AutoCodes – GMC – P1049 2017 GMC Sierra

P1049 2017 GMC Sierra Code - Reductant Injector High Control Circuit High Voltage

Quick Answer

The Reductant Injector is a component of selective catalytic reduction system used to dose the reductant fluid to the exhaust gas and participate in the reduction reactions. Common causes include Faulty Reductant Injector, Reductant Injector harness is open or shorted, Reductant Injector circuit poor electrical connection. 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: P1049 2017 GMC Sierra indicates Reductant Injector High Control Circuit High Voltage.
Common causes: Common causes include Faulty Reductant Injector, Reductant Injector harness is open or shorted, Reductant Injector circuit poor electrical connection.
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.

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Code Popularity 205

How popular is this code, among other codes? Low

Repair Importance Level

Urgent (Diagnose now) (3 / 3)

Repair Difficulty Level

Advanced (Pro) (3 / 3)

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Table of contents Created and updated by William Orellana on Oct 01, 2022

Description
Possible Causes
How To Fix
Tech Notes ▶
Cost to Diagnose
FAQs
Comments
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Code P1049 2017 GMC Sierra Description

The Reductant Injector is a component of selective catalytic reduction system used to dose the reductant fluid to the exhaust gas and participate in the reduction reactions. The Engine Control Module (ECM) calculates the injection time of the reductant injector based on the measurement of the NOx sensors. To activate the injector the ECM supplies a PWM signal to the high control circuit and the low control circuit is always commanded ON. The Diagnostic Trouble Code (DTC) will be set when the Reductant Control Module detects a short to voltage in the high control circuit.

OBDII Code P1049 2017 GMC Sierra - Reductant Injector High Control Circuit High Voltage - AutoCodes.com — P1049 2017 GMC Sierra Code - Reductant Injector High Control Circuit High Voltage

What does this mean?

What are the Possible Causes of the DTC P1049 2017 GMC Sierra?

Faulty Reductant Injector
Reductant Injector harness is open or shorted
Reductant Injector circuit poor electrical connection
Faulty Engine Control Module (ECM)

How to Fix the DTC P1049 2017 GMC Sierra?

Review the 'Possible Causes' above and visually examine the corresponding wiring harness and connectors. Check for damaged components and inspect connector pins for signs of being broken, bent, pushed out, or corroded.

What does this mean?

Code Tech Notes

User Submitted Video

What is the Cost to Diagnose the Code?

Labor: 1.0

To diagnose the P1049 2017 GMC Sierra code, it typically requires 1.0 hour of labor. Rates vary by location, vehicle, and shop. Many shops charge between $80–$150 per hour; dealerships and metro areas may be higher, independents may be lower.

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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 P1049 2017 GMC Sierra Code

1. What does OBDII code P1049 mean on a 2017 GMC Sierra?

Code P1049 indicates a "Reductant Injector High Control Circuit High Voltage," meaning there is an electrical issue with the reductant injector circuit in the diesel exhaust aftertreatment system.

2. What are the symptoms of code P1049 on a 2017 GMC Sierra?

Common symptoms include an illuminated Check Engine Light, reduced engine performance, poor DEF (diesel exhaust fluid) system function, and possible activation of limp mode.

3. What causes the P1049 code on a 2017 GMC Sierra?

Potential causes include a faulty reductant injector, damaged wiring or connectors in the injector circuit, a defective reductant injector control module, or a short circuit causing excess voltage.

4. Can a bad reductant injector cause code P1049?

Yes, a malfunctioning reductant injector can trigger code P1049 if it fails to operate correctly or sends incorrect voltage signals to the control module.

5. How do I diagnose code P1049 on a 2017 GMC Sierra?

Start by inspecting the wiring and connectors for damage or corrosion. Use a multimeter to check for proper voltage and continuity in the reductant injector circuit. If necessary, scan the reductant module for additional related codes.

6. Can I drive my 2017 GMC Sierra with code P1049?

Driving with code P1049 is not recommended, as it may lead to reduced engine performance, potential damage to the aftertreatment system, and non-compliance with emissions regulations.

7. How do I fix code P1049 on a 2017 GMC Sierra?

Repairs may involve replacing the reductant injector, repairing damaged wiring or connectors, or replacing the reductant control module if it is found to be defective.

8. How much does it cost to fix code P1049 on a 2017 GMC Sierra?

Repair costs can vary widely depending on the issue but may range from $200 to $1,000, including parts and labor, depending on whether the injector, wiring, or control module needs replacement.

9. Can a software update fix code P1049 on a 2017 GMC Sierra?

In some cases, a software update for the engine control module or reductant control module may resolve the issue if the problem is related to incorrect programming.

10. Does code P1049 always require parts replacement?

Not always. Sometimes, cleaning corroded connectors or repairing damaged wiring can resolve the issue without replacing major components. Proper diagnosis is essential.