P20D7 code meaning
Exhaust Aftertreatment Fuel Supply Control Circuit/Open
Powertrain system Generic code P20xx codes Check engine light
What P20D7 means
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.
P20D7 at a glance
- Check engine lightYes, usually on
- Emissions testCan fail
- Limp modePossible
- Repair difficultyMedium
- Typical labor0.5 to 2.5 hours
- Clears after repairWhen cleared with a scanner
Symptoms of P20D7
- Check engine light on
- Active regeneration not possible
- Soot warning, later reduced power
Common causes of P20D7
- Most likelyLoose or corroded connector at the dosing module
- PossibleBroken wire in the dosing module harness
- PossibleOpen coil in the fuel shutoff valve
Check the most likely causes first. Replacing parts by guesswork is the most expensive way to clear a code.
Parts involved
Aftertreatment fuel supply solenoid
What each part of P20D7 means
| P | Powertrain system: engine, fuel system, ignition, emissions and transmission. |
| 2 | Generic code (second SAE range): it means the same on every make. |
| 0 | Area: fuel and air metering and auxiliary emission controls. |
| D7 | The exact fault in that area. |
What to do next
- Note P20D7 and any other codes stored with it: several codes together often point to one cause.
- Check for loose connectors and damaged wiring around the parts the code names.
- Check open recalls for your car: some faults are fixed for free by the dealer. Enter your VIN.
- Clear the code only after the repair. If it comes back, the fault is still there.
Buying a used car? Scan it for stored codes before you pay. A recently cleared memory can hide a problem.
Questions about P20D7
What does P20D7 mean?
P20D7 means "Exhaust Aftertreatment Fuel Supply Control Circuit/Open". 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. It is a generic code, so it means the same on every make.
Is it safe to drive with P20D7?
Drive gently and only to a workshop. With P20D7 the car can go into limp mode (reduced power) to protect itself.
Will P20D7 fail an emissions test?
Yes, it can. P20D7 is emissions-related, so most inspection programs fail a car while it is stored or while the check engine light is on.
How hard is P20D7 to fix?
Difficulty: medium. A typical repair takes 0.5 to 2.5 hours of work. This is a job for a workshop.
Will P20D7 clear itself after the repair?
Clear the code with a scanner after the repair. If the fault is fixed, it does not come back.