C0300 Rear Propshaft Speed Sensor

Code: C0300

Description: Rear Propshaft Speed Sensor Circuit Malfunction

Definition: This diagnostic trouble code (DTC) indicates a malfunction in the rear propshaft speed sensor circuit. The sensor is responsible for monitoring the rotational speed of the rear propshaft and providing this information to the vehicle’s control module. A fault in this circuit can affect vehicle stability and traction control systems.

C0300 – Rear Propshaft Speed Sensor

Severity: Moderate

Common Causes

C0300 – Rear Propshaft Speed Sensor

Common Causes:

• Faulty rear propshaft speed sensor
• Wiring issues such as damaged wires or poor connections
• Corrosion in the sensor connector
• Issues with the propshaft itself, such as damage or misalignment
• Electronic control module (ECM) software issues

Common Misdiagnosis

OBD2 Code: C0300

Description: Rear Propshaft Speed Sensor Circuit Malfunction

Common Misdiagnosis: Replacing the speed sensor without checking for wiring issues or connector problems.

Common Diagnostic Steps

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OBD2 Code: C0300

Description: Rear Propshaft Speed Sensor Circuit Malfunction

• Check for any stored codes and freeze frame data to understand the conditions under which the code was set.
• Inspect the rear propshaft speed sensor and its wiring for any visible damage or disconnection.
• Test the resistance of the speed sensor using a multimeter to ensure it is within manufacturer specifications.
• Verify that there is proper voltage supply and ground at the sensor connector.
• Examine the reluctor ring on the propshaft for damage or debris that could affect sensor readings.
• If equipped, use an oscilloscope to check for a proper waveform signal from the speed sensor while rotating the propshaft.
• Consult service manual for specific diagnostic procedures related to your vehicle’s make and model if necessary.
• If all tests pass, consider replacing the rear propshaft speed sensor as a last resort after ruling out other potential causes.