Reductant Level Sensor A Circuit Low

Where it lives

For P203C, the circuit described runs through the sensor. The description of P203C reports a fault at the sensor.

Check these first

• A short to ground on the reductant level sensor A signal wire
• A failed reductant level sensor A pullup
• A DEF level below the sensor A pickup
• A corroded sensor A connector dragging the signal low

What to do next

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

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