What Does P0482 Mean?
The ECM has detected a malfunction in the cooling fan 3 control circuit. Some vehicles use a third cooling fan for additional cooling capacity (heavy-duty towing packages, performance vehicles, or hybrid cooling systems). The driver may notice overheating under high-load conditions such as towing, climbing grades, or extended A/C use in hot weather.
Common Causes
30%
Cooling fan 3 relay failure
25%
Cooling fan 3 motor failure (seized or burned out)
20%
Open or shorted wiring in the fan 3 control circuit
15%
Blown fuse for the cooling fan 3 circuit
10%
ECM or fan control module driver fault
Diagnostic Steps
1
Verify the cooling fan 3 fuse is intact. Check both the fuse box diagram and physically test with a multimeter, as visual inspection alone can miss hairline cracks in the fuse element.
2
Swap the fan 3 relay with a known-good identical relay. Command the fan on using the scan tool bidirectional controls and listen/feel for fan operation.
3
Directly power the fan 3 motor with a jumper wire from the battery (include an inline fuse for protection). If the motor runs, the problem is in the control circuit; if not, replace the motor.
4
Measure the voltage at the fan motor connector while commanding fan 3 on — should see battery voltage (12-14V). If voltage is present but the fan doesn't run, the motor is confirmed bad.
5
Check the ECM ground control signal at the relay coil terminal — should pull to less than 1V when the fan is commanded on. No ground signal points to an ECM driver issue or open wire to the ECM.
Estimated Repair Cost
$50 - $600
Parts + labor, varies by vehicle and location
The ECM has detected a malfunction in the cooling fan 3 control circuit. Some vehicles use a third cooling fan for additional cooling capacity (heavy-duty towing packages, performance vehicles, or hybrid cooling systems). The driver may notice overheating under high-load conditions such as towing, c...
The most common cause of P0482 (Cooling Fan 3 Control Circuit Malfunction) is: Cooling fan 3 relay failure
Typical repair costs for P0482 range from $50 to $600, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Overheating risk is somewhat lower since fans 1 and 2 may still function, but under high-load or high-ambient conditions the third fan is critical. Avoid towing, steep grades, and extended idling in hot weather until repaired.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P0482 to identify the root cause.
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Quick Info
Category
Powertrain
System
Engine Cooling System
Difficulty
Type
Generic (SAE)
Recommended Tools
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