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Home >> Hyundai >> 2021 >> Ioniq Hybrid SEL >> Repair and Diagnosis >> Brakes >> Parking Brake System >> Parking Brake System Diagnosis (HEV) >> DTC C1501-01: EPB Switch-Failure >> DTC Information >> DTC Detecting Condition

DTC Information: DTC Detecting Condition

Item Detecting Condition Possible Cause
DTC Strategy
  • Monitoring the EPB Switch signal
  1. EPB switch circuit open/short circuit
  2. Faulty EPB switch
  3. Driver abnormal switch control (too many activation, pull or push for long time or slowly push/pull switch)
Enable Conditions
  • EPB wake-up (Ignition switch 'ON')
Threshold Value
  • When the operation switch lines is opened for more than 2 seconds
  • When short circuit to Ground is detected in the switch for more than 2 seconds
  • When short circuit to Battery is detected in the switch for more than 2 seconds
  • When the operation switch lines is short to each other during 2 seconds
  • If the switch is in on position longer than 90 seconds while the vehicle speed is below 4 km/h (2.48 mi/h)
Warning Lamp
  • EPB warning lamp 'ON'