Reductant Level Sensor B Circuit

Where it lives

For P21A8, the circuit described runs through the sensor. The description of P21A8 reports a fault at the sensor.

Check these first

• A reductant level sensor B contaminated by urea or carbon
• A failed sensing element inside sensor B
• Corrosion or water in the sensor B connector
• An open or short in the sensor B circuit
• An incorrect sensor B for the vehicle

What to do next

1. Read the reductant level sensor B value on a scan tool
2. Inspect the sensor B connector for corrosion or water
3. Test the sensor B circuit for an open or a short
4. Clean the sensor B of urea or carbon deposits
5. Replace the reductant level sensor B if the circuit tests good
6. Clear the code and retest

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