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byd_reg01
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BYD · Electric & Hybrid Cars
Regenerative Braking Limited
Quick Answer
Error code BYD_REG01 on your BYD Electric & Hybrid Cars means: Regenerative Braking Limited. 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. High-voltage battery at high state of charge unable to safely accept regenerative energy input
  2. Motor or motor controller thermal limit reducing available regen current
  3. Cold battery temperature lowering the rate at which cells can safely accept charging current
  4. BMS protective mode restricting regen due to detected cell imbalance or degradation
  5. Brake system fault causing fallback to a lower regenerative braking setting
How to Fix It
1
Reduce battery state of charge below 85 percent to restore full regenerative braking capacity
2
Pre-condition the battery in cold weather using the climate pre-conditioning feature before driving
3
Allow motor and controller to cool after an intensive performance driving session
4
Check for brake system fault codes via the vehicle diagnostics menu
5
Contact BYD service if regenerative braking remains reduced under normal operating temperatures and charge levels
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
Diagnostic interface for BMS and brake system data access
Battery thermal management coolant if cooling-related cause is identified
Related Error Codes
BYD_BMS01BYD_BMS02BYD_BMS03BYD_CHG01BYD_CHG02
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