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P2047 — Reductant Injector Circuit Open

SeriousDEF/SCRPower derate likely — plan to stop soon

Seen on: Heavy Truck/Diesel

Reductant Injector Circuit Open. Common causes: Failed DEF doser injector.

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How serious is it?

Serious. Power derate likely — plan to stop soon.

Most likely causes

  1. Failed DEF doser injector
  2. Wiring fault
  3. connector corrosion

First moves (roadside)

  1. Check doser connector
  2. measure coil resistance 1-3 ohms
  3. test supply voltage

FAQ

What does P2047 mean?

Reductant Injector Circuit Open. Common causes: Failed DEF doser injector.

How serious is P2047?

Serious — Power derate likely — plan to stop soon.

What's the most likely cause of P2047?

The most common cause is: Failed DEF doser injector. Other possibilities include Wiring fault; connector corrosion.

Can I keep driving with P2047?

Power derate likely — plan to stop soon. When in doubt, get a qualified mobile diesel tech on the truck before continuing.

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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.