Transmission Park Position Sensor/Switch B Circuit Low

Where it lives

For P07B9, the circuit described runs through the sensor. The description of P07B9 reports a fault at the sensor.

Check these first

• A short to ground in the park position switch B circuit
• A faulty park position switch B
• Corrosion at the switch B connector
• Low battery voltage
• A PCM fault on the switch B input

What to do next

1. Read park position switch B voltage on a scan tool
2. Test the switch B circuit for a short to ground
3. Check the switch B connector and wiring
4. Check the battery voltage and ground
5. Replace the switch if the circuit tests good
6. Clear the code and retest

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