EGR Temperature Sensor A Circuit Intermittent/Erratic

Where it lives

For P040E, the sensor sits on the circuit this code reports. The description of P040E reports a fault at the sensor.

Check these first

• An intermittent EGR temperature sensor A
• A loose sensor A connector
• A chafed sensor A wire that rubs with engine movement
• Moisture in the sensor A connector
• A failing ECM input on the sensor A channel

What to do next

1. Wiggle test the sensor A harness while watching the signal
2. Inspect the sensor A connector for moisture
3. Check the sensor A wire for chafing
4. Log the signal over a drive to catch dropouts
5. Replace sensor A if the dropouts continue
6. Clear the code and retest

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