P0485 OBD II Trouble Code Cooling Fan Power/Ground Circuit Malfunction

Symptoms of P0485 OBD II Trouble Code

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

Common Causes of P0485 OBD II Trouble Code

  • Open / short to power on the fan control circuit between the cooling fan module and the PCM ? possible
  • Short to ground on the fan control circuit to the cooling fan module - possible
  • Cooling fan module faulty - most likely
  • Faulty PCM - least unlikely

Severity of P0485 OBD II Trouble Code

Severity depends upon the failure. With an electrical failure, it may not be considered as severe, as the PCM can compensate for it, unless the engine begins to 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).