OBD-II Trouble Code P0485 indicates a problem with the cooling fan power or ground circuit. This code is typically found in vehicles that have an electric cooling fan.
The electric cooling fan helps to cool the engine coolant when the vehicle is stationary or traveling at low speeds. The fan is controlled by a relay that receives power and ground signals from the engine control module (ECM). When the ECM detects a problem with the power or ground circuit for the cooling fan, it will trigger the P0485 code and turn on the check engine light.
The possible causes of the P0485 code include a faulty cooling fan relay, a malfunctioning cooling fan motor, damaged wiring or connections in the power or ground circuits, a failed ECM, or a blown fuse.
To diagnose and repair the issue causing the P0485 code, a mechanic will typically use a scan tool to read the codes stored in the ECM and perform diagnostic tests on the cooling fan system components. Depending on the cause of the problem, the mechanic may need to replace the cooling fan relay or motor, repair or replace damaged wiring or connections, replace a blown fuse, or replace the ECM.
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