Transmission Fluid Pressure Sensor/Switch D Circuit High

Where it lives

For P0878, the sensor sits on the circuit this code reports. The description of P0878 reports a fault at the sensor.

Check these first

• An open in the sensor D return wire
• A sensor D reading above the expected range
• A stuck line pressure regulator valve
• A signal wire shorted to voltage

What to do next

1. Watch sensor D pressure on a scan tool
2. Test the return wire for an open
3. Test the signal wire for a short to voltage
4. Check the line pressure regulator valve
5. Replace sensor D if the value stays high
6. Clear the code and retest

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