P0480 Code: Cooling Fan Control Circuit — Causes & Fix
P0480 means a fault in the cooling fan control circuit (fan 1) — the ECM/relay that switches the radiator fan.
- Applies to
- All OBD-II vehicles (any make or model)
- Est. repair cost
- $30 – $500
- Time to fix
- 30 minutes – 2 hours
What it means
Causes include a failed fan relay, wiring/connector faults, or a failed cooling fan. P0480 is a generic OBD-II powertrain code defined in the SAE J2012 standard, so it applies to virtually any 1996-or-newer petrol car or light truck regardless of make. Fix the underlying fault, then clear the code with an OBD-II scan tool — it will return if the problem isn't resolved.
Symptoms
- Check engine light on
- Fan not running; overheating in traffic
- High temperature gauge at low speed
How to fix it
- 1
Test the fan relay and wiring
1. Check the fan relay operation and connector. 2. Confirm power and ground to the fan.
- 2
Replace the relay/fan
1. Replace a failed relay or fan, then clear the code. 2. Verify the fan cycles when hot.
Frequently asked questions
Is P0480 why my car overheats in traffic?
It can be — if the fan control fails, the engine loses low-speed cooling. Test the relay and wiring first.
Last updated July 19, 2026
Guidance only — always consult a qualified professional or the official service manual before carrying out repairs.