Powertrain, generic (extended)

P20E0 Exhaust Aftertreatment Fuel Pressure Sensor Circuit High

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The doser feed pressure sensor reports a signal above its upper electrical limit. On a typical three-wire sensor this happens when the signal line is open and pulled up, shorted to the 5 V reference or to battery voltage, or when the ground is lost. Volvo and Mack store it as P20E000 and in guide KC-2157 direct technicians to the sensor's wiring and connector. In 2025 both brands also ran service campaigns on 2024–2025 trucks (at Mack with MP7/MP8 engines) built with an AHI fuel pressure sensor outside specification, which could set codes and upset aftertreatment control. Low signal is P20DF, plausibility P20DE and unsteady signal P20E1.

Likely causes

Signal wire open or shorted to reference or battery voltage
Lost sensor ground
Sensor from a faulty production batch

Symptoms

  • Check engine light on
  • Active regeneration blocked

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–600
Time0.5–2 h

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

Parts involved

aftertreatment fuel pressure sensor

Related codes

P20DDP20DEP20DFP20E1

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