Code
C2605
HYUNDAI
C — Chassis
Actuator Soft Control Error
Views:
UK: 14
EN: 25
RU: 16
AI status
Completed
Completed
100%
Causes
- Faulty actuator (internal electronics or motor)
- Intermittent or open/short wiring between control module and actuator
- Poor connector contacts (corrosion, bent pins, water intrusion)
- Insufficient power supply or poor ground to actuator
- Faulty control module software or module internal fault
- CAN or serial communication errors between modules
Symptoms
- ABS/ESC/VSM or other related warning lamp illuminated
- Loss or reduction of the subsystem controlled by the actuator (braking, steering assist, HVAC flap, etc.)
- Diagnostic trouble codes stored for actuator and/or communications
- Intermittent or permanent degraded performance of associated system
- Clicking, grinding, or no movement from actuator when commanded
What to check
- Read freeze frame and full DTC list from all modules with a capable scan tool
- Check for related communication codes (U0xxx/U1xxx) and subsystem codes
- Visually inspect actuator connector and wiring harness for damage, corrosion, or water
- Measure battery voltage at the actuator connector with ignition ON
- Verify good ground continuity between actuator ground and vehicle chassis
- Attempt active test/actuation with scan tool and observe response
Signal parameters
- Battery supply voltage at actuator (typically 12–14 V with ignition ON)
- Ground continuity and voltage drop under load
- CAN bus voltage levels and error counters (if applicable)
- Actuator command signal (PWM duty cycle or logic command) from controller
- Actuator feedback values (position sensor, hall sensor counts, current draw)
- Motor current or resistance (stall vs. running values)
Diagnostic algorithm
- Connect a factory-capable scan tool, read and record all codes and freeze frame data from related modules.
- Clear the code, perform a key cycle, and attempt to reproduce the fault while monitoring live data (actuator commands and feedback).
- Perform a visual inspection of the actuator and wiring harness; repair any damaged insulation, connectors, or terminals.
- With ignition ON, measure voltage at actuator power pin and measure ground; confirm nominal battery voltage and low voltage drop at ground.
- Use the scan tool to command the actuator. If actuator does not respond, probe the command signal (PWM or logic) at the connector to confirm the controller is sending the command.
- Measure actuator motor current or resistance. High current or zero movement suggests mechanical bind or motor fault. Open/short indicates wiring or internal fault.
- Check CAN/communication lines for proper termination, voltage levels, and errors if actuator uses network communication.
- If wiring and controller commands are correct but actuator fails, remove and bench-test or replace the actuator per service manual procedures.
- After repair or replacement, clear codes, perform any required relearn/calibration or module programming, then road test to confirm the fault is resolved.
- If fault persists after actuator replacement, inspect and test the controlling module and CAN bus for intermittent faults and consider module reprogramming or replacement.
Likely causes
- Corroded or loose connector at the actuator (common)
- Open/short in actuator power or ground circuit
- Actuator internal electronic failure (motor driver or sensor)
- Communication loss on CAN/serial bus or module fault
- Mechanical seizure preventing normal movement
Fault status
Status
Actuator failed soft (software) control: controller command did not result in expected actuator response or feedback.
Repair difficulty: Medium
Diagnostic time: 1.0-3.0 hours
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