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P0483 is a diagnostic trouble code (DTC) for "Cooling Fan Rationality Check Malfunction". This can happen for multiple reasons and a mechanic needs to diagnose the specific cause for this code to be triggered in your situation. Our certified mobile mechanics can come to your home or office to perform the Check Engine Light diagnostic. Once we are able to diagnose the problem, you will be provided with an upfront quote for the recommended fix and receive $20.00 off as a credit towards the repair. All our repairs are backed by our 12-month / 12,000-mile warranty.
The presence of the P0483 code in the PCM indicates that the PCM is detecting a voltage reading that is either too high or too low in the electrical cooling fan control circuit.
The ECM, or Engine Control Module, regulates the electric cooling fan within the engine. This fan is responsible for cooling the engine once it reaches a specific temperature, for providing air conditioning, and will run when a variety of predetermined conditions occur. If the P0483 code is stored, it means that the cooling fan has been commanded to turn on or off, but the voltage reading indicates that the fan did not respond to the command.
In most cases, the P0483 code is present when there is a bad cooling fan motor or faulty fan control relay.
Other causes may include:
If the PCM stores the P0483 code, it is likely that the vehicle would first display certain symptoms that include an illuminated Check Engine Light, on overheating engine, blown fuses, or a malfunctioning air conditioning system.
The first step to diagnosing a detected P0483 code is to perform a visual inspection of the wiring and connectors between the ECM, the cooling fan, and the PCM. If any appear to be loose, corroded, or faulty, repairing or replacing them should be followed by clearing the code and retesting the system. If the P0483 code returns, then the technician should move on to other repair options. It’s important than any power steering leaks or pump failure be fixed before inspecting the coolant fan motor, because the motor is driven by the hydraulic pressure from the power steering pump.
In many later model vehicles, the cooling fan relay has been recalled, or part of a technical service bulletin. However, it’s a common mistake for technicians to simply replace the cooling fan motors, as the mostly likely candidate for the P0483 code, rather than performing a total diagnosis and checking the relays.
The P0483 code indicates a very serious issue within the issue, and should be addressed immediately. If the cooling fan is not activating as it should to cool the engine, it could lead to engine malfunction or failure due to overheating. It can also make it dangerous and uncomfortable to drive in extremely warm weather if the air conditioning does not work properly.
In order to repair the issues that cause the P0483 code, a technician may perform some or all of the following, being sure to clear the code and retest after each possible fix:
YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.