Exhaust Aftertreatment Fuel Pressure Sensor Circuit Intermittent/Erratic

Where it lives

For P20E1, the circuit described runs through the sensor. The description of P20E1 reports a fault at the sensor.

Check these first

• An intermittent connection at the exhaust aftertreatment fuel pressure sensor
• Corrosion in the sensor circuit
• A failed exhaust aftertreatment fuel pressure sensor
• A clogged aftertreatment fuel filter

What to do next

1. Read the exhaust aftertreatment fuel pressure sensor on a scan tool while wiggling the harness
2. Check the sensor connector and wiring for corrosion
3. Check the aftertreatment fuel filter for a clog
4. Replace the fuel pressure sensor if the reading jumps
5. Clear the code and retest

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