System | Battery & Charging |
| Severity | CRITICAL |
| Can drive? | no |
Data confidence: Community This information is for reference only. Always consult a qualified technician for diagnosis and repair. Do not attempt high-voltage system repairs yourself.