- Faulty Reductant Pressure Sensor
- Reductant Pressure Sensor harness is open or shorted
- Reductant Pressure Sensor circuit poor electrical connection
- Engine Light ON (or Service Engine Soon Warning Light)
P204a DescriptionThe reductant pressure sensor provides feedback to Powertrain Control Module (PCM), which regulates system pressure by controlling pump speed using pulse width modulation. The reductant pressure sensor is integral to reductant pump assembly.
P204A Information for specific makes
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