Powertrain, generic (extended)

P20DD Exhaust Aftertreatment Fuel Pressure Sensor Circuit

Check engine lightOn
EmissionsRelevant
Drive cycleNot required
Limp modePossible

The pressure sensor in the feed line of the exhaust doser lets the control unit meter fuel and spot a stuck valve or plugged nozzle. This code is the general circuit fault of that sensor; signal too low, too high and unsteady have their own codes (P20DF, P20E0, P20E1). Volvo and Mack store it as P20DD13 (open circuit) and issued bulletins for Mack TD with MP10 and Volvo VNL/VNX with the D16 engine, where an internally failed AHI harness sets it together with P249F00 and P113413; the harness is replaced. Guide KC-2157 points to the sensor's wiring and connector. With no valid pressure reading, dosing and regeneration are blocked.

Likely causes

Internally damaged harness to the dosing module and its sensor
Loose or corroded sensor connector
Failed pressure sensor

Symptoms

  • Check engine light on
  • Active regeneration blocked
  • Further codes for the reference voltage or the dosing system

Repair estimate

DifficultyMediumWorkshop job
Parts and labour€100–800
Time0.5–2.5 h

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

Parts involved

aftertreatment fuel pressure sensor

Related codes

P20DEP20DFP20E0P20E1

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