P2047 — Reductant Injector Circuit Open
Seen on: Heavy Truck/Diesel
Reductant Injector Circuit Open. Common causes: Failed DEF doser injector.
Your code rides along, so nearby mechanics see the fault before they quote you.
How serious is it?
Serious. Power derate likely — plan to stop soon.
Most likely causes
- Failed DEF doser injector
- Wiring fault
- connector corrosion
First moves (roadside)
- Check doser connector
- measure coil resistance 1-3 ohms
- test supply voltage
FAQ
Reductant Injector Circuit Open. Common causes: Failed DEF doser injector.
Serious — Power derate likely — plan to stop soon.
The most common cause is: Failed DEF doser injector. Other possibilities include Wiring fault; connector corrosion.
Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.
Find a mechanic or related guides
General diagnostic guidance for diesel engines (Cummins, Detroit, PACCAR, Volvo, Mack and more). Not a substitute for a scan-tool diagnosis on your specific truck.