C0300 - FAULT CODE - OBD2

POST UPDATED IN January, 2023

C0300 Code failures by brands

C0300 BUICK, CADILLAC, CHEVROLET, GCM, OLDSMOBILE: REAR PROPSHAFT SPEED SENSOR

Description of DTC code C0300

The rear driveshaft speed sensor is a permanent magnet (PM) generator device. This PM generator produces a pulsating AC voltage. The voltage and the number of pulses tend to rise as the speed increases. The Module converts the pulsating AC voltage into a propeller shaft RPM, which performs various calculations. The RPM of the propeller shaft can be displayed by an automotive scanner.

The Diagnostic code C0300 OBD2 is set when a malfunction is detected in the Rear Drive Shaft Speed Sensor.

Symptoms of fault code C0300

Causes of OBD2 C0300

The C0300 OBDII fault code C0300 is set for the following reasons:

  • The rear driveshaft speed sensor cables may be in poor condition.
  • The rear driveshaft speed sensor circuit connections may be damaged.
  • The rear driveshaft speed sensor may be faulty.

Possible solutions of the DTC code C0300

To troubleshoot DTC C0300 OBD2, follow these suggestions:

  • Consult the TSB (Technical Service Bulletins).
  • Inspect the wiring associated with the Rear Drive Shaft Speed Sensor. Check these for common damage caused by wear or corrosion. Fix if necessary.
  • Perform electronic checks on the Rear Drive Shaft Speed Sensor Compare actual voltages to those specified in the manufacturer's data source. If deficient voltages are detected, make the appropriate repairs.

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