Reductant Pressure Sensor Circuit Range/Performance

Where it lives

For P204B, the part to look at first is the sensor named here.

Check these first

• A reductant pressure sensor reading outside its valid range
• A low DEF level
• A blockage or leak in the DEF supply
• A failed reductant pressure sensor

What to do next

1. Read the reductant pressure sensor on a scan tool
2. Check the DEF level and refill as needed
3. Inspect the DEF supply for a blockage or leak
4. Compare the sensor reading to a known-good value
5. Replace the reductant pressure sensor if the supply tests good
6. Clear the code and retest

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