Code p0480 fans only work when the car is turned off?

2006 KIA SEDONA
152,000 MILES • AUTOMATIC
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MOSHNN
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  • 1 POST
I have replaced the fan control module, a coolant temperature sensor. Now I have bridged the relay that hangs behind the front driver side light and the fans only work when the car is turned off. As soon as turn the ignition key the fans slowly stop running. what is my problem
Jul 28, 2026 at 1:42 PM
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STRAILER
  • ✓ASE Certified Mechanic
  • 54,832 POSTS
  • ASE Certified Mechanic
Hello, I can help you, P0480 is Cooling Fan Relay 1 Control Circuit Malfunction. It usually means the PCM doesn't see the expected electrical response when it commands the fan relay. So I would check the grounds first and return the fan relay to the stock wiring. Here is how the system is wired so you can see it avoid confusion, here is how to check the grounds which I have marked for you.


https://www.2carpros.com/articles/how-to-use-a-test-light-circuit-tester/

Check out the images (below). Let me know what you find.

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Jul 29, 2026 at 1:00 AM
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