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P2047 — Reductant Injection Valve Circuitopen Bank 1 Unit 1

Manufacturer-specificPowertrain (engine & transmission)

P2047 indicates that the powertrain control module has detected an open circuit condition in the reductant (urea) injection valve circuit for Bank 1, Unit 1 of the diesel exhaust fluid (DEF) system.

Symptoms

What causes it — most likely first

1. Open or shorted wiring in the reductant injection valve circuit

A broken wire, corroded connector, or damaged harness can interrupt the signal to the valve.

2. Faulty reductant injection valve (Unit 1)

The valve itself may have failed internally, causing an open circuit condition.

3. Defective valve driver circuit or relay

The driver module that supplies power to the injection valve can fail, resulting in no voltage at the valve.

4. Poor ground connection for the valve circuit

A loose or corroded ground can mimic an open circuit to the control module.

5. Powertrain control module (PCM) malfunction

Only consider after all wiring and component checks; a rare cause where the PCM cannot detect the valve signal.

How it's diagnosed

  1. Inspect the wiring harness and connectors for damage, corrosion, or looseness; repair as needed.
  2. Measure voltage at the reductant injection valve connector while the engine commands DEF injection; compare to specifications.
  3. Test the injection valve resistance to verify it is within spec; replace the valve if out of range.
  4. Check the valve driver relay or driver circuit for proper operation and continuity.
  5. If all components test good, perform a PCM diagnostic test or reflash; replace PCM only as a last resort.

Code facts & related codes

SystemPowertrain (engine & transmission)
StandardizationManufacturer-specific (P1/B1/C1/U1)
Related codesP2040 — Reductant Injection Air Pressure SensoP2041 — Reductant Injection Air Pressure SensoP2042 — Reductant Temperature Sensor CircuitP2043 — Reductant Temperature Sensor Circuit RP2044 — Reductant Temperature Sensor Circuit LP2045 — Reductant Temperature Sensor Circuit H

Frequently asked

Can I simply replace the PCM to clear P2047?

No. The PCM is rarely at fault for this code. Replacing it without verifying wiring and valve operation is usually unnecessary and costly.

Will the vehicle run without DEF if this code appears?

The engine may continue to run, but NOx emissions will increase and the vehicle may eventually enter limp mode or fail an emissions inspection.

Is it safe to drive with P2047 active?

Short trips are possible, but prolonged driving can cause further damage to the DEF system and may lead to reduced performance or regulatory penalties.

How long does it typically take to fix this issue?

If the problem is wiring or a connector, it can often be repaired in under an hour. Replacing a faulty injection valve may take 1‑2 hours depending on accessibility.