Fix P0495: STEP-BY-STEP diagnostic GUIDE!

The P0495: Fan Speed High code indicates that the engine cooling fan is running at a higher speed than expected. This can be caused by a faulty fan, issues in the fan control circuit, or an excessive voltage supply to the fan. A fan that operates too fast can lead to improper cooling system operation and may affect the overall performance of the vehicle.

P0495 – Quick Overview

MeaningP0495: Fan Speed High
Is it serious?Yes, a fan running at excessive speeds can cause overcooling, affecting engine efficiency and potentially leading to other performance issues.
Possible causes– Faulty fan
– Faulty fan control circuit
– High voltage supply
How to diagnose?– Test the fan for high speed issues
– Inspect the fan control circuit
– Verify voltage supply to the fan

P0495 Meaning

The P0495: Fan Speed High code means that the cooling fan is running too fast, which could be due to a malfunctioning fan, problems with the control circuit, or an excessively high voltage supply. A fan running at high speed when it is not needed can cause overcooling of the engine, resulting in inefficient fuel usage and potentially impacting engine performance.

Step-by-step diagnostic guide

Follow the outlined procedure to diagnose this DTC by eliminating possible causes one by one.

ActionDescriptionTools Needed
Check for Other CodesUse an OBD-II scanner to check if there are any other related codes present. These might provide further clues about the issue.OBD-II Scanner
Inspect the Cooling FanVisually inspect the fan for any signs of damage or issues that could cause it to run at high speeds. Ensure there are no blockages or obstructions around the fan.Flashlight, Safety Gloves
Test the Fan for High SpeedUse a diagnostic tool to monitor the fan’s speed and compare it with the manufacturer’s specifications. Determine if the fan is running faster than required.Diagnostic Tool, Manufacturer’s Specifications
Inspect the Fan Control CircuitCheck the wiring and connectors of the fan control circuit for any signs of damage, corrosion, or loose connections that could cause the fan to run at high speeds.Flashlight, Multimeter
Verify Voltage SupplyMeasure the voltage supply to the fan to ensure it is not receiving an excessive voltage, which can cause the fan to run too fast.Multimeter
Clear the Code and Test DriveAfter completing the necessary repairs, clear the P0495 code using the OBD-II scanner. Take the vehicle for a test drive to ensure the issue is resolved and the code does not return.OBD-II Scanner, Vehicle Owner’s Manual
Recheck for CodesAfter the test drive, re-scan the vehicle to ensure the P0495 code has not reappeared. If the code returns, further diagnosis may be required.OBD-II Scanner
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