Cooling Fan 2 Control Circuit Malfunction
Your car's second cooling fan isn't responding to the engine computer's commands, like a light switch that won't turn the fan on or off. This prevents proper engine temperature control, which can lead to overheating.
The ECM sends a control signal to the cooling fan 2 relay or motor driver, monitoring voltage and current draw to verify the fan responds. If the ECM detects no fan activation within expected timeframes or senses circuit resistance/voltage anomalies, it triggers the fault code.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Fan Control Signal Voltage | 12V relay activation or PWM signal present | No voltage detected or stuck at wrong level |
| Fan Motor Current Draw | 3-8 amps when activated | Zero amps or excessive draw (short circuit) |
Code P0482 is a moderate fault. You can generally drive to a workshop, but avoid long trips or high-load driving (motorway, uphill towing) until it is diagnosed. If the code keeps returning after clearing, or if you notice the symptoms listed above worsening, do not delay professional diagnosis. Many moderate codes have multiple possible root causes — a mechanic with live OBD data can identify the exact fault more efficiently than part-by-part trial and error.
Once the fault is repaired, P0482 can be cleared using any OBD-II scanner. Connect the scanner, navigate to "Clear Codes" or "Erase DTCs," and confirm. The check engine light turns off immediately.
The code will return if the root cause was not actually fixed. The ECM re-detects the fault within 1–3 drive cycles and sets the code again.