P0483 - ENGINE COOLANT BLOWER MOTOR, RATIONALITY CHECK MALFUNCTION

The cooling fan module is located at the back of the radiator, just in front of the engine. It is controlled by the Powertrain Control Module (PCM) through the inputs connected to it.

These inputs determine the temperature of the coolant, engine and intake air, the air conditioning pressure, as well as the speed of the car. When the DTC code P0483 OBDII is set, it is because the inputs do not match the normal operating voltages that are stored in the computer memory. It is also set if the operation of the cooling fan does not match the default information in the PCM.

• Check Engine light on.
• Engine reheating.
• A malfunction of the A/C system.

The factors to set the fault code P0483 OBD2 are

• The power supply between the cooling fan module and the PCM may be short.
• There may be a short to ground on the fan power supply.
• Malfunction of the cooling system due to a bad thermostat or water pump.
• Defective cooling fan module.

To solve the problems related to the diagnostic code P0483 OBDII, you must do the following:

• See the Technical Service Bulletins (TSB).
• Find the cooling fan module and check the cables and connectors. If there are any wires with burn spots or rubbing against other components, make the necessary repairs.
• Make sure the water pump and thermostat are working properly. Also, check that the radiator cap seals properly. If you find damage to any of these components, you should replace them.
• Test the fan and associated circuits. To do this, disconnect the harness that goes to the fan module and connect one wire from the multimeter to one terminal of the fan and the other wire to the remaining terminal. Check the manufacturer's specifications to knows the proper resistance levels. If the reading obtained shows infinite resistance or no resistance at all, you must replace the fan module.
• Check that there are 12 volts in the power circuit. If this voltage is not present, it is due to a short in the wiring, defects in the same, or a defective relay.