AutoCodes – GMC – P1049 GMC

P1049 GMC 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 GMC 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 2,012

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

What does this mean?

What are the Possible Causes of the DTC P1049 GMC?

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 GMC?

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 GMC 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.

Need more information about the P1049 GMC code?

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Need Help with the Code?

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Information for Specific GMC Models

P1049 2014 GMC Sierra — Reductant Injector High Control Circuit High Voltage
P1049 2015 GMC Sierra — Reductant Injector High Control Circuit High Voltage
P1049 2016 GMC Sierra — Reductant Injector High Control Circuit High Voltage
P1049 2017 GMC Sierra — Reductant Injector High Control Circuit High Voltage
P1049 2018 GMC Sierra — Reductant Injector High Control Circuit High Voltage

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 GMC Code

1. What are the common symptoms of OBDII code P1049 GMC (Reductant Injector High Control Circuit High Voltage)?

The common symptoms include the Check Engine Light illuminating, reduced engine performance, and potentially increased fuel consumption.

2. What could cause the OBDII code P1049 GMC to trigger?

This code is typically triggered by issues such as a faulty reductant injector, wiring problems in the control circuit, or a malfunctioning powertrain control module (PCM).

3. How serious is the P1049 GMC code?

While the severity can vary, it is generally recommended to address this code promptly to prevent potential damage to the vehicle's emissions system and ensure optimal engine performance.

4. Can I still drive my vehicle with the P1049 GMC code present?

It is generally not recommended to drive the vehicle extensively with this code present, as it can lead to reduced engine efficiency and potential emissions issues.

5. How can I diagnose the cause of the P1049 GMC code?

Diagnosing this code typically involves using an OBDII scanner to retrieve the specific fault codes, conducting a visual inspection of the reductant injector and related wiring, and performing electrical tests to pinpoint the issue.

6. What are some repair tips for addressing the P1049 GMC code?

Repair tips may include replacing the faulty reductant injector, repairing or replacing damaged wiring in the control circuit, and ensuring proper connection and communication with the PCM.

7. Can I reset the P1049 GMC code on my own?

While you can clear the code with an OBDII scanner, it is important to first diagnose and address the underlying issue to prevent the code from reoccurring.

8. How much does it typically cost to repair the P1049 GMC code?

The cost of repairs can vary depending on the specific issue causing the code, but it may involve expenses for parts, labor, and diagnosis by a qualified mechanic.

9. Are there any recalls or technical service bulletins related to the P1049 GMC code?

It is advisable to check with GMC or consult online resources to see if there are any relevant recalls or technical service bulletins related to this specific OBDII code.

10. How can I prevent the P1049 GMC code from reoccurring in the future?

Regular vehicle maintenance, including checking and maintaining the reductant system components, can help prevent the recurrence of the P1049 GMC code.