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P2047 2018 GMC Sierra Code - Reductant Injector Control Circuit

Quick Answer

The P2047 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the reductant injector control circuit. Common causes include Faulty Reductant Injector: The reductant injector itself may be faulty, causing issues with the control circuit, Wiring Issues: Damaged or corroded wiring connections can disrupt the communication between the PCM and the reductant injector, PCM Malfunction: A malfunctioning PCM can also trigger the P2047 code by sending incorrect signals to the reductant injector. Severity is High - diagnose this code as soon as possible. Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.

What it means
P2047 2018 GMC Sierra indicates Reductant Injector Control Circuit.
Common causes
Common causes include Faulty Reductant Injector: The reductant injector itself may be faulty, causing issues with the control circuit, Wiring Issues: Damaged or corroded wiring connections can disrupt the communication between the PCM and the reductant injector, PCM Malfunction: A malfunctioning PCM can also trigger the P2047 code by sending incorrect signals to the reductant injector.
Severity
High - diagnose this code as soon as possible.
Can I drive?
Driving is not recommended if the warning light is flashing, the engine runs poorly, or safety-related symptoms are present.
What is this?
Table of contents Created and updated by William Orellana on Sep 15, 2024
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Code P2047 2018 GMC Sierra Description

The P2047 diagnostic trouble code (DTC) for a 2018 GMC Sierra relates to the reductant injector control circuit. In vehicles equipped with a selective catalytic reduction (SCR) system, the reductant injector is responsible for injecting a urea-based solution (AdBlue) into the exhaust stream to reduce harmful emissions. The control circuit ensures that the injector operates correctly and at the right times to maintain optimal emissions levels.

OBDII Code P2047 2018 GMC Sierra - Reductant Injector Control Circuit
P2047 2018 GMC Sierra Code - Reductant Injector Control Circuit

Common Causes of P2047 2018 GMC Sierra

  1. Faulty Reductant Injector: The reductant injector itself may be faulty, causing issues with the control circuit.
  2. Wiring Issues: Damaged or corroded wiring connections can disrupt the communication between the PCM and the reductant injector.
  3. PCM Malfunction: A malfunctioning PCM can also trigger the P2047 code by sending incorrect signals to the reductant injector.
  4. Sensor Malfunction: A faulty sensor within the SCR system can lead to incorrect readings and trigger the code.

Symptoms of P2047 2018 GMC Sierra

  1. Check Engine Light: The most common symptom associated with the P2047 code is the illumination of the check engine light on the dashboard.
  2. Reduced Fuel Efficiency: A malfunctioning reductant injector control circuit can lead to decreased fuel efficiency as the engine may not be operating at optimal levels.
  3. Engine Misfires: The engine may experience misfires or rough idling due to improper injection of the reductant solution.
  4. Increased Emissions: The vehicle may fail emissions tests or emit higher levels of pollutants due to the SCR system not functioning correctly.

How to Fix P2047 2018 GMC Sierra

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific DTC and pinpoint the exact cause of the problem.
  2. Inspect Wiring: Check the wiring connections for any damage or corrosion and repair or replace as necessary.
  3. Test Reductant Injector: Test the reductant injector to ensure it is functioning correctly and replace if needed.
  4. Check Sensors: Inspect the sensors within the SCR system to ensure they are providing accurate readings.
  5. Clear DTC: After completing the repairs, clear the DTC and test drive the vehicle to ensure the issue has been resolved.

Cost to Fix P2047 2018 GMC Sierra

The cost of repairing a P2047 code can vary depending on the specific cause of the issue. In general, the cost of parts for a reductant injector control circuit repair can range from $200 to $500, with labor costs adding an additional $100 to $200. Keep in mind that labor rates at auto repair shops can vary, so it's advisable to check with local shops for a more accurate estimate.

What does this mean?

Tech Notes for P2047 2018 GMC Sierra









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About the author: William Orellana is a Master Mechanic and Mechanical Engineer with over 30 years of experience diagnosing and repairing vehicles. Learn more about his background.

Frequently Asked Questions about P2047 2018 GMC Sierra Code

1. What are the common symptoms of OBDII code P2047 in a 2018 GMC Sierra?

The common symptoms of code P2047 include the Check Engine Light illuminating on the dashboard, reduced engine performance, and potential difficulty starting the vehicle.

2. What does the OBDII code P2047 on a 2018 GMC Sierra indicate?

Code P2047 on a 2018 GMC Sierra specifically relates to a fault in the Reductant Injector Control Circuit.

3. What are the possible causes of OBDII code P2047 in a 2018 GMC Sierra?

Possible causes of code P2047 include a faulty reductant injector, wiring issues in the control circuit, a corroded connector, or a problem with the powertrain control module.

4. How can I diagnose OBDII code P2047 in my 2018 GMC Sierra?

To diagnose code P2047, a technician may use a scan tool to read the code, inspect the reductant injector and its wiring, check for corrosion in the connectors, and perform a thorough visual inspection of the system.

5. Can I continue driving my 2018 GMC Sierra with OBDII code P2047?

It is not recommended to continue driving your GMC Sierra with code P2047 as it can lead to reduced engine performance and potential damage to the vehicle's emissions system.

6. How can I repair OBDII code P2047 in my 2018 GMC Sierra?

Repairing code P2047 may involve replacing the faulty reductant injector, repairing any damaged wiring or connectors, or resetting the powertrain control module.

7. Is OBDII code P2047 in a 2018 GMC Sierra easy to fix?

The complexity of fixing code P2047 in a 2018 GMC Sierra depends on the underlying cause. Some cases may require simple repairs, while others may need more extensive troubleshooting by a professional technician.

8. Can a DIY enthusiast fix OBDII code P2047 in a 2018 GMC Sierra?

While some DIY enthusiasts may have the skills to address simple causes of code P2047, it is recommended to consult a professional technician for accurate diagnosis and repair to avoid further issues.

9. Will resetting the Check Engine Light resolve OBDII code P2047 in my 2018 GMC Sierra?

Simply resetting the Check Engine Light will not fix the underlying issue causing code P2047. It is crucial to diagnose the problem accurately and address it to prevent the code from reoccurring.

10. How much does it cost to repair OBDII code P2047 in a 2018 GMC Sierra?

The cost of repairing code P2047 in a 2018 GMC Sierra can vary depending on the cause of the issue, parts needed for repair, and labor costs. It is recommended to obtain quotes from reputable repair shops for an accurate estimate.

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