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Home >> Hyundai >> 2021 >> Ioniq Hybrid SEL >> Repair and Diagnosis >> Hybrid/Electric Powertrain >> Testing and Diagnosis >> HCU/Low Dc-Dc Converter Diagnosis (HEV) >> DTC P0504: Brake Switch "A"/"B" Correlation >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • Correlation Check
  1. Poor Connection
  2. Open or Short to battery in signal circuit
  3. Faulty Brake Switch
  4. Faulty Brake Lamp Switch
  5. Faulty Brake Stroke Sensor
  6. Faulty HPCU
Enable Conditions No brake pedal pressed condition
  • IG KEY ON
  • HPCU READY ON
  • HEV READY
  • Aux, Battery Voltage is between 10V and 16V
  • PT Mode = Part Load
  • No CAN Communication Fault
Threshold Value
  • The case that Normal Open signal of brake and Normal Close signal of brake are same has occurred more than 12 times
DTC
  • 2 Driving Cycle
Service Lamp On Condition
  • 2 Driving Cycle