P0483 Code: What to Do During Cooling Fan Rationality Check Malfunction?


The car’s cooling system is the crucial component that takes the heat away from the system. The heat generated gets stored in the radiator, and the cooling fan responsibly throws the heat away from the system. Unfortunately, the cooling fan isn’t immune to issues and produces a current which is either too high or low. These current variations in technical terms are known as “Cooling Fan Rationality Check” with a P0483 code on the dashboard. This means that the cooling fan isn’t working the way it must and needs to be inspected. Leaving the issues would damage the engine, and Cooling Fan Rationality Check Malfunction is the only way to resolve this problem.

How To Diagnose Cooling Fan Problems?


A P0483 code is accompanied by an illuminated check engine light. The engine begins to overheat, blown fuses, or a malfunctioning AC system are the common suspected in case of such issues.

What Will Happen If you Ignore P0483 Error?

Ignoring the P0483 issue can lead to bigger issues. In case the cooling fan doesn’t work the way, it should lead to engine malfunction due to overheating. Driving is perilous in warm weather, and arriving at the destination becomes a hassle for many.

How to Resolve P0483 Check Engine Error?

Once you have determined the underlying symptoms of  Cooling Fan Rationality Check Malfunction, a cooling fan replacement would resolve the issue in no time. The replacement process is very simple and is carried out by performing the steps mentioned below:

  • Conduct a voltage and ground test on the cooling fan motor.
  • If the test system fuses, replace the ones which are blown.
  • Inspect the relays and circuitry within the system and repair or replace them as per the issue.
  • Check the engine readings and match them with the manufacturer’s manual. It’s time for a coolant sensor replacement if the readings aren’t alike.
  • Have a look at the wiring connected to the PCM and get them replaced if necessary.
  • Check the monitor’s voltage via hands and match them with manufacturers’ specifications. If numbers are alike, perform a fan motor replacement else, replace rheostat or resistor assembly.

What is the Cost of Fixing Cooling Fan Rationality Check Malfunction Issue?

The cooling fan replacement cost depends on the model of the car you own. The mechanic would diagnose the check engine light for $114.99, and labor charges would be levied separately. You can save money by purchasing the part from a trusted store near you, ‘The Auto Parts Shop‘, and watching DIY videos before performing the cooling fan replacement. If you are unable to do it by yourself, take it to the mechanic and get rid of the issue in no time.

Common Mistakes to Avoid Before Fixing P0483 Code

Getting a complete cooling motor replacement is not advised until all the relays have been checked and complete diagnoses have been performed on the car. If the condition of the fan has become worse, a complete cooling fan replacement is recommended in such a case.

The Bottom Line

Don’t ignore the P0483 Code flashing on the ECM of your car every now and then. Determine the Cooling fan replacement price from the trusted store once proper diagnosis and relays have been thoroughly checked.

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