A/C Evaporator Air Temperature Circuit Low
Your air conditioning system has a temperature sensor that's reading too cold or not working properly. It's like a thermometer that's stuck on a low reading, preventing the AC from operating normally.
The ECU monitors the evaporator temperature sensor to regulate AC compressor engagement and prevent icing. When the sensor signal falls below the minimum threshold voltage, the ECU interprets this as a circuit low fault and disables AC operation as a safety measure.
| Parameter | Normal Range | Fault Condition |
|---|---|---|
| Evaporator Temperature Sensor Voltage | 0.5V to 4.5V (corresponding to -40°C to +125°C) | Below 0.1V or open circuit condition |
| Evaporator Air Temperature | Above 2°C during AC operation | Below 0°C continuously or sensor reads invalid |
Code P1441 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, P1441 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.