What Does P1437 Mean?
The A/C evaporator air temperature sensor is reporting a temperature reading that is higher than the maximum expected range. This indicates either an actual excessive temperature condition or a sensor/circuit fault reading out of normal parameters.
Common Causes
40%
Failed evaporator air temperature sensor reading open circuit
30%
Open circuit or broken wire in sensor signal circuit
20%
Corroded or loose sensor connector causing high resistance
7%
Actual high evaporator temperature due to refrigerant overcharge or restriction
3%
Failed A/C control module misreading sensor input
Diagnostic Steps
1
Step 1: Check evaporator temperature sensor resistance with multimeter and compare to specification at ambient temperature
2
Step 2: Inspect sensor connector for corrosion, moisture, or damaged pins
3
Step 3: Backprobe sensor signal wire and verify voltage matches temperature resistance specification
4
Step 4: Monitor sensor data with scan tool during A/C operation to verify sensor responds to temperature changes
5
Step 5: Check A/C system pressures to rule out actual high evaporator temperature condition
Estimated Repair Cost
$100 - $350
Parts + labor, varies by vehicle and location
The A/C evaporator air temperature sensor is reporting a temperature reading that is higher than the maximum expected range. This indicates either an actual excessive temperature condition or a sensor/circuit fault reading out of normal parameters.
The most common cause of P1437 (A/C Evaporator Air Temperature Circuit High) is: Failed evaporator air temperature sensor reading open circuit
Typical repair costs for P1437 range from $100 to $350, depending on the vehicle, location, and whether you do it yourself or go to a shop.
Safe to drive. A/C performance may be degraded or system may not operate to prevent potential freeze-up or damage.
Start by connecting an OBD2 scanner to read the code and any freeze frame data. Then follow the diagnostic steps specific to P1437 to identify the root cause.
OBDHut Mobile App
Scan codes directly from your car with the OBDHut app.
Coming Soon
Quick Info
Category
Powertrain
System
Climate Control System
Difficulty
Type
Manufacturer
Recommended Tools
OBD2 Scanner
A quality scan tool helps you read codes, view live data, and clear faults.
