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Home / DTC / C2401 — Electric Parking Brake Actuator Circuit Fault

C2401 — Electric Parking Brake Actuator Circuit Fault

Detailed page for trouble code C2401.

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Code

C2401

Generic C — Chassis

Electric Parking Brake Actuator Circuit Fault

Brand: Generic
Type: C — Chassis
Views: UK: 1 EN: 3 RU: 2
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring between EPB actuator and control module
  • Corroded, loose or damaged connector at the actuator
  • Blown fuse or faulty relay supplying EPB circuit
  • Faulty electric parking brake actuator (motor, internal electronics, or position sensor)
  • Low battery or poor battery/charging system voltage under load
  • Loss of CAN or module communication affecting actuator commands

Symptoms

  • EPB warning light or message on instrument cluster
  • Parking brake fails to engage or release
  • Audible motor noise with no movement or no motor noise at all
  • Inability to perform auto-hold or park interlock functions
  • Diagnostic trouble codes stored and possible limp or restricted functionality

What to check

  • Confirm ignition ON and battery voltage healthy (measure at battery terminals)
  • Read and record stored DTC(s) and freeze frame data with a capable scan tool
  • Visually inspect wiring, connectors and EPB actuator for damage, corrosion or water ingress
  • Check relevant fuses and relays for continuity and correct operation
  • Attempt actuator command using scan tool (actuator ON/OFF/self-test) and observe behavior

Signal parameters

  • Supply voltage at actuator connector: ~11–14.5 V with ignition ON (greater than ~10.5 V during operation)
  • Ground continuity: near 0 Ω between actuator ground and chassis ground
  • Actuator motor current: varies by design; expect transient current draw when commanded (typically up to several amps) — large sustained current may indicate seizure
  • Actuator coil/driver resistance: refer to vehicle-specific spec; generally low ohms for motor windings and higher for sensors (measure with service data)
  • Control signal: PWM or switched power command from EPB module; verify presence/absence with scope or scan tool
  • CAN or LIN messages: EPB status and commands should appear on network when commanding actuator

Diagnostic algorithm

  1. Safety: Park on level surface, chock wheels and follow manufacturer safety procedures before working on braking system
  2. Read codes: Use scan tool to read C2401 and any related codes; save data and clear then re-scan only after tests
  3. Visual inspection: With key OFF, inspect harness and connectors at each wheel/actuator and ECU for corrosion, damage or pin push-out; repair as needed
  4. Check battery and charging: Measure battery voltage and charging system under load; ensure adequate voltage for actuator operation
  5. Check fuses/relays: Identify and verify continuity/power of EPB fuse(s) and relay(s); replace if faulty
  6. Backprobe actuator connector: With ignition ON and actuator commanded via scan tool, measure supply voltage and ground at connector — confirm proper voltage and that the command signal changes as expected
  7. Resistance/current test: With power removed, measure actuator motor/sensor resistance per service data and perform an applied-current test or use an amp clamp while commanding actuator to check current draw vs expected
  8. Wiggle test: With connector attached, command actuator while gently moving harness and connector to detect intermittent faults
  9. Communication check: Verify CAN/LIN messages and module presence with scan tool; check wiring and termination if network errors present
  10. Isolate circuit: If wiring suspicious, perform continuity and short-to-power/ground tests between actuator connector and control module pins; repair wiring as indicated
  11. Actuator bench test or replacement: If wiring and power/ground/commands are good and actuator behaves incorrectly, replace or service actuator per manufacturer procedure
  12. Confirm repair: Clear codes, perform actuator and EPB system relearn/self-test via scan tool, verify normal operation and road test if required

Likely causes

  • Damaged/loose connector at the EPB actuator
  • Open or short in the harness to the actuator
  • Faulty EPB actuator motor or internal driver electronics
  • Blown fuse or faulty power relay supplying the EPB circuit

Fault status

⚠️ Status
Stored DTC C2401 — Electric Parking Brake Actuator Circuit Fault. EPB system may be inoperative or limited; inspect actuator circuit, connectors, power/ground and module communications.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

C2400 C2402 C2403 C2410 U0121 U0100
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Code

