Damaged wiring, chafed loom or corroded connector in the Fan 3 control or power circuit; Faulty Fan 3 motor, for example seized or with worn brushes drawing excess current; Failed fan relay or blown fuse in the Fan 3 circuit; Faulty fan control module or fan speed controller (on models that use one); Poor earth connection or low supply voltage to the fan circuit; Fault inside the engine control unit driver stage.

P0482

Fan 3 Control Circuit.

Generic
Powertrain
Generic code
Medium severity

How this code is built

P: SystemPowertrain
0: Defined bySAE, the same on every car
4: AreaAuxiliary emission controls
82: FaultThe specific fault in that area

What it means

P0482 is the generic SAE J2012 code for a fault in the Fan 3 control circuit. The engine control unit (or the module that controls the cooling fans) commands the third cooling fan on or off and checks the circuit. It set the code because the circuit voltage or feedback did not match the command, which points to an open circuit, a short, or a failed driver or fan control stage. Which fan is 'Fan 3' and how it is wired varies by model and engine.

Symptoms

Engine warning light on
Engine running hotter than normal or temperature gauge climbing in traffic
Cooling fan not running, or running constantly at full speed
Air conditioning performing poorly at idle or in slow traffic
Possible reduced power or limp mode if the engine overheats
Other cooling fan codes stored alongside P0482

Possible causes

Damaged wiring, chafed loom or corroded connector in the Fan 3 control or power circuitlikely
Faulty Fan 3 motor, for example seized or with worn brushes drawing excess currentlikely
Failed fan relay or blown fuse in the Fan 3 circuitlikely
Faulty fan control module or fan speed controller (on models that use one)possible
Poor earth connection or low supply voltage to the fan circuitpossible
Fault inside the engine control unit driver stagerare

How to diagnose

Read all stored codes and freeze frame data, and note any other cooling fan, coolant temperature or battery voltage codes
Check the relevant fuse and relay for Fan 3 against the wiring diagram for that model
Visually inspect the fan wiring, connectors and earth points for chafing, heat damage, water ingress and corrosion
Check the fan blades turn freely by hand with the ignition off and that nothing is obstructing them
Use a scan tool's bi-directional controls to command Fan 3 on and off and see whether it responds
Measure supply voltage, earth and control signal at the fan connector while commanding the fan, following the model's wiring diagram
Check the fan motor current draw and compare it with the manufacturer's specification
Check the control module's power and earth supplies before suspecting the module itself

How to fix

Repair or replace damaged wiring and clean or replace corroded connectors
Replace the Fan 3 motor or fan assembly if it is seized, noisy or drawing excess current
Replace the faulty relay or fuse, and find out why a fuse blew before fitting a new one
Restore poor earth or supply connections
Replace or reprogram the fan control module if testing proves it faulty, as specified by the manufacturer

Can I keep driving?

Medium severity

Short, careful journeys may be possible in cool conditions, but you should watch the temperature gauge closely as overheating can cause serious engine damage. If the temperature rises, stop safely and switch off, and get the fault repaired soon.

Guide written by AI from the code's definition. Confirm with a diagnosis before replacing parts.