Skip the auto shop - Our mechanics make house calls

P2047 OBD-II Trouble Code: Reductant Injector Circuit/Open Bank 1 Unit 1

trouble code logo

P2047 trouble code definition

The P2047 code is a general OBD2 trouble code that points to a fault within the reductant injector circuit.

What the P2047 code means

The P2047 code means a fault is present in the reductant injection valve circuit, bank 1 unit 1. The reductant injector is used to reduce emissions gases exiting the exhaust by injecting either air or chemicals depending on the usage and vehicle. When the ECU detects the fault in the reductant injector circuit, it will set the P2047 code and the Check Engine Light will be displayed on the dashboard.

What causes the P2047 code?

  • Poor electrical connection
  • Open or short in the reductant injector circuit
  • EGT sensor failure
  • Exhaust leaks

What are the symptoms of the P2047 code?

The Check Engine Light is the most common symptom of the P2047 code. In rare cases, the driver may notice black smoke under heavy acceleration.

How does a mechanic diagnose the P2047 code?

Using this step by step diagnostic procedure technicians may successfully diagnose the P2047 code:

  • Hook up a scan tool to the DLC port and check for any codes present.

  • Note the codes and freeze frame data from all the codes.

  • Clear the stored codes from the ECU.

  • Perform a road test under similar conditions as the freeze frame data indicated.

  • Check that the P2047 is the code that has come back after the test drive.

  • A visual inspection will be done looking for signs of exhaust leaks or damaged wiring for either the sensor itself of the harness.

  • Using a multimeter, the OHMs will be checked to the exhaust gas temperature sensor.

  • The vehicle will be ran and the presence of exhaust leaks will be checked.

Common mistakes when diagnosing the P2047 code

Commonly an exhaust leaks is often overlooked as the cause of the P2047 code. When an exhaust leak is present it causes air to enter the exhaust and this changes the readings of the oxygen sensors and the exhaust gas temperature readings.

How serious is the P2047 code?

  • The P2047 code will generally not have any drivability concerns that would prevent the vehicle from being driven.

  • This code will cause the vehicle to fail emissions testing and may cause more exhaust emissions to exit the exhaust.

What repairs can fix the P2047 code?

  • Fixing poor electrical connection issues
  • Repairing or replacing the reductant injector wiring harness
  • Replacing the exhaust gas temperature sensor
  • Repairing of exhaust leaks

Additional comments for consideration regarding the P2047 code

Exhaust leaks can cause strange symptoms in modern cars. A easy way to find if the exhaust is leaking is to inspect the exhaust system while the vehicle is running. Caution should be taken when doing this as the exhaust can easily burn you.

Exhaust leaks can have a whistling sound or can be felt. In some cases the exhaust leak will leave a black sooty mark on the exhaust pipe right where the leak is making it very easy to find.

Need help with a P2047 code?

YourMechanic offers certified mobile mechanics who will come to your home or office to diagnose and repair your vehicle. Get a quote and book an appointment online or speak to a service advisor at 1-800-701-6230.

The statements expressed above are only for informational purposes and should be independently verified. Please see our terms of service for more details

Skip the repair shop, our top-rated mechanics come to you.

At your home or office

Choose from 600+ repair, maintenance & diagnostic services. Our top-rated mechanics bring all parts & tools to your location.

Fair & transparent pricing

See labor & parts costs upfront, so you can book with confidence.

12-month, 12,000-mile warranty

Our services are backed by a 12-month, 12,000-mile warranty for your peace of mind.

Get A Quote

Ask a Mechanic
(100% Free)

Have a car question? Get free advice from our top-rated mechanics.

Ask A Mechanic
Over 10,000 questions answered!

Need Help With Your Car?

Our certified mobile mechanics make house calls in over 2,000 U.S. cities. Fast, free online quotes for your car repair.


Post a question and get free advice from our certified mechanics.


More related articles

How to Avoid Back Pain in a Car
If you have back problems, sitting in a car for an extended period of time can be excruciating. Even without back problems, you could experience discomfort and soreness from...
P2159 OBD-II Trouble Code: Vehicle Speed Sensor B Range/Performance
Diagnostic Trouble Code (DTC): P2159 P2159 code definition Vehicle Speed Sensor B Range/Performance Related Trouble Codes: P2158: Vehicle Speed Sensor B P2160: Vehicle Speed Sensor B Circuit Low P2161:...
P2428 OBD-II Trouble Code: Exhaust Gas Temperature Too High Bank 1
P2428 code definition A P2428 trouble code signifies that the PCM has detected a problem in the exhaust gas temperature sensor circuit in bank 1, which subsequently contains the number one...

Related questions

Q: Low oil comes on..trys to stall while accelerating...jerks,etc. Will not start.

Hey there: The problem you're having with your GMC Envoy stalling could be caused by all or one of the components you've mentioned in your question. A dirty fuel filter will restrict the flow of gasoline to the injectors, as...

Q: P0601

This seems to be a common problem on Chrysler Dodge and Jeep vehicles. The P0601 code indicates that your powertrain control module is having a malfunction that has occurred more than six times. It is possible that a battery replacement...

Q: Getting Red Lighting Bolt Warning Light and Check Engine Light

Hi there. Assuming the Check Engine Light and red lightning bolt were on before your vehicle experienced the no start condition. This would indicate a malfunction in the electronic throttle control system. The computer has recognized the fault and stored...