P2047Generic code

P2047 Code: Reductant Injector Circuit/Open

The P2047 code means an open circuit in the control of the urea (AdBlue or DEF) injector: the component gets no current when it is activated. It can shut the SCR system down and may start a countdown that limits restarting the engine. You can drive for a short time with caution, but get it fixed soon.

Severity
High
Can I keep driving?
Yes, but with caution
Estimated cost
$150 to $900
Difficulty
Medium
System
Emissions Control
Applies to
All OBD2 vehicles

Updated Reviewed by Renzo Chacca

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What the P2047 code means

Modern diesels cut nitrogen oxides with an SCR catalyst. An injector meters urea (AdBlue or DEF) into the exhaust, and the catalyst uses it to turn the NOx into nitrogen and water. A NOx sensor downstream of the catalyst checks that it works.

The computer watches the control circuit from its own driver transistor. The P2047 code means an open circuit: the component gets no current when it is activated. Before you replace the component, check the fuse, the relay, the connector and the wiring, because they are the most common cause.

The injector sits in the exhaust ahead of the SCR catalyst, where it is exposed to heat and to urea crystals.

Measure the resistance of the component at its connector. If it is infinite, the component is open inside. If it is correct, follow the control wire back to the computer looking for a break, especially in the sections near the exhaust or at intermediate connectors.

The AdBlue and SCR system guide explains the engine start countdown and how to take care of the system.

P2047 code symptoms

  • Check engine light or another warning light on.
  • The SCR system stops working and a countdown that limits engine restarts may begin.

Likely causes of the P2047 code

  1. Connector unplugged or with a broken lock.
  2. Open coil. The resistance reads infinite.
  3. Wire cut. Check the areas where it rubs.
  4. Blown fuse, often from an earlier short circuit.

How to diagnose the P2047 code step by step

  1. Activate the component with the scan tool and check whether it responds.
  2. Check the fuse and the relay. Measure voltage on both sides of the fuse, and swap the relay with an identical one.
  3. Measure the supply at the connector. You should see battery voltage with the key on or when it is activated.
  4. Measure the resistance of the component and compare it with the manual. Check the insulation to ground too.
  5. Check the control wire. Look for continuity all the way to the computer and for any short circuit.

How to fix the P2047 code

  • Repair the connector, the wiring or the power supply.
  • Replace the urea (AdBlue) injector if it does not respond with correct power and control.
  • Clear the codes and verify.

Technical reference data

  • 12 volt supply, with control from the engine computer or from the SCR module.
  • These values are only a guide, so look up the manufacturer data for your vehicle.

Brand-specific notes

This code is frequent on diesel vehicles that use AdBlue, from the makes below.

P2047 on Ford, Chevrolet and Ram

This code is frequent on diesel Ford, Chevrolet and Ram vehicles that use AdBlue.

P2047 on Mercedes-Benz, Volkswagen and Peugeot

It is also frequent on diesel Mercedes-Benz, Volkswagen and Peugeot vehicles that use AdBlue.

Frequently asked questions about P2047

Can I drive with a P2047 code?
Only for a short time. The countdown that limits engine restarts may start, so get it fixed soon.
What does the urea (AdBlue) injector do?
Modern diesels cut nitrogen oxides with an SCR catalyst. An injector meters urea (AdBlue or DEF) into the exhaust, and the catalyst uses it to turn the NOx into nitrogen and water. A NOx sensor downstream of the catalyst checks that it works.
Does the part always have to be replaced?
No. Check the fuses, relays, connectors and wiring first.
How much does it cost to fix P2047?
Roughly $150 to $900, depending on whether it is a fuse, a wire or the injector itself.
What does the P2047 code mean?
It is a generic OBD2 code that means the control circuit of the urea (AdBlue) injector is open. The computer sends the command but no current reaches the injector.
Will a P2047 code clear itself?
Only if the cause was a passing glitch, such as a connector that was briefly loose. A cut wire, a blown fuse or an open coil will bring the P2047 code back.
What is the most common cause of P2047?
A connector that is unplugged or has a broken lock, or a cut wire in an area where it rubs near the exhaust. A blown fuse is common too, so check for the short circuit that blew it.

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