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P code powertrain High severity

P0658 Sensor Reference Voltage ""C"" Circuit Range/Performance Problem

The OBD2 code P0658 indicates a problem with the sensor reference voltage "C" circuit, suggesting that the voltage level is outside the expected range or not performing as intended

Definition

The OBD2 code P0658 indicates a problem with the sensor reference voltage "C" circuit, suggesting that the voltage level is outside the expected range or not performing as intended

Common causes

  • Faulty sensor
  • Damaged wiring or connectors
  • Short circuit in the circuit
  • Open circuit in the circuit
  • Poor ground connection
  • Faulty powertrain control module (PCM)
  • Corroded connectors
  • Intermittent electrical issues

Common misdiagnoses

  • Faulty sensor
  • Wiring issues
  • Bad ground connection
  • Powertrain control module (PCM) failure
  • Incorrectly installed or damaged connectors
  • Short circuit in the wiring harness
  • Open circuit in the wiring harness
  • Intermittent electrical connections
  • Other sensor malfunctions
  • Software issues in the PCM

Troubleshooting steps

  1. 1. Check for Additional Codes

    Use an OBD-II scanner to check for any other trouble codes that may be present. This can provide more context and help identify related issues

  2. 2. Inspect Wiring and Connectors

    Visually inspect the wiring and connectors associated with the sensor reference voltage circuit. Look for signs of damage, corrosion, or loose connections

  3. 3. Pay special attention to the wiring harnesses that lead to the sensors that may be affected

  4. 4. Test the Sensor Reference Voltage

    Use a multimeter to measure the reference voltage at the sensor connector. The expected voltage is typically around 5 volts, but this can vary depending on the vehicle and the specific sensor

  5. 5. If the voltage is significantly lower or absent, there may be an issue with the power supply to the sensor

  6. 6. Check Ground Connections

    Ensure that the ground connections for the sensors are secure and free of corrosion. A poor ground can lead to voltage issues

  7. 7. Inspect the Affected Sensors

    Identify which sensors are connected to the reference voltage "C" circuit. Check these sensors for proper operation and any signs of damage

  8. 8. If a specific sensor is faulty, it may need to be replaced

  9. 9. Test the Powertrain Control Module (PCM)

    If the wiring and sensors appear to be in good condition, the issue may lie within the PCM itself. Check for any updates or recalls related to the PCM

  10. 10. In some cases, reprogramming or replacing the PCM may be necessary

  11. 11. Check for Short Circuits

    Inspect the circuit for any short circuits to ground or to other power sources. This can cause incorrect voltage readings and trigger the P0658 code

  12. 12. Clear the Code and Test Drive

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

  13. 13. Seek Professional Help

    If the issue persists after performing these steps, it may be best to consult a professional mechanic or technician who has experience with OBD-II diagnostics. By following these steps, you should be able to identify and resolve the issue related to the P0658 code