C2401

HYUNDAI C — Chassis

Motor - Abnormal | Motor Circuit | Motor Position Sensor Error | Motor circuit

Brand: HYUNDAI
Type: C — Chassis
Views: UK: 17 EN: 20 RU: 12
AI status
Completed
ready
Completed 100%
Page language: EN

Causes

  • Open or shorted wiring between EPB actuator and control module
  • Corroded, loose or damaged connector at the actuator
  • Blown fuse or faulty relay supplying EPB circuit
  • Faulty electric parking brake actuator (motor, internal electronics, or position sensor)
  • Low battery or poor battery/charging system voltage under load
  • Loss of CAN or module communication affecting actuator commands

Symptoms

  • EPB warning light or message on instrument cluster
  • Parking brake fails to engage or release
  • Audible motor noise with no movement or no motor noise at all
  • Inability to perform auto-hold or park interlock functions
  • Diagnostic trouble codes stored and possible limp or restricted functionality

What to check

  • Confirm ignition ON and battery voltage healthy (measure at battery terminals)
  • Read and record stored DTC(s) and freeze frame data with a capable scan tool
  • Visually inspect wiring, connectors and EPB actuator for damage, corrosion or water ingress
  • Check relevant fuses and relays for continuity and correct operation
  • Attempt actuator command using scan tool (actuator ON/OFF/self-test) and observe behavior

Signal parameters

  • Supply voltage at actuator connector: ~11–14.5 V with ignition ON (greater than ~10.5 V during operation)
  • Ground continuity: near 0 Ω between actuator ground and chassis ground
  • Actuator motor current: varies by design; expect transient current draw when commanded (typically up to several amps) — large sustained current may indicate seizure
  • Actuator coil/driver resistance: refer to vehicle-specific spec; generally low ohms for motor windings and higher for sensors (measure with service data)
  • Control signal: PWM or switched power command from EPB module; verify presence/absence with scope or scan tool
  • CAN or LIN messages: EPB status and commands should appear on network when commanding actuator

Diagnostic algorithm

  1. Safety: Park on level surface, chock wheels and follow manufacturer safety procedures before working on braking system
  2. Read codes: Use scan tool to read C2401 and any related codes; save data and clear then re-scan only after tests
  3. Visual inspection: With key OFF, inspect harness and connectors at each wheel/actuator and ECU for corrosion, damage or pin push-out; repair as needed
  4. Check battery and charging: Measure battery voltage and charging system under load; ensure adequate voltage for actuator operation
  5. Check fuses/relays: Identify and verify continuity/power of EPB fuse(s) and relay(s); replace if faulty
  6. Backprobe actuator connector: With ignition ON and actuator commanded via scan tool, measure supply voltage and ground at connector — confirm proper voltage and that the command signal changes as expected
  7. Resistance/current test: With power removed, measure actuator motor/sensor resistance per service data and perform an applied-current test or use an amp clamp while commanding actuator to check current draw vs expected
  8. Wiggle test: With connector attached, command actuator while gently moving harness and connector to detect intermittent faults
  9. Communication check: Verify CAN/LIN messages and module presence with scan tool; check wiring and termination if network errors present
  10. Isolate circuit: If wiring suspicious, perform continuity and short-to-power/ground tests between actuator connector and control module pins; repair wiring as indicated
  11. Actuator bench test or replacement: If wiring and power/ground/commands are good and actuator behaves incorrectly, replace or service actuator per manufacturer procedure
  12. Confirm repair: Clear codes, perform actuator and EPB system relearn/self-test via scan tool, verify normal operation and road test if required

Likely causes

  • Damaged/loose connector at the EPB actuator
  • Open or short in the harness to the actuator
  • Faulty EPB actuator motor or internal driver electronics
  • Blown fuse or faulty power relay supplying the EPB circuit

Fault status

⚠️ Status
Stored DTC C2401 — Electric Parking Brake Actuator Circuit Fault. EPB system may be inoperative or limited; inspect actuator circuit, connectors, power/ground and module communications.
🟡 Repair difficulty: Medium
⏱️ Diagnostic time: 1.0 - 3.0 hours

Similar codes

C2400 C2402 C2403 C2410 U0121 U0100
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