A/C Refrigerant Temperature Sensor B Circuit Low

Where it lives

For P0EC3, the sensor sits on the circuit this code reports. The description of P0EC3 reports a fault at the sensor.

Check these first

• A short to ground on the refrigerant temperature sensor B signal wire
• An open in the sensor B circuit
• A failed sensor B reading low
• A loose connector at sensor B

What to do next

1. Read A/C refrigerant temperature sensor B on a scan tool
2. Test the sensor B signal wire for a short to ground
3. Check the sensor B connector and pins
4. Verify reference voltage at sensor B
5. Replace the sensor B if the circuit tests good
6. Clear the code and retest

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