HomeBrandsBYDElectric & Hybrid Carsbyd_bms02
B
byd_bms02
Moderate
BYD · Electric & Hybrid Cars
Battery Temperature Differential High
Quick Answer
Error code BYD_BMS02 on your BYD Electric & Hybrid Cars means: Battery Temperature Differential High. This is usually fixable — see the step-by-step guide below.
Affected Models
Applies to all models
BYD-A3BYD-DPBYD-HNBYD-SLBYD-SUBYD-SPBYD-TG
Likely Causes
  1. Coolant flow restriction in battery thermal management channels causing uneven cooling
  2. Coolant pump underperformance or failure resulting in inadequate thermal circulation
  3. Blocked or kinked coolant hose preventing flow to a specific zone of the battery pack
  4. Faulty battery temperature sensor providing incorrect readings that mask actual thermal gradients
  5. Sustained high-power charging or discharging in a single zone overloading local thermal management
How to Fix It
1
Reduce charging rate or driving intensity to lower heat generation within the battery pack
2
Allow the vehicle to cool in ambient air for 30 minutes with thermal management system active
3
Check battery coolant reservoir level and inspect coolant hoses for blockages or damage
4
Review temperature readings across battery zones via the vehicle service interface
5
Schedule BYD service for coolant pump inspection or thermal management system repair
Pro Tip
This fix requires some technical knowledge. If you're unsure about any step, consider contacting support or a qualified technician.
Parts You May Need
Battery thermal management coolant (BYD-specified)
Coolant pump assembly
Coolant hose and fitting kit
Battery zone temperature sensor
Related Error Codes
BYD_BMS01BYD_BMS03BYD_CHG01BYD_CHG02BYD_CHG03
Video Guides
Loading video guides…
Search more on YouTube →