P20DFExhaust Aftertreatment Fuel Pressure Sensor Circuit Low
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- The signal of the doser feed pressure sensor sits below its lower limit. Electrically that suggests a grounded signal line or a missing reference voltage. Hino describes its P20DF as the line pressure sensor reading too low and shows that real pressure loss can trigger it too: a fuel cut valve that hangs, or dirty fuel restricting the filter ahead of the dosing injector. Hino also changed the detection threshold by software on 2013–2016 cab-over trucks and corrected the measuring point in its workshop manual. So the check should cover both the sensor circuit and the fuel supply. High signal is P20E0, the generic circuit fault P20DD.
- What you may notice
- Check engine light on
- Regeneration blocked
- Likely causes
- LikelyReal low pressure from a restricted filter or contaminated fuel
- PossibleSignal wire shorted to ground or reference voltage lost
- PossibleFuel cut valve sticking
- RareOutdated detection threshold, fixed by a software update
- Inspection (ITP)
- Matters for the ITP. While the check-engine light is on, the car fails the emissions check.
- Repair
- Medium · Usually a job for a workshop.Typical cost: €50 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.