P0480

Symptoms

• Check Engine Light Is On
• Engine overheating (especially in traffic jams and under high load)
• The fan does not turn on when the engine heats up
• The fan runs constantly even when the engine is cold
• The air conditioner cools worse than usual
• Increase in coolant temperature on the gauge

Causes

• Faulty fan relay
• Blown fan circuit fuse
• Open or short circuit in fan wiring
• Faulty fan motor
• Faulty fan control module (on vehicles without a separate relay)
• ECU malfunction (rare)
• Oxidized connectors in the control circuit

How to Fix

1. Check the fan circuit fuses (according to the specific car diagram)
2. Check the fan relay: replace it with a similar serviceable one from the fuse box
3. Measure the supply voltage at the fan connector when the ECU commands to turn on
4. Check fan grounding
5. Check the fan motor: apply power directly from the battery - it should rotate
6. Check the integrity of the wiring from the computer to the relay and from the relay to the fan
7. Activate the fan through the scanner and observe the reaction
8. Replace the faulty element (relay, motor or wiring harness)

Related codes

Error P0480 by Vehicle Brand