Transmission Fluid Pressure Sensor/Switch A Circuit Low

Where it lives

For P0842, the circuit described runs through the sensor. The description of P0842 reports a fault at the sensor.

Check these first

• A short to ground in the sensor A signal wire
• A sensor A reading below the expected range
• Low transmission fluid level
• Air pulled into the pump pickup

What to do next

1. Check the transmission fluid level
2. Watch sensor A pressure on a scan tool
3. Test the signal wire for a short to ground
4. Check the pump pickup for a leak
5. Replace sensor A if the value stays low
6. Clear the code and retest

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