What Does P1440 Mean?
The A/C refrigerant temperature sensor is reporting values outside the expected range or shows implausible readings. The PCM monitors this sensor to optimize A/C compressor operation and protect the system from damage.
Common Causes
45%
Faulty A/C refrigerant temperature sensor
30%
Damaged or corroded wiring/connectors in sensor circuit
15%
Short circuit to ground or power in sensor wiring
10%
PCM internal fault in sensor circuit processing
Diagnostic Steps
1
Step 1: Locate the A/C refrigerant temperature sensor (typically on A/C line near compressor) and inspect connector for corrosion or damage
2
Step 2: Measure sensor resistance and compare to manufacturer specifications at ambient temperature
3
Step 3: Check sensor circuit voltage and ground with key on, engine off using multimeter
4
Step 4: Inspect wiring harness for pinched wires, chafing, or evidence of shorts along entire length
5
Step 5: Monitor sensor data with scan tool during A/C operation to verify real-time values match physical conditions
Estimated Repair Cost
$100 - $350
Parts + labor, varies by vehicle and location
The A/C refrigerant temperature sensor is reporting values outside the expected range or shows implausible readings. The PCM monitors this sensor to optimize A/C compressor operation and protect the system from damage.
The most common cause of P1440 (A/C Refrigerant Temperature Circuit Range/Performance) is: Faulty A/C refrigerant temperature sensor
Typical repair costs for P1440 range from $100 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
No direct safety impact. Vehicle remains safe to drive but A/C system may not operate efficiently or may shut down to prevent damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1440 to identify the root cause.
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Quick Info
Category
Powertrain
System
Air Conditioning/Climate Control
Difficulty
Type
Manufacturer
Recommended Tools
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