P0482 Cooling Fan 3 Control Circuit Malfunction

P0482 indicates a malfunction in Cooling Fan 3 control circuit. The third fan control path is not behaving as expected when commanded or monitored.

Code details

Generic OBD-II · P0

System: Emissions
Code type: Generic (SAE / ISO controlled)
Standard: SAE J2012 / ISO 15031-6

Diagnostic boundary

A diagnostic trouble code reports that a monitored test failed. It does not prove one specific part is bad, and manufacturer logic can add vehicle-specific conditions.

Do not assume all cooling fans share one fault; isolate the fan 3 control circuit and load.

Symptoms of P0482

Check-engine light, often with no obvious change in how the car drives.
A failed emissions test or incomplete readiness monitors.
Sometimes a faint fuel-vapour smell (on EVAP codes).

Common causes of P0482

A worn catalytic converter or an oxygen/air-fuel sensor reading out of range.
EVAP leaks — a loose or failed gas cap, cracked hose, or purge/vent valve.
Exhaust leaks, fuel-trim problems, or a fault in a related monitor.

Useful checks before replacing parts

Review fan 3 command, relay or fan module output, fuse feed, current draw, coolant temperature, A/C pressure, and related fan codes.
Inspect fan 3 wiring, relay contacts, control module connectors, grounds, damaged terminals, fan motor load, and harness heat damage.
Command fan 3 separately and confirm the electrical command produces the expected fan speed or operation.

Related OBD-II codes

These nearby emissions entries can help compare wording and pin down the fault area.