Reductant Level Sensor A Circuit Range/Performance

Where it lives

For P203B, start at the sensor the description names.

Check these first

• A reductant level sensor A reading that drifts from the true DEF level
• A DEF level below the sensor A's valid range
• High resistance in the sensor A circuit
• A failing reductant level sensor A sender

What to do next

1. Read the reductant level sensor A value on a scan tool
2. Compare the sensor A reading to the actual DEF tank level
3. Refill the DEF tank to a known level and recheck
4. Test the sensor A circuit for added resistance
5. Replace the reductant level sensor A if the reading stays off
6. Clear the code and retest

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