Exhaust Gas Recirculation Sensor A Circuit High Input

Where it lives

For P0406, the circuit described runs through the sensor. The description of P0406 reports a fault at the sensor.

Check these first

• Faulty EGR position sensor
• Shorted sensor signal wire to voltage
• Poor sensor ground connection
• Carbon buildup holding the pintle at a false position
• PCM fault

What to do next

1. Inspect the EGR sensor connector and wiring for shorts
2. Check sensor ground circuit
3. Read EGR position and commanded position on an OBD-II scanner
4. Clean carbon coking that may bind the pintle
5. Replace the EGR valve or sensor if the signal stays high

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