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C1700 Left Rear Sensor Circuit Failure

The OBD2 code C1700 indicates a malfunction in the left rear wheel speed sensor circuit, which may affect the vehicle's anti-lock braking system (ABS) and traction control

Definition

The OBD2 code C1700 indicates a malfunction in the left rear wheel speed sensor circuit, which may affect the vehicle's anti-lock braking system (ABS) and traction control

Common causes

  • Faulty left rear wheel speed sensor
  • Damaged wiring or connectors in the sensor circuit
  • Corrosion at the sensor connector
  • Poor ground connection
  • Malfunctioning ABS control module
  • Issues with the vehicle's electronic control unit (ECU)
  • Wheel bearing problems affecting sensor operation
  • Incorrect installation or alignment of the sensor

Common misdiagnoses

  • Faulty wheel speed sensor
  • Damaged wiring or connectors
  • ABS control module failure
  • Incorrectly calibrated ABS system
  • Brake system issues
  • Faulty ECM/PCM
  • Tire size discrepancies
  • Wheel bearing problems

Troubleshooting steps

  1. 1. Visual Inspection

    Check Wiring and Connectors: Inspect the wiring harness and connectors leading to the left rear wheel speed sensor for any signs of damage, corrosion, or loose connections

  2. 2. Sensor Condition

    Examine the sensor itself for physical damage or debris that may be obstructing it

  3. 3. Check Sensor Resistance

    Multimeter Test: Use a multimeter to measure the resistance of the left rear wheel speed sensor. Compare the readings to the manufacturer's specifications. A significantly out-of-spec reading may indicate a faulty sensor

  4. 4. Check Voltage Supply

    Power and Ground: With the ignition on (engine off), check for proper voltage at the sensor connector. Ensure that the sensor is receiving the correct voltage and that the ground connection is solid

  5. 5. Test the Sensor

    Sensor Output: While the vehicle is in motion, use a scan tool to monitor the wheel speed sensor's output. The readings should change as the wheel turns. If the sensor does not produce a signal, it may be faulty

  6. 6. Check for Short Circuits

    Wiring Inspection: Look for any short circuits in the wiring harness that could cause the sensor to fail. This includes checking for pinched wires or wires that may be touching the chassis

  7. 7. Scan for Additional Codes

    Check for Related Codes: Use an OBD-II scanner to check for any additional trouble codes that may provide more context or indicate related issues

  8. 8. Clear Codes and Test Drive

    Reset the System: After performing repairs or replacements, clear the trouble codes and take the vehicle for a test drive to see if the code reappears

  9. 9. Replace the Sensor

    If Necessary: If all tests indicate that the sensor is faulty, replace the left rear wheel speed sensor with a new one

  10. 10. Check the ABS Module

    Module Issues: If the problem persists after replacing the sensor, there may be an issue with the ABS control module. This may require professional diagnosis

  11. 11. Consult Repair Manual

    Manufacturer Specifications: Refer to the vehicle's service manual for specific diagnostic procedures, wiring diagrams, and specifications related to the left rear wheel speed sensor.Conclusion Following these troubleshooting steps should help you identify and resolve the issue related to the C1700 code. If you're not comfortable performing these checks or if the problem persists, it may be best to consult a professional mechanic for further diagnosis and repair