Powertrain, generic (extended)

P20DE Exhaust Aftertreatment Fuel Pressure Sensor Circuit Range/Performance

Check engine lightOn
EmissionsRelevant
Drive cycleRequired
Limp modePossible

The doser feed pressure sensor gives a signal inside its electrical limits, yet the value does not fit what the system is doing, for example no pressure rise when the supply valve opens. Hino uses the code widely: SB-18-029 (2017–2019 J08 and J05 trucks, MIL on) has a specific sensor batch replaced, earlier notes blame a fuel cut valve that hangs or dirty fuel clogging a filter, and SB-22-007 swaps a 2020 bubbler filter. Volvo and Mack, in guide KC-2157, suspect the sensor, the air supply, the nozzle or the lines. So the fault often lies in the hydraulics, not the sensor. Electrical faults are P20DD, P20DF, P20E0 and P20E1.

Likely causes

Restricted fuel or separator filter from contaminated fuel
Sticking fuel cut or supply valve
Pressure sensor outside its specification
Plugged nozzle or leaking fuel/air line

Symptoms

  • Check engine light on
  • Regeneration interrupted or blocked
  • Sometimes further fuel pressure codes such as P0087

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€50–1,200
Time0.5–3 h

Typical range across vehicles; the real cost depends on what the testing finds.

Parts involved

aftertreatment fuel pressure sensor

Related codes

P20DDP20DFP20E0P20E1P20DCP0087

References: static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov, static.nhtsa.gov.