P0483 OBD II Trouble Code Cooling Fan Rationality Check Malfunction

Symptoms of P0483 OBD II Trouble Code

  • Malfunction Indicator Light On
  • Engine Overheating
  • A/C system not functioning properly

Common Causes of P0483 OBD II Trouble Code

  • Open in the power supply circuit between the cooling fan module and the PCM ? possible
  • Short to ground in the power supply circuit to the cooling fan module - possible
  • Cooling system malfunction ? faulty thermostat/water pump ? most likely
  • Cooling fan module faulty - possible
  • Faulty PCM - highly unlikely

Severity of P0483 OBD II Trouble Code

Severity depends upon the failure. If a mechanical failure; severe. If an electrical failure, it may not be as severe, as the PCM can compensate for it, as long as the engine does not overheat. While the PCM is compensating, the temperature gauge must be monitored during all drive cycles. Typically, the fans operate all the time (100 % duty cycle).