Exhaust Aftertreatment Fuel Pressure Sensor Circuit Range/Performance

Where it lives

For P20DE, the part to look at first is the sensor named here.

Check these first

• An exhaust aftertreatment fuel pressure sensor reading outside its range
• An open or short in the sensor circuit
• A restriction in the aftertreatment fuel system
• A failed exhaust aftertreatment fuel pressure sensor

What to do next

1. Read the exhaust aftertreatment fuel pressure sensor on a scan tool
2. Compare the sensor reading to a mechanical gauge
3. Test the sensor circuit for open and short faults
4. Check the aftertreatment fuel system for a restriction
5. Replace the fuel pressure sensor if the gauge agrees
6. Clear the code and retest

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