Fan Control Circuit Malfunction
Your engine's cooling fan isn't responding correctly to temperature changes, like a thermostat that won't trigger the fan to turn on or off. The ECU detects an electrical problem in the fan circuit—either the fan won't spin when it should, or the control signal is broken.
The ECM monitors fan motor current draw and PWM (pulse-width modulation) control signals to verify the cooling fan activates at the correct coolant temperature threshold. It expects specific voltage and amperage patterns when commanding the fan relay or direct control circuit.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Fan Motor Current Draw | 5-12 amps when active | Zero amps or shorted circuit >15 amps |
| Coolant Temp Activation | Fan on at 195-210°F | No fan response at setpoint or stuck on |
Code P1141 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, P1141 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.