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byd_mot02
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BYD · Electric & Hybrid Cars
Motor Controller Communication Error
Quick Answer
Error code BYD_MOT02 on your BYD Electric & Hybrid Cars means: Motor Controller Communication Error. 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. CAN bus fault between the motor controller unit and vehicle supervisory module
  2. Motor controller firmware crash requiring a power cycle to restore communication
  3. Wiring harness connector loose or corroded at the motor controller signal interface
  4. 12V power supply instability causing the motor controller to drop from the CAN network
  5. Motor controller hardware failure causing permanent loss of communication capability
How to Fix It
1
Perform a complete vehicle power cycle by turning off the vehicle and waiting 5 minutes
2
Check for available OTA software updates addressing known motor controller firmware issues
3
Inspect the motor controller wiring harness and connector for physical damage or corrosion
4
Verify 12V battery and DC-DC converter are providing stable voltage to the controller
5
Contact BYD service for motor controller module diagnostic testing and replacement
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
Motor controller unit
CAN bus wiring harness repair kit
Motor controller connector assembly
12V diagnostic tool for voltage monitoring
Related Error Codes
BYD_BMS01BYD_BMS02BYD_BMS03BYD_CHG01BYD_CHG02
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