Engine Idle Speed Selector Sensor/Switch Circuit Low

Where it lives

For P256C, the circuit described runs through the sensor. The description of P256C reports a fault at the sensor.

Check these first

• A short to ground on the engine idle speed selector circuit
• An open in the engine idle speed selector wiring
• A failed engine idle speed selector sensor
• Low battery voltage weakening the signal

What to do next

1. Read the engine idle speed selector input on a scan tool
2. Test the idle speed selector circuit for a short to ground
3. Check the idle speed selector wiring for an open
4. Check battery voltage and connections
5. Replace the engine idle speed selector sensor if the circuit tests good
6. Clear the code and retest

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