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P2049 2017 GMC Sierra Code - Reductant Injector Control Circuit High Voltage

Quick Answer

The P2049 diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the Reductant Injector Control Circuit High Voltage. Common causes include Faulty Reductant Injector: A malfunctioning reductant injector can cause high voltage in the control circuit, Wiring Issues: Damaged or corroded wiring in the control circuit can lead to high voltage readings, ECM/PCM Malfunction: A problem with the engine control module (ECM) or powertrain control module (PCM) can also 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 2017 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 in the control circuit, Wiring Issues: Damaged or corroded wiring in the control circuit can lead to high voltage readings, ECM/PCM Malfunction: A problem with the engine control module (ECM) or powertrain control module (PCM) can also 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 14, 2024
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Code P2049 2017 GMC Sierra Description

The P2049 diagnostic trouble code (DTC) for a 2017 GMC Sierra relates to the Reductant Injector Control Circuit High Voltage. This code indicates that there is a high voltage condition detected in the control circuit of the reductant injector system. The reductant injector is a component of the selective catalytic reduction (SCR) system, which is responsible for reducing harmful emissions in the vehicle's exhaust gases. The reductant injector injects a urea-based solution (DEF - Diesel Exhaust Fluid) into the exhaust stream to convert nitrogen oxides (NOx) into harmless nitrogen and water vapor.

OBDII Code P2049 2017 GMC Sierra - Reductant Injector Control Circuit High Voltage
P2049 2017 GMC Sierra Code - Reductant Injector Control Circuit High Voltage

Common Causes of P2049 2017 GMC Sierra

  1. Faulty Reductant Injector: A malfunctioning reductant injector can cause high voltage in the control circuit.
  2. Wiring Issues: Damaged or corroded wiring in the control circuit can lead to high voltage readings.
  3. ECM/PCM Malfunction: A problem with the engine control module (ECM) or powertrain control module (PCM) can also trigger this code.
  4. Poor Quality DEF: The use of low-quality or contaminated DEF can cause issues with the reductant injector system.
  5. Environmental Factors: Extreme temperatures or exposure to water can also contribute to high voltage in the control circuit.

Symptoms of P2049 2017 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 Fuel Efficiency: High voltage in the reductant injector control circuit can lead to poor fuel efficiency as the SCR system may not be operating efficiently.
  3. Increased Emissions: The vehicle may produce higher emissions than usual due to the malfunctioning reductant injector.
  4. Engine Misfires: In some cases, a high voltage condition in the reductant injector control circuit can cause engine misfires or rough idling.

How to Fix P2049 2017 GMC Sierra

  1. Diagnose the Issue: Use a scan tool to retrieve the DTC and perform a thorough inspection of the reductant injector system.
  2. Test the Reductant Injector: Check the reductant injector for proper operation and replace if necessary.
  3. Inspect Wiring: Inspect the wiring harness for any damage or corrosion and repair or replace as needed.
  4. Check ECM/PCM: Ensure that the ECM/PCM is functioning correctly and reprogram or replace if necessary.
  5. Refill DEF: If the issue was caused by poor quality DEF, drain the system and refill with a high-quality DEF.

Cost to Fix P2049 2017 GMC Sierra

The typical repair costs for addressing a P2049 code on a 2017 GMC Sierra can range from $200 to $500, including parts and labor. However, it's important to note that specific diagnosis time and labor rates at auto repair shops can vary based on factors such as location, vehicle make and model, and engine type. Auto repair shops commonly charge between $80 and $150 per hour for labor, with rates potentially higher in metropolitan areas or at dealerships, and lower at independent shops. It's advisable to check local rates for a more accurate estimate.

What does this mean?

Tech Notes for P2049 2017 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 2017 GMC Sierra Code

1. What does the OBDII code P2049 mean on a 2017 GMC Sierra?

P2049 indicates a "Reductant Injector Control Circuit High Voltage," meaning the powertrain control module (PCM) has detected an issue with the reductant injector circuit, such as excessive voltage.

2. What are the common symptoms of code P2049 on a 2017 GMC Sierra?

Common symptoms include the check engine light turning on, poor fuel efficiency, reduced engine power, and potential issues with the diesel exhaust fluid (DEF) system.

3. What causes the P2049 code to appear on a 2017 GMC Sierra?

Possible causes include a faulty reductant injector, damaged wiring or connectors in the reductant injector circuit, a failed PCM, or issues with the DEF system.

4. How do you diagnose the P2049 code on a 2017 GMC Sierra?

Diagnosis involves scanning for codes, visually inspecting the reductant injector circuit wiring and connectors for damage, testing the injector for proper function, and checking the PCM for faults.

5. Can I drive my 2017 GMC Sierra with the P2049 code?

Driving with this code is not recommended as it may lead to reduced engine performance and further damage to the exhaust or emissions system.

6. How do you fix the P2049 code on a 2017 GMC Sierra?

Repairs may include replacing the reductant injector, repairing or replacing damaged wiring or connectors, or reprogramming or replacing the PCM if necessary.

7. How much does it cost to fix the P2049 code on a 2017 GMC Sierra?

The cost varies depending on the specific issue, but repairs typically range from $150 to $600, including parts and labor for wiring repairs or injector replacement.

8. Can a bad DEF system cause the P2049 code?

Yes, a malfunctioning DEF system, including issues with the reductant injector, can trigger this code.

9. Will clearing the P2049 code fix the issue?

Clearing the code will remove it temporarily but won’t address the underlying problem causing the high voltage in the reductant injector circuit.

10. Is the P2049 code covered under warranty for a 2017 GMC Sierra?

It may be covered under the emissions system warranty, but you should check with your GMC dealer for specific coverage details.

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