Code
C2401
Generic
C — Chassis
Electric Parking Brake Actuator Circuit Fault
AI status
Completed
Completed
100%
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
- Safety: Park on level surface, chock wheels and follow manufacturer safety procedures before working on braking system
- Read codes: Use scan tool to read C2401 and any related codes; save data and clear then re-scan only after tests
- 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
- Check battery and charging: Measure battery voltage and charging system under load; ensure adequate voltage for actuator operation
- Check fuses/relays: Identify and verify continuity/power of EPB fuse(s) and relay(s); replace if faulty
- 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
- 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
- Wiggle test: With connector attached, command actuator while gently moving harness and connector to detect intermittent faults
- Communication check: Verify CAN/LIN messages and module presence with scan tool; check wiring and termination if network errors present
- Isolate circuit: If wiring suspicious, perform continuity and short-to-power/ground tests between actuator connector and control module pins; repair wiring as indicated
- Actuator bench test or replacement: If wiring and power/ground/commands are good and actuator behaves incorrectly, replace or service actuator per manufacturer procedure
- 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
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Code
C2401
HYUNDAI
C — Chassis
Motor - Abnormal | Motor Circuit | Motor Position Sensor Error | Motor circuit
AI status
Completed
Completed
100%
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
- Safety: Park on level surface, chock wheels and follow manufacturer safety procedures before working on braking system
- Read codes: Use scan tool to read C2401 and any related codes; save data and clear then re-scan only after tests
- 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
- Check battery and charging: Measure battery voltage and charging system under load; ensure adequate voltage for actuator operation
- Check fuses/relays: Identify and verify continuity/power of EPB fuse(s) and relay(s); replace if faulty
- 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
- 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
- Wiggle test: With connector attached, command actuator while gently moving harness and connector to detect intermittent faults
- Communication check: Verify CAN/LIN messages and module presence with scan tool; check wiring and termination if network errors present
- Isolate circuit: If wiring suspicious, perform continuity and short-to-power/ground tests between actuator connector and control module pins; repair wiring as indicated
- Actuator bench test or replacement: If wiring and power/ground/commands are good and actuator behaves incorrectly, replace or service actuator per manufacturer procedure
- 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
Repair manuals
Manual library for HYUNDAI
371
Browse 371 HYUNDAI manuals: repair procedures, diagnostics, wiring diagrams, component locations, service data and Labor Times by year, model and trim.
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