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P2049 2016 GMC Sierra Code - Reductant Injector Control Circuit High Voltage

Quick Answer

The P2049 diagnostic trouble code (DTC) for a 2016 GMC Sierra refers to a "Reductant Injector Control Circuit High Voltage" issue. Common causes include Faulty Reductant Injector: A malfunctioning reductant injector can cause high voltage issues within the control circuit, Wiring Issues: Damage or corrosion in the wiring connecting the reductant injector to the control module can lead to high voltage readings, Faulty Control Module: A defective control module responsible for managing the reductant injector operation can trigger this code. 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
P2049 2016 GMC Sierra indicates Reductant Injector Control Circuit High Voltage.
Common causes
Common causes include Faulty Reductant Injector: A malfunctioning reductant injector can cause high voltage issues within the control circuit, Wiring Issues: Damage or corrosion in the wiring connecting the reductant injector to the control module can lead to high voltage readings, Faulty Control Module: A defective control module responsible for managing the reductant injector operation can trigger this code.
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 10, 2024
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Code P2049 2016 GMC Sierra Description

The P2049 diagnostic trouble code (DTC) for a 2016 GMC Sierra refers to a "Reductant Injector Control Circuit High Voltage" issue. In vehicles equipped with a Selective Catalytic Reduction (SCR) system, such as the GMC Sierra, the reductant injector is responsible for injecting a urea-based solution into the exhaust stream to reduce harmful nitrogen oxide emissions. The reductant injector control circuit manages the operation of this injector to ensure proper emission control.

OBDII Code P2049 2016 GMC Sierra - Reductant Injector Control Circuit High Voltage
P2049 2016 GMC Sierra Code - Reductant Injector Control Circuit High Voltage

Common Causes of P2049 2016 GMC Sierra

  1. Faulty Reductant Injector: A malfunctioning reductant injector can cause high voltage issues within the control circuit.
  2. Wiring Issues: Damage or corrosion in the wiring connecting the reductant injector to the control module can lead to high voltage readings.
  3. Faulty Control Module: A defective control module responsible for managing the reductant injector operation can trigger this code.
  4. Poor Electrical Connection: Loose or poor electrical connections within the control circuit can cause voltage spikes and trigger the code.
  5. Exhaust System Contamination: Contaminants in the exhaust system can affect the reductant injector's performance and lead to high voltage issues.

Symptoms of P2049 2016 GMC Sierra

  1. Check Engine Light: The most common symptom associated with this code is the illumination of the check engine light on the vehicle's dashboard.
  2. Reduced Power: The vehicle may experience a loss of power or reduced acceleration due to the improper functioning of the reductant injector.
  3. Increased Emissions: In some cases, the vehicle may produce higher emissions than usual, which can be detected during emissions testing.
  4. Poor Fuel Efficiency: A malfunctioning reductant injector control circuit can also lead to decreased fuel efficiency as the SCR system may not be operating optimally.

How to Fix P2049 2016 GMC Sierra

  1. Diagnose the Issue: Use a diagnostic scanner to retrieve the specific trouble code and further diagnose the root cause of the high voltage condition.
  2. Inspect Wiring and Connections: Check the wiring harness, connectors, and terminals for any damage, corrosion, or loose connections. Repair or replace as needed.
  3. Test Reductant Injector: Test the reductant injector's functionality to ensure it is operating within specifications. Replace if necessary.
  4. Check Control Module: Test the control module for proper operation and replace if found to be faulty.
  5. Clear Codes and Test Drive: Clear the diagnostic trouble codes from the vehicle's computer, then test drive the vehicle to verify that the issue has been resolved.

Cost to Fix P2049 2016 GMC Sierra

The cost of repairing a P2049 code on a 2016 GMC Sierra can vary depending on the extent of the issue and the specific components that need to be replaced. In general, the cost of parts for a reductant injector control circuit high voltage issue can range from $200 to $500, with labor costs adding an additional $100 to $300. Therefore, the total repair cost for this issue may fall between $300 and $800. It's important to note that diagnostic time and labor rates can vary between auto repair shops, so it's advisable to consult with a professional technician for a more accurate estimate based on your location and vehicle specifics.

What does this mean?

Tech Notes for P2049 2016 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 P2049 2016 GMC Sierra Code

1. What are the common symptoms of OBDII code P2049 (Reductant Injector Control Circuit High Voltage) in a 2016 GMC Sierra?

- Common symptoms include reduced engine performance, decreased fuel efficiency, and the illumination of the check engine light.

2. What are the possible causes of OBDII code P2049 in a 2016 GMC Sierra?

- The code P2049 can be triggered by issues such as a faulty reductant injector, wiring problems in the injector circuit, or a malfunction in the powertrain control module.

3. How can I diagnose OBDII code P2049 in my 2016 GMC Sierra?

- Diagnosis typically involves using an OBDII scanner to retrieve the trouble codes, conducting a visual inspection of the injector and its wiring, and performing tests to check the injector's resistance and operation.

4. What are some repair tips for resolving OBDII code P2049 in a 2016 GMC Sierra?

- Repair may involve replacing the faulty reductant injector, repairing any damaged wiring in the circuit, or reprogramming the powertrain control module if necessary.

5. Can driving with OBDII code P2049 in a 2016 GMC Sierra cause further damage to the vehicle?

- Continued driving with P2049 can potentially lead to increased emissions, reduced engine efficiency, and potential damage to the catalytic converter over time.

6. How much does it typically cost to repair OBDII code P2049 in a 2016 GMC Sierra?

- The cost of repair can vary depending on the exact cause of the issue, but it may range from $200 to $600, including parts and labor.

7. Is it safe to continue driving my 2016 GMC Sierra with OBDII code P2049?

- While the vehicle may still be operable, it is recommended to address the issue promptly to prevent potential long-term damage and ensure optimal engine performance.

8. Can OBDII code P2049 in a 2016 GMC Sierra be fixed at home, or does it require professional assistance?

- Depending on your automotive repair skills and access to tools, some DIY enthusiasts may be able to address the issue themselves. However, due to the complexity of the system, professional assistance is often recommended.

9. Are there any recalls or technical service bulletins related to OBDII code P2049 in a 2016 GMC Sierra?

- It's advisable to check with the manufacturer or authorized service centers for any related recalls or technical service bulletins that may apply to your specific vehicle.

10. How can I prevent OBDII code P2049 from recurring in my 2016 GMC Sierra after repair?

- Regular maintenance, such as keeping up with scheduled services, addressing any check engine light promptly, and ensuring proper care of the vehicle's emission control system, can help prevent the reoccurrence of OBDII code P2049.

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