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C code chassis High severity

C0499 Steering Assist Control Solenoid Feed Circuit High

The OBD2 code C0499 indicates a problem with the steering assist control solenoid feed circuit, specifically that the circuit is reading a high voltage or resistance, which may affect the power steering system's...

Definition

The OBD2 code C0499 indicates a problem with the steering assist control solenoid feed circuit, specifically that the circuit is reading a high voltage or resistance, which may affect the power steering system's performance

Common causes

  • Faulty steering assist control solenoid
  • Short circuit in the wiring harness
  • Open circuit in the wiring harness
  • Corroded or damaged connectors
  • Faulty power steering control module
  • Low power steering fluid level
  • Electrical interference or grounding issues
  • Malfunctioning vehicle speed sensor

Common misdiagnoses

  • Power steering pump failure
  • Steering gear or rack issues
  • Electrical wiring problems
  • Faulty steering angle sensor
  • Control module failure
  • Battery or charging system issues
  • Grounding problems
  • Incorrectly diagnosed wheel alignment issues
  • Faulty connectors or terminals
  • Software or calibration issues in the control module

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other related trouble codes. This can provide more context and help identify if there are other issues affecting the steering system

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the steering assist control solenoid. Look for signs of damage, corrosion, loose connections, or frayed wires. Repair or replace any damaged components

  3. 3. Test the Solenoid

    If accessible, test the steering assist control solenoid for proper operation. You can do this by measuring the resistance across the solenoid terminals with a multimeter. Compare the readings to the manufacturer's specifications

  4. 4. Check Power and Ground

    Use a multimeter to check for proper voltage and ground at the solenoid connector. Ensure that the solenoid is receiving the correct voltage as specified in the vehicle's service manual

  5. 5. Inspect the Steering Control Module

    The steering control module may be malfunctioning. Check for any signs of damage or failure. If necessary, test the module according to the manufacturer's specifications

  6. 6. Look for Short Circuits

    Check for any short circuits in the wiring harness that could cause a high voltage reading. This may involve inspecting the wiring for any points of contact with metal surfaces or other wires

  7. 7. Check for Software Updates

    Sometimes, a software update for the vehicle's control modules can resolve issues related to steering assist. Check with the manufacturer or a dealership for any available updates

  8. 8. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner and take the vehicle for a test drive to see if the code returns

  9. 9. Consult a Professional

    If the issue persists after performing these steps, it may be necessary to consult a professional mechanic or technician who has experience with your specific vehicle make and model. Always refer to the vehicle's service manual for specific diagnostic procedures and specifications related to the steering assist system