P2047

Reductant Injection Valve Circuit/Open Bank 1 Unit 1

P2047 is a generic OBD-II powertrain diagnostic trouble code: Reductant Injection Valve Circuit/Open Bank 1 Unit 1. It is logged by the engine control unit when the scr/adblue monitor detects that a specific fault threshold has been exceeded — typically resulting in the malfunction-indicator lamp (MIL / check-engine light) being illuminated.

Code
P2047
Group
Powertrain
System
SCR/AdBlue
Severity
Warning (MIL on, possible limp mode)
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What P2047 means

P2047 indicates that the ECM has detected an open circuit condition in the reductant (DEF/AdBlue) injector control circuit for Bank 1, Unit 1. The reductant injector is the solenoid-operated nozzle that sprays urea solution into the exhaust stream upstream of the SCR catalyst to facilitate NOx reduction.

An open circuit means the ECM cannot complete the ground or supply path needed to energize the injector solenoid. This prevents any reductant from being dosed into the exhaust, which will rapidly cause NOx conversion efficiency to drop. The ECM detects this by monitoring actual current flow (or lack thereof) through the injector driver circuit during a commanded injection event.

Depending on the vehicle's emissions derate strategy, P2047 may trigger a torque reduction or vehicle speed limitation after a defined period of SCR non-compliance. This is a regulatory requirement on vehicles subject to SCR-based NOx reduction mandates, making prompt repair important to avoid operational restrictions.

Common causes

Most-frequently reported root causes when P2047 is logged.

  • 1
    Open circuit in the reductant injector wiring harness or connector.
  • 2
    Failed reductant injector solenoid (internally open coil).
  • 3
    Corroded or damaged injector connector terminals.
  • 4
    Faulty DEF pump module that supplies the injector drive circuit.
  • 5
    Broken wire between ECM/SCR controller and the injector.
  • 6
    ECM injector driver circuit failure.
  • 7
    DEF injector clogged and solenoid damaged from crystallized urea.

Symptoms drivers notice

MIL and potentially a DEF/SCR warning light illuminated.
No reductant being injected into the exhaust system.
Rising NOx emissions potentially triggering secondary efficiency codes.
Possible torque derate or speed limitation depending on vehicle calibration.
Possible white crystalline deposits around the reductant injector nozzle.

How to diagnose P2047

A typical diagnostic flow when this code is present.

  1. 1
    Scan for all DTCs and capture freeze frame data; note any companion NOx efficiency or SCR codes.
  2. 2
    Inspect the reductant injector electrical connector for corrosion, damage, or urea crystal buildup.
  3. 3
    Measure injector solenoid resistance at the injector connector and compare to specification.
  4. 4
    Perform a continuity check on both the supply and control wires between the injector and ECM/SCR module.
  5. 5
    Check for proper supply voltage at the injector connector with key on.
  6. 6
    If wiring checks pass and solenoid resistance is out of spec or open, replace the reductant injector.
  7. 7
    After repair, clear codes and run a reductant dosing actuation test via scan tool to confirm injector operation.

Related powertrain codes

Frequently asked questions

Can a clogged DEF injector cause P2047?

Clogging itself does not create an open circuit, but prolonged urea crystallization around the solenoid can physically damage the coil windings, eventually causing an open circuit fault.

How quickly will a derate activate after P2047 sets?

This varies by OEM calibration and regulatory requirements; some vehicles allow hundreds of miles before derate, while others derate within one or two drive cycles.

Is the reductant injector the same as a diesel injector?

No. The reductant injector sprays aqueous urea (DEF) into the exhaust stream and operates at much lower pressure than fuel injectors.

Can I clear P2047 and keep driving?

Clearing the code without repair will not restore dosing, and the code will return quickly; the vehicle may enter a derate condition after a set number of re-occurrences.

Disabling P2047 in software

RaceTune can permanently disable P2047 — and any other OBD-II diagnostic trouble code — on every ECU family we support. The monitor is disabled inside the ECU itself, so the fault stops being logged: the warning light stays off and the engine never enters limp mode for this code. The change is tied to your exact software version.

Permanent
The monitor is disabled in the ECU itself — not just cleared. It cannot return.
Tailored to your file
Each patch is matched to your specific software version — never a one-size-fits-all file.
Reversible
The original file is always preserved. Reflash the stock to return the ECU to factory state.

ECUs with a P2047 disable in our catalogue

Confirmed coverage from our recipe database — we support many more families. Upload your file and our identifier will match it automatically.

  • Bosch EDC17C60 verified 2 software versions
  • Bosch MD1CP004 verified 1 software version

Software modifications affect emissions compliance and are not road-legal in many jurisdictions. RaceTune service files are intended for motorsport, off-road, and export use.

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