P0494 - OBD Trouble Code

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The P0494 trouble code would be stored in when the powertrain control module would detect a voltage reading which is too low from the electric cooling fan control circuit. This trouble code is generic, which would mean that it can apply to all the vehicles which are equipped with the OBD-II or the vehicles which are made since 1996 up to the present. The specifications on the definition, the troubleshooting steps as well as repairs can always vary from one vehicle make to another.

The P0494 error code can be defined as Fan Speed Low.

Willing to learn something more about the P0494 fault code? This code is related to the engine cooling and air conditioning systems. The powertrain control module gathers data from the circuitry in the cooling fan control system in order to ensure that the engine temperature remains at the correct level and at the same time the air conditioner is working correctly.

What causes this problem with the Fan Speed Low?

• Flaws in the cooling fan control unit
• There can be loose or corroded electrical connectors
• Some quirks in the cooling fan clutch
• Defaults in the engine coolant temperature sensor
• The electrical wiring might be opened or shorted

1. Engine Coolant Temperature Sensor - OBD Code P0494 can appear because of faulty Engine Coolant Temperature Sensor.
2. Electronic Control Unit - There can be some issues with the Electronic Control Unit due to which you may see P0494 code appearing over and over again. Visit us to buy best quality Electronic Control Unit online.
3. Powertrain Control Module - Are you facing some faults in your Powertrain Control Module? Don’t worry and get them replaced or else P0494 code can turn up.
4. Engine Control Module - Engine Coolant Temperature Sensor is perfectly fine but still but having that trouble code P0494 flashing? In such a situation your Engine Control Module might be faulty. Why don’t you think of getting that replaced?
5. Air Intake Temperature Sensor - The P0494 code can also arise due to some issues in Air Intake Temperature Sensor. So it is advised to replace them as soon as possible.

It is essential to know the symptoms of an issue as only then you would be able to solve the problem. So that’s why we have listed out some major symptoms of OBD Code P0494 here:

Common Symptoms

• Engine might start overheating
• There can be some noises coming from the car engine
• Decrease in the engine performance
• Issue of engine misfiring
• The car engine can start stalling
• Bad fuel mileage

If you wish to correct this fault code, then you have to follow certain steps. Correcting a problem needs your careful attention. Here are some ways with the help of which you will be able to correct the OBD Code P0494:

• Replace a bad cooling fan motor
• Make sure to replace the defective cooling fan control unit
• Replace a faulty engine coolant temperature sensor
• You can always repair any open or shorted electrical wiring
• If there are some issues in the cooling fan relay, then it should be repaired or restored
• Some loose or corroded electrical connectors should be repaired
• Replace a faulty cooling fan clutch

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If you want to easily diagnose this trouble code, then you must follow the steps which are mentioned here as below:

• After verifying the code with an OBD-II scanner, the mechanic should begin with a visual inspection of all wiring and other electrical components, as well as vacuum lines and hoses
• If there are any electrical issues, such as loose or shorted elements, should be repaired properly
• Now once this is done, then it is important to clear the code and retest the system. If the code returns, then the mechanic must continue by checking the voltage of the primary cooling fan motor.
• Then the next step would be to check the voltage readings of the engine cooling fan relay. If either of these parts are not meeting the manufacturer’s specifications, then it is very important to replace them
• The mechanic should continue in this manner, diagnosing and retesting the system after each possible diagnosis, until the real cause is found

Common Mistakes When Diagnosing The P0494 Code

• The most common mistake when diagnosing and repairing this code is to replace a cooling fan motor without performing a thorough diagnostic procedure of the entire system
• We can understand this better with an example like cooling fan relays are frequently recalled, and may therefore be the true issue. It is important to diagnose all possible problems before replacing any major parts