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
Meaning | P0495: 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.
Action | Description | Tools Needed |
---|---|---|
Check for Other Codes | Use 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 Fan | Visually 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 Speed | Use 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 Circuit | Check 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 Supply | Measure 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 Drive | After 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 Codes | After 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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Hi, I am Juraj “Yuri” Lukacko. I got frustrated by unhelpful and scammy mechanics, so I decided to learn everything about car diagnostics myself. I test dozens of new car diagnostic tools every month along with learning new strategies to fix and customize cars. About Juraj Lukacko (Yuri)