WOMS
C code chassis Medium severity

C1464 Pressure Transducer Redundant / Secondary Signal Faulted

The OBD2 code C1464 indicates a fault in the pressure transducer's redundant or secondary signal, suggesting that the backup signal is not functioning correctly or is out of range

Definition

The OBD2 code C1464 indicates a fault in the pressure transducer's redundant or secondary signal, suggesting that the backup signal is not functioning correctly or is out of range

Common causes

  • Faulty pressure transducer
  • Wiring issues (shorts, opens, or corrosion)
  • Poor electrical connections
  • Faulty engine control module (ECM)
  • Software issues or calibration errors
  • Vacuum leaks in the system
  • Contaminated or damaged sensor components

Common misdiagnoses

  • Faulty pressure transducer
  • Wiring issues or shorts
  • Faulty engine control module (ECM)
  • Incorrectly calibrated sensors
  • Vacuum leaks
  • Faulty fuel pump
  • Blocked fuel lines
  • Issues with the fuel pressure regulator

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 present

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the pressure transducer. Look for signs of damage, corrosion, or loose connections

  3. 3. Ensure that all connectors are securely attached and free of dirt or moisture

  4. 4. Test the Pressure Transducer

    Use a multimeter to test the resistance and voltage output of the pressure transducer. Compare the readings to the manufacturer's specifications

  5. 5. If the readings are outside the specified range, the transducer may be faulty and require replacement

  6. 6. Check for Ground Issues

    Ensure that the ground connections for the pressure transducer and related components are secure and free of corrosion. A poor ground can lead to signal faults

  7. 7. Inspect the Brake Fluid Level

    Check the brake fluid level in the master cylinder. Low brake fluid can affect the pressure readings and trigger fault codes

  8. 8. Examine the Brake System

    Inspect the entire brake system for leaks, worn components, or other issues that could affect pressure readings

  9. 9. Ensure that the brake lines are not damaged or obstructed

  10. 10. Clear Codes and Test Drive

    After performing the above checks and repairs, clear the trouble codes using the OBD-II scanner

  11. 11. Take the vehicle for a test drive to see if the code reappears. Monitor the brake system's performance during the drive

  12. 12. Consult Technical Service Bulletins (TSBs)

    Check for any TSBs related to the specific make and model of the vehicle. Manufacturers may have issued guidance on common issues related to the C1464 code

  13. 13. Professional Diagnosis

    If the issue persists after performing the above steps, consider seeking assistance from a qualified mechanic or dealership. They may have specialized diagnostic tools and experience with the specific vehicle

  14. 14. Replace the Pressure Transducer

    If all other checks are satisfactory and the transducer is confirmed to be faulty, replace it with a new one. Ensure that the replacement part is compatible with the vehicle. By following these troubleshooting steps, you should be able to identify and resolve the issue related to the C1464 code. Always refer to the vehicle's service manual for specific procedures and specifications