A/C Evaporator Temperature Sensor Circuit Low

Where it lives

For P0537, the sensor sits on the circuit this code reports. The description of P0537 reports a fault at the sensor.

Check these first

• A shorted evaporator temperature sensor
• A signal wire shorted to ground
• A corroded connector pulling the signal down
• Low battery voltage
• A refrigerant leak cooling the evaporator too far

What to do next

1. Read the sensor voltage on a scan tool
2. Check battery voltage
3. Test the signal wire for a short to ground
4. Inspect the connector for corrosion
5. Replace the sensor if the low voltage remains
6. Clear the code and retest

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