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byd_ac001
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BYD · Electric & Hybrid Cars
Heat Pump System Performance Reduced
Quick Answer
Error code BYD_AC001 on your BYD Electric & Hybrid Cars means: Heat Pump System Performance Reduced. 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. Heat pump refrigerant charge low from slow leak reducing system heating and cooling efficiency
  2. Heat pump compressor wear or early failure reducing pressure generation capability
  3. Expansion valve fault causing incorrect refrigerant flow regulation through the circuit
  4. Heat pump system control module receiving incorrect temperature sensor inputs
  5. External heat exchanger blockage from debris reducing heat transfer efficiency
How to Fix It
1
Note whether the reduced performance is more pronounced in heating or cooling mode to narrow the fault
2
Check external heat exchanger fins at the vehicle front for debris, leaves, or mud blockage and clean
3
Review climate system diagnostics in the vehicle settings for specific heat pump sub-fault codes
4
Avoid maximum climate demand in extreme temperatures to reduce stress on the degraded system
5
Schedule BYD service for refrigerant charge inspection and heat pump compressor or valve evaluation
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
Heat pump refrigerant recharge kit
Heat pump compressor assembly
Expansion valve replacement
Heat pump control module
Related Error Codes
BYD_BMS01BYD_BMS02BYD_BMS03BYD_CHG01BYD_CHG02
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