P20DDExhaust Aftertreatment Fuel Pressure Sensor Circuit
- 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 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.
- What you may notice
- Check engine light on
- Active regeneration blocked
- Further codes for the reference voltage or the dosing system
- Likely causes
- LikelyInternally damaged harness to the dosing module and its sensor
- PossibleLoose or corroded sensor connector
- RareFailed pressure sensor
- 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: €100 – €800
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.