Transmission Fluid Pressure Sensor/Switch C Circuit High

Where it lives

For P0873, the circuit described runs through the sensor. The description of P0873 reports a fault at the sensor.

Check these first

• An open in the sensor C return wire
• A sensor C reading above the expected range
• A stuck line pressure regulator valve
• A backed out sensor C connector pin

What to do next

1. Watch sensor C pressure on a scan tool
2. Test the return wire for an open
3. Wiggle test the sensor C connector
4. Check the line pressure regulator valve
5. Replace sensor C if the value stays high
6. Clear the code and retest

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