P20D7Exhaust Aftertreatment Fuel Supply Control Circuit/Open
- Generic OBD-II code · Powertrain
- Turns on the check-engine light
- Matters for the ITP
- Can trigger limp mode
- How the car detects it
- Upstream of the exhaust doser sits a valve that releases fuel to it only when a regeneration is wanted, often called the shutoff or fuel cut valve. This code reports an open in its control circuit. Volvo and Mack store it as P20D713 (failure type 13 = open) and, in troubleshooting guide KC-2157, send the technician to the wiring and connector of the AHI module, where this valve is housed. Hino's J08E trucks use a fuel cut valve of the same kind. With the valve circuit open, no fuel reaches the doser and active regeneration stops. Shorts are P20D9 (low) and P20DA (high); mechanical sticking is P20DB and P20DC.
- What you may notice
- Check engine light on
- Active regeneration not possible
- Soot warning, later reduced power
- Likely causes
- LikelyLoose or corroded connector at the dosing module
- PossibleBroken wire in the dosing module harness
- PossibleOpen coil in the fuel shutoff valve
- 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 – €1,200
- Related codes
Explanation from obdex (CC0), exactly as the app shows it. Guidance only; confirm with a workshop.