Reductant Level Sensor C Circuit Low

Where it lives

For P21AF, the circuit described runs through the sensor. The description of P21AF reports a fault at the sensor.

Check these first

• A short to ground in the reductant level sensor C circuit
• A failed sensing element inside sensor C
• Corrosion or water in the sensor C connector
• An open in the sensor C circuit
• An incorrect sensor C for the vehicle

What to do next

1. Read the reductant level sensor C value on a scan tool
2. Test the sensor C circuit for a short to ground
3. Inspect the sensor C connector for corrosion or water
4. Check the sensor C reading against the tank level
5. Replace the reductant level sensor C if the circuit tests good
6. Clear the code and retest

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