C1202 - FAULT CODE - OBD2

POST UPDATED IN January, 2023

C1202 Code failures by brands

C1202 CHEVROLET: LEFT FRONT WHEEL SPEED SENSOR NO SIGNAL.

Description of DTC code C1202

At the start of a vehicle wheel spinning, an AC voltage is produced from the Wheel Speed Sensor. This voltage is sent to the Hydraulic Electronic Control Unit (HECU), which uses it to calculate how fast the wheel is turning. It is important to note that torque greatly reduces the susceptibility to noise, resulting in a DTC being set.

The Chevrolet vehicle manufacturer states that when the C1202 OBDII fault code is set, it is because a malfunction has been found in the Speed Sensor circuit for the left front wheel. The reason for this condition is that the signal that the sensor is expected to send is not present.

Symptoms of fault code C1202

  • Check Engine light illumination.
  • The light indicates the failure of the Anti-lock Brake System (ABS).
  • ABS cannot be used.
  • Power to pump motor and solenoids is cut off.

Causes of OBD2 C1202

The factors for which the DTC C1202 OBD2 code is stored in your Chevrolet vehicle are:

  • The system's electrical circuits could have deficiencies in the wiring or connectors.
  • The electrical connections could have some inconsistencies that result in a short or open circuit.
  • The Left Front Wheel Speed Sensor may be defective.

Possible solutions of the DTC code C1202

To give the respective solution to the C1202 OBDII diagnostic code for your Chevrolet take into account the following:

  • Consult the TSB (Technical Service Bulletins).
  • Verify that there is no damage to the connectors or wires associated with the Left Front Wheel Speed Sensor and the Hydraulic Electronic Control Unit. Correct as required.
  • Using the appropriate tools, it is necessary to check that the electrical values of the Left Front Wheel Speed Sensor are as indicated by the manufacturer, paying special attention to the resistance of the sensor. An out-of-range resistance requires the replacement of the sensor.
  • Check that the Hydraulic Electronic Control Unit circuit is not shorted or open. Follow the manufacturer's recommendations for such tests and make any necessary adjustments.

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